Haha, love the conclusion: "It's not brush-LESS because, of course, it's not slathered with brushless lables on there so it's gotta be a brushed DC motor."
Back in the early 80's, I was working on analog to digital converters and had out fitted my 63 econoline van with an electronic cruse control computer plus! About two years after the install, I was going down the road and honked my horn at a friend by the side of the road. Well, the throttle went to the floor and off I went. I shut the van off to get it to stop. When I started it, again the throttle went to the floor! Turns out when I honked the horn, the coil in the horn relay spiked the computer and shorted out the driver for the cruse computer ... Comp u Cruse. I should have put a diode backwards across the horn relay. For the last 30+ years, I have been a pinball game mechanic and there is a diode on almost every coil in the machine. Then the games start acting funny, the first thing I check for are fractured leads on the diodes.
Pro Tip for those with destructo and remanufacturing tendencies: Before throwing away cheapo incandescent or halogen lamps, take off the fiberglass heat protection tubing and store in one of the many 'where the hell did I put that' chaos holding containers.
I have had that rotary tool for years. I love it my only complaint is after awhile the housing around the shaft bearing gets loose but nothing some shim stock can't take care of. AVE I absolutely love your videos as a toolmaker myself your my type of funny! Keep up the good fight
I got one of these last week after the dreadful Proxxon lasted 20mins before dying. The little Milwaukee is pretty awesome. Great analysis and breakdown, thank you
The diode is to prevent reverse current. The motor is an inductive load, so when you switch it off, the magnetic field colapses and can create hundreds of volts which can destroy the mosfet. Sometime, the mosfets have an intergrated diode but it looks like this one doesn't :)
Thing is the kind of engineering AvE does is more that of the handsomely paid glorified field tech. But we all love how he puts it there for us laymen. Shame it doesn't make it back to the design side. I suppose thats because field tech types don't put up with office B.S. and if stuff was made skookum as frig, bean counters wouldn't like what it does to sales of replacement units.
Yes mosfets have diodes inside but they are a byproduct of the way mosfets are built. Usually these diodes don't have great performance and if you let that diode do the work the inductive kickback makes its way back to the power source (Like you might blow up the rest of the circuitry if you removed the battery while it was running)
For us plebs out there that know very little I'd love to see you do a video on different kinds of motors. I see you talk about brush motors, brushless motors, etc. I'd love to see a video where you have a bunch laid out, tear them apart and explain how they work. The pros and cons of each and the best uses for each kind.
Dremel used to be good. I have a plug-in variable speed unit I got as a kid way back in '73 that's still going strong. Used to use it for hobby work back then, but use it for a lot of stuff now: carbide grinding bits, metal cutoff wheels etc.. Also got this Milwaukee unit and it's pretty good. Works well for quick jobs where you don't want to hassle with a cord and all.
in here fish eater countries samurai is usually known as the WORST dirt bike in existence. good to know that when you hear the word "samurai" as in vehicle you don't need to be afraid of your life.
same here, im only 12 and i own two. one im using for parts, and the other i want to turbo when im done with school. I'm thinking about dropping at 14 to deliver, i think i'd be fulfilled in life.
I think most people watching this will appreciate it: on MOSFETs, from left to right with the markings readably facing you: God Damn Semiconductors, or Gate, Drain, Source. Your center pin and tab are always the Drain. Works for the little MOSFETs too!
Hey AvE, due to binge watchin your vidjeos i was able to fix the pixie path on the good womans oven (she let some smoke out). 100 Aussie Pesos later for a part and I saved myself over 3,000! You got any idea how many Bloody Beers that is.
I like watching your videos. I always liked the show how it's made but they never took stuff apart. I also appreciate that if you get something wrong you go back and explain it and show it in a way we can understand. The drill dr was a hoot. My dad had a box of drill bits he saved for years and years. he purchased a jig for a 6 inch bench grinder and said here you go there is over 100 drill bit all need sharpening. Well the jig he bought I just couldn't get to work right. I ended up learning to do them freehand and after a while I got pretty good at it. I did buy a drill Dr., and it is different then the one you had, mine worked very well so much that the shop purchased one for all to use. I never had to replace the grinding wheel and they shop one went several years and they didn't need to replace there's either. Keep the videos coming.
This is actually one of my fave in a while as to what I'd consider AvE is best at. That is, Even when you did the "for newbs" vid just a bit ago, you tend to slide into some topics that might not be best explained at that level, but This one show a great balance of Tech know and dumb'n down for the masses. Once again killin' with a fun watch!
you ain't kidden about the tenitus. wow that joker is frequency perfect. but still not as bad as sheetrockers running cut out drillamagiggers against steel studs. holy freaking cow , that's the sound inside the gates of hell👹
Interesting comment about the DC motor..... about 30 years ago I bought a mains voltage Dremel and a friend overloaded it and burned it out. As we were using it to clean out cracks in horses' feet it worked pretty hard. I replace the original motor with a Mabuchi permanent magnet DC motor so we could run it off the 12v truck battery. It was a LOT more powerful than the original and eventually we just wore that little motor out. Must replace it one day.... it was a stonker. In the workshop I ran it off a tap from the Mig Welder (I think I have the world's only Mig welder with a built-in cigarette lighter socket!).... I presently have a Japanese knock-off of the mains (240v ac) Dremel, and I have used it a lot over the last 20 years. So far it's chugging along fine as I am much less heavy handed with power tools than my ex business partner...
Personally find having a Dremel nearly indispensable for automotive work. I end up using cut off wheels on bolts, plastic parts, and even for cutting bearing races all the time. Much more precise and actually faster than using a massive cutting disc on a grinder. Plus it definitely saves the ear holes some abuse and can get into really tight spots.
AvE, have you ever considered reviewing two copies of the exact same tool bought from the same store at the same time? It may be an interesting concept to compare the two identical tools next to each other, that way you could see if you got a "lemon", or if in fact most every De-Wart, Mil-sucky and Rah-geed tool is completely void of skookum-ness.
Motor prob. has a _lot_ of inductance, so higher freq. chopping will not be that efficient (motor acts like a low pass filter). Agree tho that it's super annoying. would not buy.
That and most of the losses in the transistor occur during switching. So higher carrier frequency means more on/off per second means more pixies heating things up per second. The inductance btw. is what makes this thing even work. As long as the power supply (the battery) can provide enough voltage, more inductance is better. The low pass filtering is avoided by using a free-wheeling diode in parallel with the motor windings. Basically: High switching frequencies are possible, but require really expensive high-end transistors. So they just don't do it.
.... and they can save even more money by having to buy fewer of the low end transistors because fewer people will buy the tool when they find out about the annoying noise. Sounds like great logic to me. Some kind of pixie logic no doubt.
Fred Flintstone If you're buying a cheap tool, you won't complain about the sounds it makes. High-end inverters use much higher switching frequencies, but the transistors that are the most efficient at those high frequencies are just really expensive.
Never been a fan of Dremel tools, BUT just bought this one and I gotta say when you break a tap in hardened steel threads it saved my butt! Great review man thank!
flyback diode is really common when relays are used for the same reason, I think was big clive had a video on it; if you use a led in place of the diode you get a visual representation of the spike:P
I got one of these a few months ago and it's an incredible tool with tons of power. Put a good bur on it and it tears through steel like nothing. With your diode story, you're supposed to put a resistor in series with the diode, and that limits the current created by that inductive kickback. If you just put a diode with no resistor, the diode will burn out very quickly.
18:20 As my govt contractor buddies say, it doesn't have to be good--just good enough. (I don't think you want to know what they were referring to, let alone need to know lol.)
Good enough AND its equivalent weight or more in paperwork. I would love to see the building holding the documents for an aircraft carrier. They probably still have to be on paper.
tr0n is correct. Due to this fact, fuck them, go somewhere you want to go. I find that actually does have real world success. They seem to want a man who knows what he wants. Strangely, you being assertive that this is what you desire is what they seem to desire.
I usually pick up Dremels at the local Hock Shop. I generally get them for a song. I have several models both corded and battery. I always use the battery one though.
Those side firing SMD LEDs you mentioned near the end of the video are used in some fancy gamery graphics card lighting PCBs. Just thought you might find that interesting.
Kinda unfortunate that they don't allow you to reverse the motor in this IMO, would be useful if you're using a cut off wheel and want the bulk of the debris sent away from you regardless of how you're holding it.
i agree completely. i have trouble with the debri getting into my eyes, hair, and mouth. i have a dremmel 3000. but not one of those new ones with the chip board at the back. and i had to get to the tirac chip on the speed control to clean it cause it would skip to full power. and now it doesnt fit right together anymore. the rotor grinds against the other bit now. send help. its misaligned now :(
just add a simple h block between motor and board. plus the required push/hold switch to engage direction. super easy.... But is there room in the case?
Yet another great teardown. Love the depth of info you provide, and the commode-ian commentary helps to pass the time. The diode info was especially helpful for me on a separate problem. Thanks.
Here's my shitty hypothesis as for why that cut out is there on the casting. Perhaps it's a little blow off port. Say your batter blows the smoke out and it needs somewhere to go. If it lets out the top the thing will shoot off like a rocket ship. Instead, it gets released into the pcb area where it has ventilation so it can safely release the pressure without rocket ship grenading into your scrotimus maximus. Just my guess. Who knows.
Yeah, I thought it might be there for air flow reasons too. But it looks pretty dodgy as far as those kinds of reasons go. They could have come up with a design intentionally that looks a little better. Hence the inherent doubt that there was intent behind that at all... It was my first thought too though, "Maybe...".
I mean I get that it's ugly, but it's not exactly a visible part unless you got the battery out. No real point in putting holes in a casting as that makes it more expensive to clean n' machine, so why not just some basic right angley bits. But yeah. It's a maybe. I figure if my robo-penis vape-a-ma-tron 9000 has vent holes, other battery things of similar wattage might as well too.
It looks to me like that can't be a mistake. Someone would have to go out of their way to build that notch in the CAD model. Is it not some kind of relief for a matching notch on the battery or something?
Great video +AvE The cutout near the battery terminals could be for a ribbon cable from the debug/programming header on the board, maybe you could try sticking a header on the 6 pin blank spot and running it to a serial terminal program, could be some debug info flying past, like temp, rpm, current, voltage for testing returned units and pre manufacture testing.
Schottky diode is either used placed in parallel with a MOSFET (body diode is slow and may have a pretty high voltage drop and may create BJT parasitic) or it may be used as part of buck or boost or buck-boost converter. Since it's a very large diode I assume it's on the main current path, i.e. it's probably a boost diode.
No. What would the need a boost converter for? Also there's no inductor for that. My guess is that they use the second MOSFET as a switchable freewheeling "diode". I don't know what current the motor draws, but considering they picked 200A continuous current MOSFETs it will be quite alot. When switching off, the freewheling diode will have to take the full motor current. Even a Schottky diode can have quite a substantial forward voltage at high currents. Times that by the current and you easily get to a point where the diode will have to dissipate a hundred Watts every time the PWM switches off the motor. The on resistance of the MOSFET on the other hand is a few mOhms (and they still mounted it on a heat sink).
PWM control of a DC motor is basically a buck converter, sticking a mosfet across the flyback diode get you to a synchronous buck so you don't have the loss from the diode voltage
superdau There could be several reasons: 1) There is no feedback sensor on that motor and battery voltage drops with drain. So either you have to account for battery voltage and current in calculating duty cycle necessary or you use a boost to prop up voltage to a specific value and keep it there. 2) Higher voltage -> smaller current -> less plated copper, thinner wires and less conductive heating. It makes sense to boost voltage near beefy battery connectors to drop the current down the line. MOSFET current rating does not indicate the actual current used. They may have picked them for spike currents only and I doubts it's higher than 50A avg. But beefier MOSFETs are also slower, so that would explain a Schottky. MOSFET is not a replacement for a Schottky - the body diode is waaaay too slow and you'll need to actively drive the gate with voltage sensor, i.e. you need an active rectifier. That seems like a lot of work.
the drive for the second fet is simple, the controller just toggles between turning the two fets on, the diode handles the small dead time between the two fets being on
Toggling the two FETs at large currents requires a gate driver both charging and discharging each gate. And the larger the MOSFET the larger the gate capacitance, so you'd need a beefy driver at each. You might be right about dead time.
Thanks for turning the bigger one over subtly. For those who're willing to go scrounging for a Suzuki Samurai with a 454 either to add to the Willfuckye or to avoid it completely because Tim Taylor's your beloved role model, the big one's a Makita 906H 1/4 inch die grinder. Hope I'm not getting you into trouble with that, AvE.
I bet that mystery cutout was done during prototyping. There's a lot of air pressure in there from the fan and the vent would draw air throughout the tool. They probably saw the cooling needed a more venting and that was an easy spot to cut out.
I've had one of these for years. it really does make a racquet, but it is great for on the fly chainsaw sharpening. Got a cheap set of attachment bits to play with and then have to go find the quality ones if I want to use it for more than 2 seconds. I use it for all kinds of other chores like polishing metals and plastic and etching glass it does wonders. Usually wind up using the "2 or 3" setting because it does have a relatively strong motor for my needs.
+inthefade we go through tools quite quick. I would take them and send them but I'm skint. UK to Canada shipping ain't cheap. the Chargers go Kaput quite quick~100-200 cycles. the battery drills last~ 6-12months with a couple of brush changes.
The pot is only numbered for personal reference. If, on this tool, you find that 5 works best for a certain job or maybe 2, you can preset it. Convient in some semi-production applications.
i bought one of these because i had great danes and lugging out the corded dremel to trim their nails was a pita. the carrier frequency is not nearly as loud as AvE's camera mic makes it sound but its definitely there.
The wife said you had a cool ruler and I got to say... Not bad!!! Lol keep up the videos and I'm glad there is someone like you so show the rest of us little people how things work. Don stop
Tell you what, for a gunsmith a Dremel is one of the biggest time savers in our shop as well as one thing that always gets us work when homegamers decide to go dremeling things off of their guns.
I have a Dremel 3000(corded and continuously variable speed) very smooth and it doesn't make that whine. Tried a black&decker(half the price of dremel) had enough run-out to cause a lot of vibration and noise, probably would have damaged bits, returned it straight away. I would have got a die grinder but I didn't need the power and couldn't have the noise(using it to round off sharp animal claws and beaks, work great on my toenails too, 180grit sanding drum medium speed short cuts.[long passes get hot])
Because he lives in the middle of no-where Canada and trees don't have the a WIFI signal, so he has to pull out his sled dogs and mush his way to the nearest paved road, then hitch hike to the closest McDonald's to use their WIFI to upload his videos, and even then it probably takes 12 hours to upload it.
Mike Stromecki OMG this is a historic day, another CanadEHn has found this video, which happens to have been made by another CanadEhn. The odds of such a thing happening, which until now have been believed to be astronomically impossible. Just a few examples of the overwhelming challenges that had to be overcome to make this miracle possible, you have somehow despite being separated by 1,000's and 1,000's of miles (oops i mean millions upon millions of kilometers) of nothing but vast frozen ancient pine tree forests. Despite you being buried under 100's of feet (oops i mean 50 meters) of snow. Have miraculously managed to find another CanadEHn's video. I am impressed to say the least sir, and thank you for allowing me to witness the impossible, well done sir, well done. My one regret is not having used this opportunity to buy a lotto ticket, I would be the wealthiest human to ever live. Oh well maybe next time ;-) :-P :-(
+Robert Willgens People seem to be misunderstanding the issue. UA-cam has always given advertisers the option to opt out of advertising on 'questionable' videos that deal with subjexts like sex, rape, drugs, etc. They do this automatically by looking at the tags and the title of the video, and curse words here also happen to get a video flagged under this category. If less people are willing to advertise on your video, of course you are going to make *less* money off of it. The only reason this is an issue is because of UA-cam's quiet enforcement of it without warning content producers.
+UndeadKieran I'm saying that as far as I know, videos are flagged so that advertisers can opt out of advertising on them only if they contain curse words or controversial subjects in their tags.
10:15 you were mostly right. Lithium batteries should be stored unplugged and at 50% charge for safety and long life. - I also like ammo cans for storage and if you think there could be a fire like with a R/C Battery pack or Samsung S7 then it would be wise to keep a bucket filled with fine dry sand close by. Charging bags are also readily available these days.
@AvE, can you do a video featuring all of the tools you bothered to engrave your own name on? Assumably, those are the ones you don't want to part with - unless those are just more expensive and you don't want to dip into your beer fund to replace.
found this channel through a pbr boys comment section interaction. cant say I would have ever thought watching a dremel being disassembled could be this entertaining or educational. sub'ed
Honestly your videos are amazing, not only are the videos informative but the jokes are too funny. I never seen a UA-camr know so much. Keep up the great work and thanks for the education/comedy
Just an FYI on 'going to 11' the BBC Iplayer which plays back all the BBCs content online (in the UK atleast) does indeed go up to 11. I thought that was classy when i first saw it.
Rotary Tools (""Dremels"") are great for a variety of jobs exactly because they are small and low-torgue and also because they require no air supply. It all depends of what type of workshop each one has. For things like jewelry, modelling, prop making, toy making, etc and even small knives, ""Dremels"" are great. For bigger things ""Dremels"" suck. They will be pushed too hard and overheat in minutes; a Grinder and a Die Grinder are the proper tools for these jobs. (When working on a project, I had to cool down my Dremel by putting it in the refrigerator for 20 min before I could use it again, for 2-3min before it became again too hot to hold. xD)
Unless the control is done in pure analogue, the control is as infinite as the ADC on the processor. Most units usually have 8-12 bit ADC built-in (more than 12 is usually high-end processors or dedicated ADCs), so the "infinite" control is anywhere from 256 to 4096 steps. That's infinite enough for most people, but 10-11 steps is just as good :)
Hey brother, love the vijayos! Small clarification on the voltage spike after switching an inductor. The collapsing magnetic field induces a voltage.... Lenz law and such. It’s called “back EMF”(electro motive force) if memory serves. Stab a capacitor in there and you have a basic boost circuit.
That voltage spike is relatable in hydraulics. Had a piece of equipment that when shut off would just grind to a halt. The damn thing kept blowing motor seals and hoses. The fix was just a simple relief valve. It is interesting To hear that that exists in electronics too.
AvE, those holes in the plastic are the gates from the second mold from a 2 shot mold and injection press. I work with these. Pain in the ass to process.
at 15:30, if I remember it right its called transient voltage, they tend to connect the two contacts by a spark, until the transient voltage runs flat and the spark extinguished. something like a ballast and starter of a fluorescent tube assembly.
I've used this little fella to grind down welds and cut up the floor in a 90s VW. Never thought a dremel could be useful but this thing rips! (don't have air in my work's "shop" and electric die grinders are useless for smaller stuff)
I love mine. I have a 60 gallon compressor and a bunch of air grinders but you can't beat this to carve out an opening for a car stereo or ream out a small hole in a fiberglass boat. It's a handy as hell tool that goes where my air hoses can't.
You know Ave we have dpvs with shark fins on top for our show. The divers tend to feather the magnet switch which kept busting the diodes across the relays which then killed the switch. If only I'd seen this video back then, would have saved some time.
"Irritating as hell"
*proceeds to blast it in our ears for 2 solid minutes*
frother it’s for armchair science.
REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
You watch these without wearing ear defenders? Shame on you.
Haha, love the conclusion: "It's not brush-LESS because, of course, it's not slathered with brushless lables on there so it's gotta be a brushed DC motor."
Back in the early 80's, I was working on analog to digital converters and had out fitted my 63 econoline van with an electronic cruse control computer plus! About two years after the install, I was going down the road and honked my horn at a friend by the side of the road. Well, the throttle went to the floor and off I went. I shut the van off to get it to stop. When I started it, again the throttle went to the floor! Turns out when I honked the horn, the coil in the horn relay spiked the computer and shorted out the driver for the cruse computer ... Comp u Cruse. I should have put a diode backwards across the horn relay. For the last 30+ years, I have been a pinball game mechanic and there is a diode on almost every coil in the machine. Then the games start acting funny, the first thing I check for are fractured leads on the diodes.
Love it
Hey! I'm a pinball fixing dude too and I do exactly the same thing!
Pro Tip for those with destructo and remanufacturing tendencies: Before throwing away cheapo incandescent or halogen lamps, take off the fiberglass heat protection tubing and store in one of the many 'where the hell did I put that' chaos holding containers.
lol aka bottomless pit of a junk droor....
It's only junk when you give up trying to find the missing whatnot.
aka the black holes
incandescent sucks balls though. Compared to led there like gas lamps
I also steal me some SMD resistors while I am there.
"The dorky fella... Matthais Waddle..."
HAHA! Them is Canuck fighting words!
I laughed out loud when he said that.
I love Matthias too
Money shot, right there. Lmaof.
Shots fired! xD
Eco Mouse I heard Canadians handle fights with good ole feathered pillows
0:27
"it's like jamming a 454 four barrel in a suzuki samurai"
Wait, that's not what the Suzuki Samurai is for? Could've fooled me.
I have had that rotary tool for years. I love it my only complaint is after awhile the housing around the shaft bearing gets loose but nothing some shim stock can't take care of. AVE I absolutely love your videos as a toolmaker myself your my type of funny! Keep up the good fight
I got one of these last week after the dreadful Proxxon lasted 20mins before dying. The little Milwaukee is pretty awesome. Great analysis and breakdown, thank you
The diode is to prevent reverse current. The motor is an inductive load, so when you switch it off, the magnetic field colapses and can create hundreds of volts which can destroy the mosfet. Sometime, the mosfets have an intergrated diode but it looks like this one doesn't :)
Yep, I'm sure (because it's a perm magnet motor) it's a reverse EMF protection diode
lol, i know, I comment before xD Doug Anderson
+What's the geek eager beaver. rookie AvE mistake there. this guys has PhDs. and not, that's not a STD
Thing is the kind of engineering AvE does is more that of the handsomely paid glorified field tech. But we all love how he puts it there for us laymen. Shame it doesn't make it back to the design side. I suppose thats because field tech types don't put up with office B.S. and if stuff was made skookum as frig, bean counters wouldn't like what it does to sales of replacement units.
Yes mosfets have diodes inside but they are a byproduct of the way mosfets are built. Usually these diodes don't have great performance and if you let that diode do the work the inductive kickback makes its way back to the power source (Like you might blow up the rest of the circuitry if you removed the battery while it was running)
"way before christ was a cowboy"... it's lines like these that have me tuning in every week...
For us plebs out there that know very little I'd love to see you do a video on different kinds of motors. I see you talk about brush motors, brushless motors, etc. I'd love to see a video where you have a bunch laid out, tear them apart and explain how they work. The pros and cons of each and the best uses for each kind.
Dremel used to be good. I have a plug-in variable speed unit I got as a kid way back in '73 that's still going strong. Used to use it for hobby work back then, but use it for a lot of stuff now: carbide grinding bits, metal cutoff wheels etc.. Also got this Milwaukee unit and it's pretty good. Works well for quick jobs where you don't want to hassle with a cord and all.
it's great to hear a samurai reference best car I've ever owned 10 times
i love my samurai out of the many many vehicles that ive owned its prolly my favorite.
in here fish eater countries samurai is usually known as the WORST dirt bike in existence. good to know that when you hear the word "samurai" as in vehicle you don't need to be afraid of your life.
+DJhartson They're talking about the suv not the dirt bike.....
+Yalvan 88 We have the Samurai's larger sibling, the Tracker/Sidekick in 5 speed and 4x4 form and it is really fun to drive.
same here, im only 12 and i own two. one im using for parts, and the other i want to turbo when im done with school. I'm thinking about dropping at 14 to deliver, i think i'd be fulfilled in life.
I think most people watching this will appreciate it: on MOSFETs, from left to right with the markings readably facing you: God Damn Semiconductors, or Gate, Drain, Source. Your center pin and tab are always the Drain. Works for the little MOSFETs too!
Hey AvE, due to binge watchin your vidjeos i was able to fix the pixie path on the good womans oven (she let some smoke out). 100 Aussie Pesos later for a part and I saved myself over 3,000! You got any idea how many Bloody Beers that is.
that is bad ass
atm thats 500 VB"s
Coalition of Rob, about 7 beers with the ridiculous amount of tax you govt applies.
But did you increase the chooch factor by 7?
1300 xxxx in QLD
I like watching your videos. I always liked the show how it's made but they never took stuff apart. I also appreciate that if you get something wrong you go back and explain it and show it in a way we can understand. The drill dr was a hoot. My dad had a box of drill bits he saved for years and years. he purchased a jig for a 6 inch bench grinder and said here you go there is over 100 drill bit all need sharpening. Well the jig he bought I just couldn't get to work right. I ended up learning to do them freehand and after a while I got pretty good at it. I did buy a drill Dr., and it is different then the one you had, mine worked very well so much that the shop purchased one for all to use. I never had to replace the grinding wheel and they shop one went several years and they didn't need to replace there's either. Keep the videos coming.
If it isn't in the wife's nightstand, it'll be in a low earth orbit.
It's 2:30 AM in the morning on a Saturday, and I'm watching AvE review a tool that I'll almost certainly never buy. What a life!
Glad to see the growth of this channel it's well deserved keep up the good work @AVE
And look at it today.
He’s a brilliant creator of so many types of videos.
This is actually one of my fave in a while as to what I'd consider AvE is best at. That is, Even when you did the "for newbs" vid just a bit ago, you tend to slide into some topics that might not be best explained at that level, but This one show a great balance of Tech know and dumb'n down for the masses. Once again killin' with a fun watch!
perfect freq to trigger my tinnitus, thanks AvE, I'm really going to enjoy the next few hours!
The word "trigger" triggers me.
shiconia, how do you cope with the word moist?
you ain't kidden about the tenitus. wow that joker is frequency perfect. but still not as bad as sheetrockers running cut out drillamagiggers against steel studs. holy freaking cow , that's the sound inside the gates of hell👹
just imagine if you owned that thing and used it irl
Lunas Eclipse
Tools on work tend to make even more noise. That is my irl experience with these sorts of things.
Interesting comment about the DC motor..... about 30 years ago I bought a mains voltage Dremel and a friend overloaded it and burned it out.
As we were using it to clean out cracks in horses' feet it worked pretty hard. I replace the original motor with a Mabuchi permanent magnet DC motor so we could run it off the 12v truck battery. It was a LOT more powerful than the original and eventually we just wore that little motor out.
Must replace it one day.... it was a stonker. In the workshop I ran it off a tap from the Mig Welder (I think I have the world's only Mig welder with a built-in cigarette lighter socket!)....
I presently have a Japanese knock-off of the mains (240v ac) Dremel, and I have used it a lot over the last 20 years. So far it's chugging along fine as I am much less heavy handed with power tools than my ex business partner...
Personally find having a Dremel nearly indispensable for automotive work. I end up using cut off wheels on bolts, plastic parts, and even for cutting bearing races all the time. Much more precise and actually faster than using a massive cutting disc on a grinder. Plus it definitely saves the ear holes some abuse and can get into really tight spots.
I love these videos. Forgot all about this guy, glad I'm back. I'm going to binge watch all of his videos this week.
AvE, have you ever considered reviewing two copies of the exact same tool bought from the same store at the same time? It may be an interesting concept to compare the two identical tools next to each other, that way you could see if you got a "lemon", or if in fact most every De-Wart, Mil-sucky and Rah-geed tool is completely void of skookum-ness.
You have taught me more than I learned in a entire year of high school engineering hahaha. Thanks AvE!
Fuck that noise. Literally. Why the fuck would anyone set a pwm frequency below 20k Hertz?!
Weak gate driver i assume, mosfet gate charge is a bitch
Motor prob. has a _lot_ of inductance, so higher freq. chopping will not be that efficient (motor acts like a low pass filter).
Agree tho that it's super annoying. would not buy.
That and most of the losses in the transistor occur during switching. So higher carrier frequency means more on/off per second means more pixies heating things up per second.
The inductance btw. is what makes this thing even work. As long as the power supply (the battery) can provide enough voltage, more inductance is better. The low pass filtering is avoided by using a free-wheeling diode in parallel with the motor windings.
Basically: High switching frequencies are possible, but require really expensive high-end transistors. So they just don't do it.
.... and they can save even more money by having to buy fewer of the low end transistors because fewer people will buy the tool when they find out about the annoying noise.
Sounds like great logic to me. Some kind of pixie logic no doubt.
Fred Flintstone If you're buying a cheap tool, you won't complain about the sounds it makes. High-end inverters use much higher switching frequencies, but the transistors that are the most efficient at those high frequencies are just really expensive.
The diode is for protecting the mosfet from inductive load voltage spike
I've still got one of those older battery dremels. It really does look like a fancy fishing lure
Never been a fan of Dremel tools, BUT just bought this one and I gotta say when you break a tap in hardened steel threads it saved my butt! Great review man thank!
this is why i love this channel! the explanations of how things works are awesome!
flyback diode is really common when relays are used for the same reason, I think was big clive had a video on it; if you use a led in place of the diode you get a visual representation of the spike:P
14:25 mag field collapses and you essentially get a spark plug. I'm using your water hammer analogy. It's awesome.
I got one of these a few months ago and it's an incredible tool with tons of power. Put a good bur on it and it tears through steel like nothing.
With your diode story, you're supposed to put a resistor in series with the diode, and that limits the current created by that inductive kickback. If you just put a diode with no resistor, the diode will burn out very quickly.
They say AvE will respond if you entice him with a sturdy 5" Makita grinder...
+AvE i need that cnc machine for uh ..... SCIENCE !!!
+AvE You should review the dremel equivalent of this grinder (probably the 4200) and compare the differences/quality of manufacturing.
Great video! I would have liked to have seen inside that motor but I'm sure you want to keep that tool for use.
18:20 As my govt contractor buddies say, it doesn't have to be good--just good enough.
(I don't think you want to know what they were referring to, let alone need to know lol.)
has to be aviation... ask me how i know.
GUNS please let it be guns, Wait fireworks, food, priests.
Good enough AND its equivalent weight or more in paperwork. I would love to see the building holding the documents for an aircraft carrier. They probably still have to be on paper.
this is one of your best videos. very educational. we need people like you as a school teacher.
3900hz is apparently the resonant frequency of the void between my ears. Fuck me that hurts!
pretty sure 2-4 khz is the frequency we hear the best
Old TVs apparently whine at 15625 Hz
19:35 the side-emitting LEDs are neat, they should be 335 SMDs.
They are also used in LED strips, perfect for a super thin light source.
can you go over how to ask a lady where she wants ot eat for dinner? thats a harder issue in my life than any power tool.
you gotta look up the datasheet for the lady in question, should have the proper operating temperatures there.
tr0n is correct. Due to this fact, fuck them, go somewhere you want to go. I find that actually does have real world success. They seem to want a man who knows what he wants. Strangely, you being assertive that this is what you desire is what they seem to desire.
you ask and expect an actual answer? you fool!
If your avatar is accurate, this video might be good for inspiration.
lol bunch of dumbasses cant understand sarcasm, like anyone knows the awnser to that...
I usually pick up Dremels at the local Hock Shop. I generally get them for a song. I have several models both corded and battery. I always use the battery one though.
9:15 - the middle pin / tab of MOSFETS is the *drain*, not the source. Pretty much standard.
PhattyMo It's nice that they stuck with that arrangement both on SMD's as well as through-hole power packages (TO220, TO247 etc)
I memorized GDS, just say it a thousand times in your head... GDS, GDS, GDS, *G* ate *D* rain *S* ource... GDS.
Good Day Sir
Thats first joke about shoving a 454 4 barrle in a samurai really cracked me up and great vid keep them coming
"Hoo-ha rattler" infiltrated your vocabumalary. There's my 15 minutes
Those side firing SMD LEDs you mentioned near the end of the video are used in some fancy gamery graphics card lighting PCBs. Just thought you might find that interesting.
gray box can't help, it says Fakita right on a sticker
what was the point of hiding it back then? He talks about Makita all the time?
I could walk right past you and not even know it but could pick you out of a hand line up 100% of the time! Enjoyed the lesson today, as always.
Kinda unfortunate that they don't allow you to reverse the motor in this IMO, would be useful if you're using a cut off wheel and want the bulk of the debris sent away from you regardless of how you're holding it.
i agree completely. i have trouble with the debri getting into my eyes, hair, and mouth. i have a dremmel 3000. but not one of those new ones with the chip board at the back. and i had to get to the tirac chip on the speed control to clean it cause it would skip to full power. and now it doesnt fit right together anymore. the rotor grinds against the other bit now. send help. its misaligned now :(
just add a simple h block between motor and board. plus the required push/hold switch to engage direction. super easy.... But is there room in the case?
Yet another great teardown. Love the depth of info you provide, and the commode-ian commentary helps to pass the time.
The diode info was especially helpful for me on a separate problem. Thanks.
Here's my shitty hypothesis as for why that cut out is there on the casting. Perhaps it's a little blow off port. Say your batter blows the smoke out and it needs somewhere to go. If it lets out the top the thing will shoot off like a rocket ship. Instead, it gets released into the pcb area where it has ventilation so it can safely release the pressure without rocket ship grenading into your scrotimus maximus.
Just my guess. Who knows.
Yeah, I thought it might be there for air flow reasons too. But it looks pretty dodgy as far as those kinds of reasons go. They could have come up with a design intentionally that looks a little better. Hence the inherent doubt that there was intent behind that at all... It was my first thought too though, "Maybe...".
I mean I get that it's ugly, but it's not exactly a visible part unless you got the battery out. No real point in putting holes in a casting as that makes it more expensive to clean n' machine, so why not just some basic right angley bits.
But yeah. It's a maybe. I figure if my robo-penis vape-a-ma-tron 9000 has vent holes, other battery things of similar wattage might as well too.
It looks to me like that can't be a mistake. Someone would have to go out of their way to build that notch in the CAD model. Is it not some kind of relief for a matching notch on the battery or something?
That's a good point. It could add stability/prevent twisting.
Great video +AvE
The cutout near the battery terminals could be for a ribbon cable from the debug/programming header on the board, maybe you could try sticking a header on the 6 pin blank spot and running it to a serial terminal program, could be some debug info flying past, like temp, rpm, current, voltage for testing returned units and pre manufacture testing.
Schottky diode is either used placed in parallel with a MOSFET (body diode is slow and may have a pretty high voltage drop and may create BJT parasitic) or it may be used as part of buck or boost or buck-boost converter. Since it's a very large diode I assume it's on the main current path, i.e. it's probably a boost diode.
No. What would the need a boost converter for? Also there's no inductor for that.
My guess is that they use the second MOSFET as a switchable freewheeling "diode". I don't know what current the motor draws, but considering they picked 200A continuous current MOSFETs it will be quite alot. When switching off, the freewheling diode will have to take the full motor current. Even a Schottky diode can have quite a substantial forward voltage at high currents. Times that by the current and you easily get to a point where the diode will have to dissipate a hundred Watts every time the PWM switches off the motor. The on resistance of the MOSFET on the other hand is a few mOhms (and they still mounted it on a heat sink).
PWM control of a DC motor is basically a buck converter, sticking a mosfet across the flyback diode get you to a synchronous buck so you don't have the loss from the diode voltage
superdau There could be several reasons:
1) There is no feedback sensor on that motor and battery voltage drops with drain. So either you have to account for battery voltage and current in calculating duty cycle necessary or you use a boost to prop up voltage to a specific value and keep it there.
2) Higher voltage -> smaller current -> less plated copper, thinner wires and less conductive heating. It makes sense to boost voltage near beefy battery connectors to drop the current down the line.
MOSFET current rating does not indicate the actual current used. They may have picked them for spike currents only and I doubts it's higher than 50A avg. But beefier MOSFETs are also slower, so that would explain a Schottky.
MOSFET is not a replacement for a Schottky - the body diode is waaaay too slow and you'll need to actively drive the gate with voltage sensor, i.e. you need an active rectifier. That seems like a lot of work.
the drive for the second fet is simple, the controller just toggles between turning the two fets on, the diode handles the small dead time between the two fets being on
Toggling the two FETs at large currents requires a gate driver both charging and discharging each gate. And the larger the MOSFET the larger the gate capacitance, so you'd need a beefy driver at each. You might be right about dead time.
Thanks for turning the bigger one over subtly. For those who're willing to go scrounging for a Suzuki Samurai with a 454 either to add to the Willfuckye or to avoid it completely because Tim Taylor's your beloved role model, the big one's a Makita 906H 1/4 inch die grinder. Hope I'm not getting you into trouble with that, AvE.
I'm getting a Festool commercial before your videos ^^
Your obtaining a Festool commercial?
That clearly says more about you then us.
You part of the elite
+MorRobots ?
Nope! I don't google over priced wood working tools enough to get pegged by the algorithm..
I bet that mystery cutout was done during prototyping. There's a lot of air pressure in there from the fan and the vent would draw air throughout the tool. They probably saw the cooling needed a more venting and that was an easy spot to cut out.
For the life of me I can't understand why AvE doesn't have a storefront on Amazon/Ebay or somewhere.
I picked up on the small dovetails in the overmould to help hold it to the case too. Really fine details to make sure it wont peel.
7:37 Fiberglass or Canadian Mineral-Wool?!?! Asbestos by another name still smells as sweet ;)
I've had one of these for years. it really does make a racquet, but it is great for on the fly chainsaw sharpening. Got a cheap set of attachment bits to play with and then have to go find the quality ones if I want to use it for more than 2 seconds. I use it for all kinds of other chores like polishing metals and plastic and etching glass it does wonders. Usually wind up using the "2 or 3" setting because it does have a relatively strong motor for my needs.
Have you done Bosch stuff yet? We use that stuff at work and it's alright!
ikr, he's always talking about shit deWalt cordless screwdrivers, but i would like to see him test the blue Bosch 18v line
If someone buys him a Bosch, I'm sure he'll do it.
AvE doesn't get many freebies given to him by manufacturers, for obvious reasons.
i'll get new tools in january, guess i could send him the cordless hammer drill and the normal one
but i dont know yet :D
+inthefade we go through tools quite quick. I would take them and send them but I'm skint. UK to Canada shipping ain't cheap. the Chargers go Kaput quite quick~100-200 cycles. the battery drills last~ 6-12months with a couple of brush changes.
What the hell are you doing to it :O
mine last 2 years until i get new oney anyways :D
The pot is only numbered for personal reference. If, on this tool, you find that 5 works best for a certain job or maybe 2, you can preset it. Convient in some semi-production applications.
I freaking love your videos, and I'm stoked to get that ruler!!!
i bought one of these because i had great danes and lugging out the corded dremel to trim their nails was a pita. the carrier frequency is not nearly as loud as AvE's camera mic makes it sound but its definitely there.
Does it really whine that loud or is that just the camera mic? Sounds annoying as shit
it really is that loud, it works great though.
I have a migraine right now and had to turn the volume down when it was running or I was bleeding out my ears and eyes...
i recoment Ears Audio Tool Kit on google chrome. i use it to deess all of my interconnected tubes.
they really sound just like that, dreadful noise and tool in my opinion I would rather use a rotozip.
Weird. Couldn't they just increase the carrier frequency beyond the audible range?
The wife said you had a cool ruler and I got to say... Not bad!!! Lol keep up the videos and I'm glad there is someone like you so show the rest of us little people how things work. Don stop
first one of your videos I couldn't watch. My friggin ear drums, man!
Tell you what, for a gunsmith a Dremel is one of the biggest time savers in our shop as well as one thing that always gets us work when homegamers decide to go dremeling things off of their guns.
I have a Dremel 3000(corded and continuously variable speed) very smooth and it doesn't make that whine. Tried a black&decker(half the price of dremel) had enough run-out to cause a lot of vibration and noise, probably would have damaged bits, returned it straight away.
I would have got a die grinder but I didn't need the power and couldn't have the noise(using it to round off sharp animal claws and beaks, work great on my toenails too, 180grit sanding drum medium speed short cuts.[long passes get hot])
That carrier frequency is like a nail through the skull.
mate it's 3:00 am on the east coast why do you do this to us
It's midnight on west coast
I thought the same thing
I'm on the east coast, yet I'm confused what he is doing to us?
Because he lives in the middle of no-where Canada and trees don't have the a WIFI signal, so he has to pull out his sled dogs and mush his way to the nearest paved road, then hitch hike to the closest McDonald's to use their WIFI to upload his videos, and even then it probably takes 12 hours to upload it.
Mike Stromecki OMG this is a historic day, another CanadEHn has found this video, which happens to have been made by another CanadEhn. The odds of such a thing happening, which until now have been believed to be astronomically impossible. Just a few examples of the overwhelming challenges that had to be overcome to make this miracle possible, you have somehow despite being separated by 1,000's and 1,000's of miles (oops i mean millions upon millions of kilometers) of nothing but vast frozen ancient pine tree forests. Despite you being buried under 100's of feet (oops i mean 50 meters) of snow. Have miraculously managed to find another CanadEHn's video. I am impressed to say the least sir, and thank you for allowing me to witness the impossible, well done sir, well done. My one regret is not having used this opportunity to buy a lotto ticket, I would be the wealthiest human to ever live. Oh well maybe next time ;-) :-P :-(
been binge watching these vids and this may be the first one that left me thinking the subject tool would be a solid purchase.
I wonder how the new monetary enforcement will effect Ave videos?
Why would anyone *not* want to advertise on Storytime with Uncle AvE?
i dont see what they could do youtube technically has not done anything wrong its their platform they can chose what to monetize and what to not
+Robert Willgens People seem to be misunderstanding the issue. UA-cam has always given advertisers the option to opt out of advertising on 'questionable' videos that deal with subjexts like sex, rape, drugs, etc. They do this automatically by looking at the tags and the title of the video, and curse words here also happen to get a video flagged under this category. If less people are willing to advertise on your video, of course you are going to make *less* money off of it. The only reason this is an issue is because of UA-cam's quiet enforcement of it without warning content producers.
What do you mean?
+UndeadKieran I'm saying that as far as I know, videos are flagged so that advertisers can opt out of advertising on them only if they contain curse words or controversial subjects in their tags.
10:15 you were mostly right. Lithium batteries should be stored unplugged and at 50% charge for safety and long life.
-
I also like ammo cans for storage and if you think there could be a fire like with a R/C Battery pack or Samsung S7 then it would be wise to keep a bucket filled with fine dry sand close by. Charging bags are also readily available these days.
she'll no stand the strain captain
I love how the different manufacturers use pretty much the same motors as well.
Lol that nerds guy, I subbed to his channel about a year ago, he's a pretty fart smella
Sidney Beach as opposed to smart fella? Lol
Milwaukee tools cost a bloody fortune here in the UK!
why hide the Makita dremmel? haven't seen you do that before
+ShadowBanned good thinking. looks like a nice Makita.
It looks like the normal Makita logo to me.
Called "product displacement" technically he can have to pay licensing fees to have their logo in his video if they don't like what he says.
@AvE, can you do a video featuring all of the tools you bothered to engrave your own name on? Assumably, those are the ones you don't want to part with - unless those are just more expensive and you don't want to dip into your beer fund to replace.
Subscribed.
found this channel through a pbr boys comment section interaction. cant say I would have ever thought watching a dremel being disassembled could be this entertaining or educational. sub'ed
Headphone warning! my ears are still ringing hah
That thumbnail made my entire day AvE!
420 views. Time for a dooooobie. :-)
Honestly your videos are amazing, not only are the videos informative but the jokes are too funny. I never seen a UA-camr know so much. Keep up the great work and thanks for the education/comedy
interesting, useful, and funny but I happen to like Matthias he makes good designs
Just an FYI on 'going to 11' the BBC Iplayer which plays back all the BBCs content online (in the UK atleast) does indeed go up to 11. I thought that was classy when i first saw it.
Woah! I hertz my ears!
Rotary Tools (""Dremels"") are great for a variety of jobs exactly because they are small and low-torgue and also because they require no air supply.
It all depends of what type of workshop each one has.
For things like jewelry, modelling, prop making, toy making, etc and even small knives, ""Dremels"" are great.
For bigger things ""Dremels"" suck. They will be pushed too hard and overheat in minutes; a Grinder and a Die Grinder are the proper tools for these jobs.
(When working on a project, I had to cool down my Dremel by putting it in the refrigerator for 20 min before I could use it again, for 2-3min before it became again too hot to hold. xD)
Unless the control is done in pure analogue, the control is as infinite as the ADC on the processor. Most units usually have 8-12 bit ADC built-in (more than 12 is usually high-end processors or dedicated ADCs), so the "infinite" control is anywhere from 256 to 4096 steps. That's infinite enough for most people, but 10-11 steps is just as good :)
Hey brother, love the vijayos! Small clarification on the voltage spike after switching an inductor. The collapsing magnetic field induces a voltage.... Lenz law and such. It’s called “back EMF”(electro motive force) if memory serves. Stab a capacitor in there and you have a basic boost circuit.
Totally fun to watch with headphones on. That whine is just lovely.
That voltage spike is relatable in hydraulics. Had a piece of equipment that when shut off would just grind to a halt. The damn thing kept blowing motor seals and hoses. The fix was just a simple relief valve. It is interesting To hear that that exists in electronics too.
AvE, those holes in the plastic are the gates from the second mold from a 2 shot mold and injection press. I work with these. Pain in the ass to process.
at 15:30, if I remember it right its called transient voltage, they tend to connect the two contacts by a spark, until the transient voltage runs flat and the spark extinguished. something like a ballast and starter of a fluorescent tube assembly.
I have two of these for luthier work. Couldn't be happier with them
I went through two of these in a one year period. Hope Milwaukee will warranty the second broken one.
I've used this little fella to grind down welds and cut up the floor in a 90s VW. Never thought a dremel could be useful but this thing rips!
(don't have air in my work's "shop" and electric die grinders are useless for smaller stuff)
I love mine. I have a 60 gallon compressor and a bunch of air grinders but you can't beat this to carve out an opening for a car stereo or ream out a small hole in a fiberglass boat. It's a handy as hell tool that goes where my air hoses can't.
The shaft looks nice...that’s what she said
You know Ave we have dpvs with shark fins on top for our show. The divers tend to feather the magnet switch which kept busting the diodes across the relays which then killed the switch. If only I'd seen this video back then, would have saved some time.
I saw Matthias' video and immediately thought you would approve of his tool