Відео

The price for the parts runs about $140. The materials were mostly selected to limit the amount of custom work so nearly anyone can build one :)

That was not rude at all! I appreciate hearing it. A while ago I read about vibrators for men with spinal cold injuries that would force ejaculation - the technique is in products like the $900 Ferticare. The same amplitude (4-6mm) & frequency (2-5k hz) can be made with a $20 tattoo gun or electric razor. I've made a few of them with positive feedback. I put the concept here: ua-cam.com/video/DtnMCefC9_w/v-deo.html I started working on a compact design for just a motor with an adjustable amplitude, but other things kept taking priority. I can't say exactly when, but knowing someone is interested , makes me happy to work on it again!

Thank you for letting me know me know! I need to find them, but I’ll upload and update the doc this week.

Because that would have been easy and made too much sense ... I get so fixated sometimes I miss the big picture! This was just one failure after another. I really underestimated the amount of force they make. My first setup was on a wood bench (RIP)

I've been working on measuring / calculating force for awhile... but haven't had the best results. I just put up this - ua-cam.com/video/bf-2tbeEQOE/v-deo.html - which has some good info.

The smallest viable cylinder would be 50x50 - but that doesn't leave much installation flexibility. I definitely prefer the SC50x100.

I have done any testing / calculations with the belt version, however the pulley ratio is nearly 1:1. It will have greater pulling force than the inline version (the design puts too much on the coupler so it comes apart with high pulling loads) . It's not worth much, but this might interest you: ua-cam.com/video/bf-2tbeEQOE/v-deo.html

Definitely. It simply doesn't move enough air. If you watch them on a cow, there's very little movement :/

I thought I'd be able to reply to this with a link to the video, but it's taking me a lot longer than expected :/ I was having problems running it closed loop but just realized it's likely a cable problem! Hopefully by the end of next month!

I don’t have anything to sell currently, but I update the materials on GitHub.com/mikeachines As soon as I have something to sell I’ll definitely post it :)

Ah! Like a telescopic actuator. I looked into this awhile ago and the skills are beyond me. You'd need some type of hollow screw to fit one inside (?) This may help : www.neff-ballscrews.com/products/telescopic-screw-drives

@@nsfwmachines8343 you can try it by 3d printer

There's some benefits to both. My opinion of the rocker arm is that it has some unique benefits (assuming same stepper / servo motor as screw). It's the only design that allows a physical max stroke that can be adjusted mechanically. So, you can set a max stroke on the arm of 4" or 10" or anything, and then adjust anywhere within that on the fly just like a screw. It's the absolutely fastest transmission (if speed matters) because regardless of length, one complete stroke is one revolution. The screws is given in distance per revolution. The downsides are speed comes at the cost of strength, so you're not going to drive it with a Nema17. And calculating actual length requires some math - the distance per step isn't constant in a single revolution.

@@nsfwmachines8343 Makes sense. Thanks for the info. Look forward to seeing more of your builds.

Same. I am like cool engineering youtube then I was like oooh

I'm not sure what you mean by this? A stepper driving a screw is a pretty standard linear mechanism. I probably should have stated the goal more clearly - high speed, low cost, as much off the shelf as possible to make it easy to DIY. No one would be using an electric cylinder to drive a CNC...

@@nsfwmachines8343 I think what he means is the motor shaft bearings are having to take the full axial load. They will only be rated to take a very light axial loads. You need to add in some thrust bearings so the motor bearing don’t die.

@@Wiggleraway OH! Absolutely!!! I've been trying to use different motors for each build, to be somewhat motor agnostic. The one at the start is sort of a novelty - I totally agree. Thanks for the clarification :)

@@nsfwmachines8343 Yes the bearing isn't really appropriate, but that's fine for this sort of DIY, learning is half the point, kind of project. The thing is the lead screw isn't attached to the inner race of the bearing so linear force is carried by the motor and in turn by its bracket which is only designed for torque loading. Under tension loads the coupler will separate. Because you used a really fast thread lead screw there might not be enough force to cause any of these failures but half the folks that replicate your design will substitute threaded rod.

Excellent - and true - points! With the motor inline, the coupler separates before peak force when pulling. Luckily, pulling tends to require significantly less force (in my use case). The screw speed is critical, anything under 20mm lead won't work. Machining the screw from Igus to put a thread on the end takes it from $10 to ~$120. Possibly a FK style bearing mount and a shaft collar could work.

It seems hard to shop for electric cylinders without needing to go through sales agents etc. Do you recommend any?

@@nsfwmachines8343 I can't send you some of the ones that are common. Link and other stuff got deleted.

None of my comments are showing

@@nsfwmachines8343 look for linear actuator frc

​@@nsfwmachines8343 linear actuators frc

Thank you! :)

Same, I'd like to know how much weight it can withstand? 500lbs of downward force x2 of these would be what I'd need for an active aero use case.

I used to be able to measure the force (with current / voltage) using feedback from the drivers, but all I'm getting are null responses. I'm working on it - I actually delayed this video for weeks so I could have that info.

I wouldn't think it could support 500# - well, definitely not with the coupler I'm using. At around ~80# the coupler separates on the pull stroke. I've been prioritizing speed (>10"/s) The next version of this is going to be much larger. It's using 6060 with a 10x50 Igus screw, and TBD larger motor.

Sorry, I've checked my mail a couple times - even junk and trash. Can you resend? nsfwmachines@gmail.com

That's what she said

Yeah, phlebotomists love me :)

I've recently tried building some smaller ones, I totally understand how compact is important. One way to make them significantly smaller is moving the motor inline but underneath the cylinder. I also might have overestimated the required cylinder sizes. There're so many variables - width, length, even material of tube and cylinder, number of joints... I definitely erred on the side of having to much vs. having too little.

The stepper mount is an "HM10-57 Nema 23 Stepper Motor Mounting Bracket". It combines a BK bearing fixed mount for ballscrews and a NEMA 23 mount with space for the coupler. The 10 is 10mm, the 57 is the nema23 spec. They make every combination (HM12-60, etc.) but they can be very expensive. Between AliExpress and Amazon, you can find them as low as $35 and as high as $80. Made from aluminum or steel. It just takes some looking around to get a decent price. But it guarantees a perfect mount to the bearings. Great if you don't have a cnc or mill / drill press. The coupler for the shaft to screw is a flexible plum style. Wherever possible, avoid set screws for couplers. The clamp style hold much better and doesn't do any damage.

The vibration is very, very intense. It doesn't buzz , which I find annoying. It more like a knocking. You can adjust just how far the amplitude of the vibration is (stroke length), independent of speed. There's actually medical research done about specific vibrations (4k rpm, 3-5mm amplitude) that forces a ... reaction products like Ferticare take advantage of. The motor makes tunes that are musical. I have one of the machines configured to be a MIDI instrument, using a PC or a MIDI keyboard with USB to play songs :)

For the VSlot designs, not that I"m aware of. These are new, as old as the videos are really. I've been letting them run for a few hours, and tweaking the design - mostly making sure the end of the screw is supported by bearings. Unlike other screws, the 1/4" Igus is too small to support much weight. The inline (non-pulley) version has a lot of promise, my goal is to finalize the design, materials, and see if selling them would be viable.

Como lo puedo hacer que funcione el actuador de esa manera, que sistema eléctrico ha que montar

The motor is 30 and the screw is 24. The belt is 100, which is very tight. I know 110 is too loose, but 104 might also work. I've uploaded a BOM which has more info: github.com/MikesMachines/VCylinder/blob/main/BOM%20Nema23%20vslot%20cylinder.pdf

Where can I order one of everything shown !!!! 3:37

Hope they work on mine .....

EDIT - link was wrong. The most recent BOM for the milkit is : github.com/MikesMachines/MilkIt (Let me know if I got this wrong - thanks!)

First - I love your channel! I just got back from a bender of your shorts. Second - absolutely! For everything I've done, limit switches constantly trouble me. Even with hardware interrupts, I ran into odd delays using a microcontroller. The new drivers I've been trying out have assignable IO (rather than step/dir/enable) so the plan is to wire the limit switches directly to the driver. As far as force, I'm going to try and use the motor's software to measure it. It is definitely less than directly mount the motor to the screw.

Tough choice if interrupts dont work ( may the switch is bouncing?) If you interrupt the pwm signal to the driver, you cant restart. Perhaps you could separate the signal onto two micro-controller pins, IE one forward pwm and one reverse pwm, each with a corresponding switch which breaks the signal on contact.

I think that thing could lift a person in the most painful way, quite easily. Seems way OP.

The 3Nm stepper is definitely OP. There is something counterintuitive that's very important - running a machine at slow speed requires a LOT more power than fast. Those tiny machine with suction cups are definitely not safe. The reason is the tiny motors bog down with resistance (going in) and the only option with them is to turn up the speed control. Then when it reverses and the resistance plummets, it tears out at top speed (ouch).

Thanks - I definitely don't want to mislead anyone. On vids like this, I do hope the uses go beyond any single implementation. Other vids I mark as 18+ or try to make the title very specific. I appreciate the feedback!

I think I am going to build one to mount a plasma cutter to. Homemade equipment might not be “safe for work” from an osha perspective but I bet it will cut a straight line better than I can do by hand.

I've chatted with a few people about this. Personally, I think a completely NSFW channel / site that shows the DIY with real explanations and actual use would be great. I've been leaving just about everything up to imagination on use, but there are points that might not be obvious to everyone. I have a fet life account (mikesmachines) that shows some machines in use, but I think it would be awesome to have someone more confident on screen to watch. Any suggestions / feedback is really appreciated :)

I do have a bunch of improvements - there's a line of stepper drivers (open and closed loop) that use path tables / motion. The CL57RS (CL = closed loop), DM2C-RS556 (open loop), and the NT60 (both open and closed, 2 and 3 phase) are what I've been working with. So no programming or microcontroller is needed. They have IOs that ca nbe connected directly to limit switchs or push button switched to change profiles etc. For hardware, I'm finishing up a cylinder that uses vslot 4040 as the linear bearing and body. It's amazingly compact - I'll post a teaser vid with materials list tomorrow hopefully. I cut a few to many corners prototyping and it just ripped itself apart when a printed bearing failed.

@@nsfwmachines8343 nice! can't wait.

I do mean the linear part! The floppotron is amazing - when I made my first stepper organ that project was a valuable resource.

Excellent point - I do think the linear part (dynamic reciprocal movement) is new, at least in the way that gcode isn’t spatially aware, but static.

I'd say a range of 30 to 180 rpm (well, strokes per minute) in use would cover nearly everyone. Personally, speeds higher than 120 per minute are too much. This is just observing from the software, during a ~5" stroke at 90 strokes per minute (very rough estimate, 8x microstepping), it peaks around 650rpm, but spends a lot of time accelerating / decelerating

Seems like this is worth a try and I've got plenty of spare parts .... I'll post a vid tmr :) Attached to the screw, the 180w / .6nm servo is *very* difficult to stop. If you can cycle the cylinder by hand the servo / screw won't have any issue. Micro stepping and screw lead options can provide either low end torque or higher top speeds.

Seems to work well even cobbled together like this - I'm sure you'll do better than this for a setup :) ua-cam.com/video/M9aLwvZxYgc/v-deo.html

Really!?! That's awesome, I'll give it a try next time - thanks!

Came here to say this.

LOL - love this! I have materials lists separated by project at github.com/mikesmachines - materials for the milker and receiver are at github.com/MikesMachines/MilkIt Let me know if I'm missing anything :)

@@nsfwmachines8343 so I have your parts list and have much of it on order now I’m trying to figure out how you put together the handle and where you get the parts for the handle and why you have a handle additionally, does your parts list contain anything for the endcap bleeder valve?

I haven't thought about renting! This is the first machine I've made that should have reasonable shipping costs - I'll let you know when it's getting closer to finished :) There used to be rentals from machineyourself.com, but it looks like the site has shut down :/

Gibt es vielleicht eine Teileliste, Bauanleitung, und wie funktioniert das mit der App ? Sehr interessantes Projekt 👍

That's good to know about the TMC, I haven't tried it! With nema17s, the DRV8825 is slightly quieter than an A4988. You're spot on about the drivers - especially in precise machines like 3d printers.

I believe you're right. I've seen closed loop stepper drivers off the ability to run open loop, but this JMC servo has a parameter to enable 'full closed loop'. I'm assuming it's a leftover from their steppers, but it'll be interesting to test out.

Yo, me gusta saber cómo puedo hacer funcionar el actuador de esa forma, que sistema se le monta, saludos

@juanrf7722 In this video, I used an ESP32, using the ESP Flexistepper library. I’ll have more info on the control side soon :)

Thanks! :)

I agree - steppers have such a range of tones they make! They're really clear about what's going on with them. I keep grabbing the servo to see if it's hot, I don't have a sense at all how hard the servo is actually working. Here's some happy steppers from an old project: ua-cam.com/users/shortsfcgiUcX_KjQ

Thanks;) more stuff being rolled out slowly on design options for receivers.

Hi! thanks :) I use a STEPPERONLINE Nema 23 3NM with their DM556T driver. I've had no issues with it on 3.3v from the ESP32, but some people have used 5v logic shifters. I also use 36v or 48v supplies. Below 24v their top speed is noticeably slower.

@@nsfwmachines8343 Thank you for the reply. Where can I find the rocker arm?

@@thomascurry1284 Aliexpress is by far the cheapest - $15, free shipping. You just need to pick 8mm or 10mm shaft size for your motor and the stroke range (which is labeled RPM in the link for some reason). The larger stroke model is quite long - I have to be careful it doesn't smack in to the floor when the machine is on it's side. www.aliexpress.us/item/3256804305928073.html

Only recently, I considered how loud the machines are. I’d been so focused on being able to take them apart / reconfigure quickly that I didn’t even tighten all the bolts. I just got some polymer bearings, rails, and carriage from Igus. They are incredibly quiet! For actuators, I use a couple on a machine stand, but I haven’t found any in my price range that have speeds like the ShockSpot. Have you seen the Hugher Tango? It uses a cable system that’s similar to what Harrison Low is doing. It’s genius!

@@nsfwmachines8343 That Hugher Tango, I don't know how they get away with the pricing, but I suppose it would be low volume. Electrical linear actuators would be the best option the barrier being the price. I think the best option for me is the gimbal motors, and I'll keep searching for something as compact and quiet as possible...

Oh - sorry I misunderstood actuator vs. motor. Someone on Reddit posted a vid a few months ago of one they got working. ua-cam.com/video/x8gEdLga4-8/v-deo.html They are powerful, quiet, and fast, but I don't know how well they would do being moved around and repositioned on a stand. They are coming down in price and available used on EBay (around $1500 with a driver). I can't say it's a $3000 feature, but the one thing the tango has nothing else does is that the motor is separated out from the cable drive system. Thanks for the info on TournesolInPrivate - just saw his videos! Very interesting!

@@nsfwmachines8343 I can see a lot of time being spent on making a linear motor, have seen some with rod/core filled with ND magnets and copper coils surrounding, though I think these even go up to 4-phase, I can still see a cylindrical linear motor being even quieter as it doesn't even need bushings -- it's the electronics that someone has to simplify or package first... As for positioning etc, have you looked at the F-machine Gigolo? Only 1-4" stroke but nicely packaged.