Grizzly G4000 9x20 4 Bolt Compound Clamp Mod
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- Опубліковано 29 вер 2024
- Here is the first needed modification to you 9x20 Metal Lathe. A 4 bolt clamp used to steady your cutting tool. You can watch the process on making the clamp.
Steve Bedair LINK: bedair.org/clam...
This is one of the first improvements needed on the 9 x 20 lathe's. I have included photos from start to finish to build your own clamp. I have also included measurements but please note that these are the measurements that worked for my HF 9 x 20 lathe. All the 9 x 20's are basically the same but exact measurements may differ.
Thank you for responding. I do that when I centering the tool, however, the adjustments on the tool holder wont let me go lower, I think I will have to send the tool holders to a shop to take down 50 thousands.
if you can t go any lower, you could grind the bottom of the tool.
I bought this same lathe from Harbor Freight about 8 years ago. It was a floor model, so I only paid about $400 for it. It had a couple of issues which were easily fixed, but this modification isn't just a nice suggestion, but an absolute necessity, IMO. These can be turned into really decent little machines if you do some work on them. This is the first mod that should be done, and will make this lathe much more rigid and stable.
I got me this same lathe (Central Machinery) last year 2021 from some scrapyard in KY for right round the same price... this was the first mod I did after fixing up the poor thing which had been banged up rough from its time in said yard.. and even I was quite surprised that I even managed to pull it off even with the most basic of tooling and a ‘Meetotoyo?’ digicaliper.. Still there to this very day. As for the graduated dial slot, I had to mill that on the lathe with a vertical milling adapter table thing.
That, and I had to turn it from a 5/8” thick plate, which turned out real nice as it was thick and solid, though thinking in hindsight, I could have made more space for the bolt heads, but it all worked out in the end despite it being a rather tight fit.
You guys think about buying a surface plate and a height gauge to layout your parts ?
Nice job
Don, great video.
Did the modification work? I've just recently purchased a new Chinese lathe and the finish on longitudinal cut is awful. I will likely do this mod, but it would be good to get your views on whether or not it made a difference.
Stay safe in these troubled times.
Cheers
Mark
Hi folks, overall a really useful idea but don't use a drill chuck with an end mill cutter. That sort of chuck cannot grip tight enough and the tool can be pulled out by the cutting forces with possibly very dangerous results. Drill chuck are designed for pushing, not the pulling that happens with an end mill. Also do not use standard bolt heads in T slots. It's a very good way of distorting the slot. Use the proper T nut - they are designed to spread the load for a reason. BobUK.
Thanks for the feedback Robert
T-nuts aren’t exactly a buy whatever you need item, sadly.
The way my lathe came as-is already had standard bolts shoved into the t slots to hold the compound assembly in place using the original clamp, and of course it sucked, but had to make do until I managed to mill t nuts for it using a lathe milling adapter table and a toolmaker vise (yes, I put endmills in the chucks, and no, I didn’t have any choices at the time) - that, and the stock lathe t slots weren’t standardized stuff, or at the very least weren’t some item one could just order and be done with - one had to make them to fit these slots, and it was doable, albeit not easily.
That being said, those t nuts combined with this 4-bolt compound clamp I had made as shown in the video (thanks also to Steve Bedair) was not only a much better and more rigid setup, but also had the advantage of having the nuts in a different location than the original, which were already sort of busted by the time I bought it.
Great job. Little tip though. When milling use a collet rather than a drill chuck.
Why
Agreed, sometimes i get lazy tho.
Just a suggestion.... Offset the center hole to one side to make it easier to see the graduated dial. The larger diameter hole on the bottom should break through the side without the need to then mill a window. Great job. Keep up the good work.
Good job. Nice presentation.
Did you say Grizzly 9 by 12 on page 12:00 ?
I would just like to add some advice, when making this replacement for the two bolt clamp do not turn the centre hole to the size given. After making this modification it has been found by many lathe users that if you bore the centre hole to a close sliding fit to the spigot on the bottom of the top slide, this will go a very long way to eliminate tool chatter.
I am planning to make one of these Thanks for the idea. How about using an hole saw and making a slightly smaller hole than the smaller finished inside diameter to hole the piece in the chuck for the first operation? That would also save some time in the next turning as most of the metal is already removed...
Horrible music
Bruce Foster here,I have the same lathe and your video was a perfect inspiration to do the same .I have got to get that metal and make some chips.Thanks
Don, this is really a superb video, just the right level of detail and explanation. I don't have easy access to a piece of steel the correct size, but I do have a block of aluminum, so I'll try using that to make one of these plates for my 9x20.
First time watching a video on this channel and love it. Good and quiet background music, and just clear communication with no rubbish.
Hi Dorian, Thanks so much for the comment. It really means a lot to me; hearing people that appreciate my videos and understand clearly what i'm attempting to do with them. At the time i put this video together, i was trying to be perfect in form. Since that time, i have drifted away and no longer attempting this level of quality; and it make me sad. Perhaps if more people showed appreciation that you did, i would still have the same level of focus. As it is now, it is difficult to even sit behind the editor or raise the camera. I have much footage going to waste as i have not found the audience i was expecting. Have a great day sir!
@@DonBrandt Well I'll mirror Dorian's comment. Outstanding work. Thank you.
You can find a whole lot of tooling and other lathe parts on E-bay and Craigslist. I sometimes buy from Amazon but usually have much better luck and prices with E-bay
Side pressure on an end mill mounted in a 3-jaw chuck can cause the chuck to loosen. Don't ask me how I know.
very good but uhh how are you spose to tell what angle your compound slide is if you cant see the marks
Well done video with clear voice background music OK.
You need to be careful when boring out the hole, I wasn't and I snapped my boring bar when it hit the chuck jaws. Luckily I had another bar to complete it.
I need to make one for my JET BD 920N lathe
I am about to buy one of these lathes. I have already done this to a Jet mini lathe so this time will be a breeze! Great video! Thank you!!!
I did mine a little differently but I think I'll make one like yours. Yours seems better than mine. That really is a big weak point in this lathe.
That was pretty cool Don. Hey it looks like you have the sound problem worked out. Thanks for sharing your nice build.
Best Wishes n Blessings. Keith
Hi Keith, i can always trust that you come over and say hi. It means a lot to me..Thanks for your comments -Cheers
Hello Dan... I thought for a long time before I posted. Not trying to be a Troll, but I have 3 suggestions... After 60yrs of machining and engineering, in my shop we have several rules we abide by. Please understand they are just suggestions, and I don't try to offend anyone. #1> Never ever use an End Mill in a drill chuck, use Collets, or tool holders, doesn't mater even if it's an 18N Super Chuck... #2> I cringe when I see someone using a Dial/Digital Calipers for a Scribe, even if it's a cheapie, it's still a precision tool, and your Mitutoyo is not cheep, If ya have to do it, pop for a $10 HF POS, they're disposable :-)... #3> I like using Center Drills for pilot/spotting holes... The counter sunk pilot will aid when you start the larger drill bits, and will not chatter/wander... Thx for the great Vid...
I think that is the first upgrade most others make for their 9 X 20 lathes. I know I did it that way as well. Nice video to show it being made.
I did not, but my lathe is different model although it is pretty much same size.
Great Video. I also own as G4000 lathe, have 2 questions where did you get the tool quick release, and did you modify the pulley system to use the normal V-belt, the present 5mm belt can't handle heavy operation or cutting.
Hello there, the quick change tool post came with the lathe.. Check out the video of me picking it up here: ua-cam.com/video/CkePxIUMBSQ/v-deo.html I think you can buy it here: www.grizzly.com/products/Quick-Change-Tool-Post-Set-Mini/T10167?Page&.com I am still using the same belt, i did order a few extras however.. Thanks and cheers!
I understand that the four bolt compound clamp is THE very first thing you should do to improve the 9 x 20 lathes rigidity.
Stiffening the toolpost is the first thing that you should do. All cuts that you make with it will be better than you can produce with the factory mount so all of your subsequent work will benefit from it. This mod helps but IMO a better solution is to make a Pitkin Donut compound base, which stiffens the toolpost by a measured factor of 5 and is easier to make than the 4 bolt clamp. My first facing test cut on some aluminum using mine looked and felt like it was polished.
coleman-family.org/Files/Donut%20Compound%20Mount%20for%20the%209X20%20Lathe.pdf
@@CapnCrusty thanks for the link. That's a great idea.
i need Tslot cross slide.
I don't suppose you are selling this mod? I just acquired a G4000 in a trade that I did. I've wanted a lathe (and to learn to use one) for as long as I can remember. You make it look so easy! I met a man in an auto parts store yesterday who is a retired highway patrol officer and master machinist. He said he is willing to help me learn how to use it. But I really like this mod that you did!
Hi Cullen. Thanks for watching the video and leaving a comment. Sorry no not selling. Its a project that you can do, but it will take some time. Good luck sir and cheers
Just wanted to say thank you for doing this video. I made the same part and it made a world of difference! The original design just doesn't hold the tool post as rigid as it needs to be, and this mod made it rock solid.
that end mill didnt sound happy at all
Mr. Brandt good work I should do it to my lathe, however, I don't have a mill. Question what is the model and # of kwick tool changer. I purchase one to use 1/2 tool holders but they are too tall, and I can't center the tool to the job, if I had a mill I could fix them to fit, Thank you and have a nice day
Good question, i find that i have to set my tool heights for every tool to be on the center line of the work. Some Quick Change tool holders have an adjustment screw that helps. A good way to find the center-line is to move the time to the live center and have the top of the tool meet the point of the center.
Only changes I plan on making when I make this is to mill the bolts and back on the hold down flat
Love Shapiro's, I have been going there for years, haven't seen Stan for ages now, I mostly deal with Sam, great place to get all types of metal.
You can find Stan driving the golf cart around.. LOL
Thanks for the time to make this video. I do know it takes time for that. I am struggling with the first purchase of my first lathe and wondering if the G4000 is enough for my needs.
Talk about perfect timing...I haven't seen that bolt in the 3 jaw to secure a piece of square stock technique before. I am about to be making some plastic bushings for a project and that will be a perfect way to do it. I will be sure to give you a plug when I get ready to upload the video for it!
I can't wait to see you bushings video. If you want to cross promote sometime, let me know.
Don Brandt I'd love to! I'm actually going to be doing a video like that this week on my other channel. You can email me at connellkevin76@gmail.com
I really like your new lathe. I have an old 7x10 that I have been learning on. I'm still very much a novice with it but they really open up a lot of possibilities for diy'ers. That Grizzly looks like a much nicer machine. I'm more experienced with woodworking so I'm always learning new things watching how other people do machining work.
I don't have any plate steel. i have some hardened aluminum plate I can try. Does anybody sell these things? It seems if this is the #1 improvement somebody would be knocking them out for sale.
Do you have a collet set ? I see you use a drill chuck to hold your end mill. It works , but the collets are much better for a few reasons. If you have good collets , they will have less run out than your drill chuck . This will add longevity to your end mills ! And believe they have much stronger grip than a chuck. The other good thing about collets is they will shield you from harsh comments from the Know it all's ! lolol
That is a lot of boring for the center hole. Maybe instead of drilling a 3/8 hole initially, you can drill a 1/4 inch hole (and use a 1/4 inch bolt in the chuck). When you are done, you can use a 1 and 7/8 hole saw (or similar) with a 1/4 inch guide bit to do most of the center hole. You can then use a boring bar to finish it up.
Yes what a pleasure, good video and sound, have subscribed 👍
Thanks for watching
I need to make a tool post holder something like what you built , good job btw. I was turning a piece of brass stock and the tool post was ripped clean off the cross slide ! Broke the cast iron base !
Funny i have used this machine for years with no modifications.Did you tighten the base unequal with debris under it?Did you make an excessively deep cut or did you crash the tool post into the chuck?Parts can break but if you find yourself modifying your machine you may need to get back to basics.When i write programs for our Haas VMC”s or lathes at work I am trying to be efficient and maximize profit.When i make parts with my home Jet 920n I understand that i have to work with a different set of parameters.The vast majority of all modifications i see on these small hobbyists machines are totally unnecessary and are the results of poor set up and tooling use by the user.I have hundreds of hours on mine and have used it most of the time on 304ss and 316l .If you exceed the limits of any machine you are going to have issues.Poor machining practices / improperly sharpened tooling are the root of the majority of problems with non professional Machinist.Food for thought.
do you sell these
I am assuming that when people do this project, it is to bolster the rigidity of their cross slide. If that is the case with your effort in this video, why then did you not comment on the effectiveness of this project? It would be nice to know how well it worked.
very nice
Nice thought and work.
Do you find the window is a bit too thick? Have to stand perpendicular to view degrees.
Thoughts about window to modify into taper shape like those window found on castle wall ?
Nice!!! I have G4000 and I llove it.
Very good video.Like.
Great video, direct and to the point, more please!
Very clear and well spoken video. Did I send right you just eye balled the distance between the t-slots for the bolts? Did not see you face the bottom of the plate when you were boring it and later look maybe sanded a little?
would have been nice if you'd have demonstrated why you went to all this work and how you might not in fact need to use a flashlight and an ocular to actually read off the angle? sorry - i dont' get it
Hi
Nice video.
How much would u charge me to make and ship one of these plates to me please ?
Thanks
Just what I was looking for. Can't wait to try it. What QCTP are you using. That's something else I need to do. Thanks.
Hello Dale, awesome, glad to hear.. Below i'm sending the links for two products, the i want and the one i have. I would surely get the one with the handle, as it is, i'm using the one that came with the lathe. Thanks and Cheers
The one I would Recommend: www.grizzly.com/products/17-Piece-Quick-Change-Tool-Post-Set/T10166
The one im using: www.grizzly.com/products/Quick-Change-Tool-Post-Set-Mini/T10167
Thanks. Truly enjoy the channel. Please keep them coming.
Just a quick note: Grizzly.com states that the T10166 does not fit the G4000. I'm no expert, but from my research the G4000 takes an AXA type QCTP, LittleMachineShop.com and Shars.com both have reasonably priced units.
Thanks
good job
Muy buena la caja cuadrada que dureza tiene 4041 o es otro calibre más blando Felicidades maestro.
Translation:Very good square box that hardness has 4041 or is another gauge softer Congratulations master.
Thanks Faustino!!
Parabens muito bom seus videos facil de entender.
Sou apaixonado por mecanica .Ainda vou comparar um torno mecanico pra mim.
Poderia por favor de dizer qual o tamanho do seu torno.
E fazer um video mostrando suas ferramentas como torno, furadeira, etc
Desde ja agradeço.
Translated text:
Congratulations very good your videos easy to understand.
I'm in love with mechanics. I'm still comparing a mechanical lathe for me.
Could you please tell us the size of your lathe.
And make a video showing your tools like lathe, drill, etc.
Thank you very much in advance.
Thanks for you comments, the lathe is 9x20 Grizzly lathe
I have been thinking of doing a short video of my workshop for a while now; if I did what would you like to see?
One word of advice to any one considering replacing carbon steel screws with stainless. Don't. Not for any thing where strength is more important than corrosion. Stainless is about 60% of the tensile strength of good quality carbon steel screws. Also either make tee nuts or make a long tee bar that is the distance front to rear of the plate. Drill and tap that. That will spread the loar of the locking screw over a larger area.
I used high tensile steel bolts and nuts. Been working perfectly for many years.
Great video! Thank you for your time and effort.
Cheers Rolando!
Well done Don. Totally a workable mod fella !
Hello Tomoko, thank for the comment. I've got a bunch of cool videos planned, Have a great day!
Looking forward to them bud. Tomoko is my silver pouring channel. I am otherwise known as Dean Lorman and have been around your channel for a while now. We have a lot in common and if you like it would be great to see you come by Tomoko and a thumb up or down will be just fine fella !
Yes, I recall talking to you and seeing your videos! I love casting, and I've enjoyed your pour vids. Thanks for watching! I've subscribed
Dean here and you are doing yourself a fine service bud. Stay doing just what you are fella !
Don, I’m making this part right now and I’m about half finished. How has this mod held up? Did you really notice better rigidity and cutting from this modification?
Thx 👍
Hi mike, I'm sure you will be happy with the upgrade yes, I get much better cuts. Thanks for the comment.
Don Brandt I noticed in the video you stated “3/4” bolts.” I know this wasn’t 3/4 diameter but rather the actual length of the bolts. It seems nothing larger that a 1/4” bolt will fit into the slots once the head is ground a bit. Can you confirm you used 1/4-20 bolts or did you use a metric size? TIA👍
@@mikemike6096 Hello Mike, yes there 1/4-20.. I had to modify the heads to make them fit as shown in the video. Im pretty excited for you!! Its cool to hear someone following the video. Cheers Buddy
Don Brandt 👍
mike mike I just made this mod to a 21 year old Central Machinery 9x20 that was given to me. Had been sitting in a barn unused (except by mice & wasps!) for 20 years, and was still in the original rotted out box! I printed out the drawing from Steve Bedair website, which shows three different bore sizes instead of 2. I screwed up and made the 1st smallest bore too big, and wound up only having 2 bores like yours. I’m not really sure why they added the third bore anyhow. The drawing shows the hole offset on the plate, but I centered mine up on a 4” square piece. After the bores were done, I marked a cut that opened up a 3/8” (+ or -) window to see the degree wheel similar to the original clamp, but much smaller. No problem seeing the degrees when done this way. The end product is rock solid! Thanks Don for the vid! It takes this lathe to the next level!
Hey Don could you build me one of these? I have a grizzly g4000 as well, just no time to use it! Thanks.
Do you have a lathe? It's a fun project to do.
great idea, just bought one of these 9x20 lathes and after seeing this will be doing the same mod...... Thanks
Hello Peter, congratulations on the New lathe. I appreciate you taking the time to write a comment here. Have fun with the new toy!
Genial!
Who was it you mentioned in the video has made modifications to this size lathe?
Check Here - bedair.org/clamp/9x20clamp.html
Гениально супер!
What brand qctp is that ? thanks
Amazing 👌 idea
Me like 😁
Just bought one of these lathes, hopefully you can answer a few questions I might have as I'm getting to know it.
Let me know how i can help?
Thanks, I'm after a quick change tool post, will the ones for the smaller mini lathes fit? they seem to be very common.