MAKING A BETTER ADJUSTABLE TIR LATHE CHUCK

Making an adjustable TIR lathe chuck from a standard 3 jaw chuck and backing plate. Showing a way to stiffen the chuck body and load the chuck body in compression using a needle thrust bearing arrangement. Callibrated adjustment screws allow precise adjustment moves.
#practitioner_of_the_mechanical_arts
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[@StefanGotteswinter]

Robin, such a clean design - Love the super close fit fine pitch screws. Thank you so much for taking the time to film and share this design.

[@IGBasov]

Hi, Stefan. Thanks a lot for your video. Especially about scrapping. Helped me a lot.

[@ROBRENZ]

Thank you Stefan for watching! ATB, Robin

[@tonywilson4713]

Actually Stefan without a couple of the vids you have done on "cost effective" chucks parts of this video would not make as much sense as they do.

[@Brrraaack]

@@IGBasov Stefan helped a lot with dieses verschrotten :D

[@T1nCh0]

Babe, wake up, Robrenz uploaded a new video.

[@macsmachine]

Perfect comment. 😂

[@dominicmolloy561]

A new Robrenz vid. The holy grail of KZbin machining.

[@misterwilling]

You ain’t lying

[@DavidBaumgarner]

A new Robrenz vid. The holy grail of KZbin, period. 👍

[@summerforever6736]

For sure!

[@nowar9220]

The quality of parts/work that gets cranked out on this channel is top fkn class!! Gives us a real insight into how engineering actually practically playes out when high tolerances are required! Even tho i have done some highly accurate work myself ik constantly suprised and learning new things with ROBRENZ!! LOVE IT!!

[@kennyl4510]

Robin. Thanks for your patient kind and considerate manner. You're an educator and a great mind. Cheers Ken

[@Engineerd3d]

Had to push out watching this video until I had enough time to watch in one shot without distractions. lovely work as always Rob

[@ROBRENZ]

Thanks for watching!

[@brucethom4957]

Spent the first 12 years of my career as a toolmaker, specifically mold making. Spent the last 27 years applying the skills and techniques learned and that you are documenting of precise toolmaking techniques. It’s amazing to me the tools we make do with - fixtures and machinery, that were never thought out to the level of precision that toolmakers demand. Keep up the good work, and the awesome documentation of our trade!

[@ROBRENZ]

Thanks for sharing

[@oxtoolco]

I especially like the re-purposing of the socket head cap screw! When you started talking about the elongation of non-homogeneous constituents and the grain structure of the material in the direction of working during forging I really got excited. Bravo! All the best, Tom

[@ROBRENZ]

Thanks Tom, those SHCS really machine beautifully and are way cheaper than 17-4. At 170ksi yield strength for 1/2" and below, they are tough to beat. ATB, Robin

[@tonywilson4713]

@@ROBRENZ I've seen other people make things from bolts but never to make a part like this.

[@psykosis101]

​@@ROBRENZ for Tom to get excited about materials science you must really be doing something special!

[@EricBrummer]

If only we could clone Robin and fill a university program with him instructing. I wish even half my instructors were as skilled, knowledgeable and capable of communicating this effectively. Always fantastic useful content.

[@ROBRENZ]

Thanks very much Eric and thanks for your undeserved continuing support

[@rkalle66]

It's funny when you're mentioning Dan at the end of the video having an improved version after you're giving a ton of details how you improved you're chuck.

[@jimsvideos7201]

Once again I feel like a half-wit freshman who wandered into a grad class, but even I can learn a few things for today and a lot of things to look forward to trying in the future. Thank you very much for all the time and wisdom you've put into this.

[@floodo1]

That shot with the giant orange c-clamp and the indicator coming through the bore was the most mad scientist thing I’ve seen on this channel hahaha As usual, thanks so much!

[@Garthinyus]

Hoping you and yours are well this season, God's blessings on you all!

[@pupperozucca4994]

Rebrenz, I am an electronic engineer and I understand only 50 to 80% of what you are saying. The main reason I watch your videos is the passion and the motivation you put in your job. It inspire me in what I have to do. There is only way to get stuff done: pure and crystal clear perfection... or at least always try to.... Many thanks from Italy

[@psykosis101]

As a hobby machinist, a lot of what you are going on about is way above what I FULLY understand, but you relay it in such a way that doesn't make me feel like a complete idiot and that is very much appreciated. Keep up with the excellent content, it's greatly appreciated

[@Watchyn_Yarwood]

Very well said!

[@Designments]

I'm grateful every time you post! Your video on spindle bearings guided me to design and construct my own spindle for my Quorn tool grinder protect using DB ground bearings. Thank you! I know I'm not alone in appreciation of you sharing knowledge.

[@idpromnut]

Today was looking to be a soul-less day, full of software design and problem solving for me. Thank you so much for lighting up my day with your precision design, manufacturing and assembly of cool things!!! :D

[@cyrucom]

Not a criticism at all, but sometimes I watch your videos to fall asleep to 😅 I figure maybe I'll learn something even if I fall asleep mid video lol, subconsciously. Love the chuck idea!

[@richardhassett8827]

Watching your work is a type of religious experience. Thanks so much.

[@dexiedude]

Robin, I design custom chucks and tooling and I must say, your videos are always insightful and I love watching them to learn new tips and tricks for improving my designs. Thanks!

[@ROBRENZ]

Wow, thank you!

[@agusdrummer]

Put the kids to bed, kill the phone lines. Brace yourself for a proper learning session. Robin, the way you integrate planing and execution, theory and practice ist just wonderful and so accessible that it always makes me believe I could achieve something within this realm of precision. Of course there's it's only wishful thinking still. Thanks a lot professor.

[@grippgoat]

"chuck pimping" is not something I was expecting from a robrenz video. 😂

[@georgecurtis6463]

Ok, give an early warning that your mind might be blown away ! I had to watch this in three sections as my mind would stop working.

[@uncleTedLol]

Robin, you are truly brilliant. Thank you for revealing the why's of your design choice - extremely valuable insight for those of us learning the art of engineering. I can not express my appreciation for being able to learn from you. This chuck is second to none, which seems to be a standard for your work.

Would it be better? if we cut a little step on the out side edge of the adjust screw then engrave the division marks on another ring and gentle press fit it to the screw. Just fit enough so it not turning around but we still able to adjust it. Because the thread with move a little bit over time so those marks wont always stay on the same spot as we want. Just my thought, not trying to be smart 😅. I got no more word to say about your works but still have to comment.😅

[@ROBRENZ]

That would be a nice enhancement. I figured I can put a shim under the screw heads before the hardened race goes on if I need to tweak it for wear. Thanks for watching and commenting Cà Lem, Uncle Robin

[@Garthinyus]

Ditto what everyone else said! You are a treasure and a blessing!

[@durangotang1681]

I’d like to send a big -thank you- to you for spending so much time over the years teaching the internet awesome things. I spent seven years at a shit job soaking up all this info 8 hours a night and built my own cnc shop at home a few years ago. I learned enough from people like you to finally score a CNC machinist job which is damn near unheard of in my area. Starting a LLC this month also in hopes of putting my own products out in the world. So thank you again friend. P.S it’s probably your fault the boss kinda got at me today and told me not to make a masterpiece out of every part and “just debur the damn things!” Was running the mill, cmm and deburing simultaneously. Got a little in the zone. But they Rob Renz smooth, better believe it.

[@DavidBaumgarner]

When you take pride in your work, customers notice.... Your boss needs to remember that. ( or maybe he hasn't learned it yet, but im giving him the benefit of the doubt here. 😉 )

[@joell439]

Impressive as always - so much going on. I think I may need to watch this several more times to force it all to sink in 😁. Thank you Robin.

[@robbourns2831]

Robin, you truly are the goat when it comes to this stuff. You should have millions of subscribers just off the knowledge you have and all the little gems you throw into each video. I have to watch your videos multiple times to catch them all. I very much appreciate you for all your hard work, especially for putting this all into a video for us to watch and learn.

[@Watchyn_Yarwood]

Agree 100%

[@priority2]

Amen!

[@homemadetools]

Great to see you back in action. We shared this video on our homemade tools forum this week 😎

[@ROBRENZ]

Awesome! Thank you!

[@rustygardhouse7895]

Wow! Dan Gelbart. That's a name I haven't heard in a while. I worked at Creo when it had 150 people. Dan let me have access to his library of precision design texts. Learned buckets from them. Enjoy your posts!

[@Trent-tr2nx]

If you aren’t aware, Dan has an incredible set of videos on KZbin, one detailing his air bearing lathe and others showing his absolute dream of a home machine shop. Were there any precision machine design texts that you’d recommend?

[@warrenjones744]

This is like next level coloring outside the lines. Outstanding Robin. I do so enjoy watching and learning from someone who is really really good at what they do no matter what their discipline may be.

[@kevinreardon2558]

And another episode of ROBRENZ where I have to stand on a chair so it won't be over my head. Thanks ROBRENZ, I always enjoy and amazed by your content.

[@StraightThread]

Wow! It was a pure pleasure to watch this video. There is something magical about the way you share your rich, brilliant insights. Thank you for sharing.

[@ROBRENZ]

Glad you enjoyed it!

[@michaelmiller5566]

It's very easy to listen to you explain Your processes for an hour. Your thinking process is Incredibly thorough.

[@matthewwest8689]

Very cool design and some great tips. I’m adding this to my list of shop projects. Thanks for sharing Robin, as always very educational.

[@joshwhite6947]

Wooohhh new robinZ. Damn neer wrecked the truck. Yeah I watch KZbin and drive. Traffic is dead slow. Roun here. 👆🌍✌️

[@craigs5212]

Robin, glad to see you back! Very nice project love the use of the cap screw as raw material, a nice reason not to chuck out old bolts. Thanks Craig

[@MachiningandMicrowaves]

Another gold standard project Robin. I sometimes use those high-tensile socket screws as stock for making parts, I hadn't thought that having forged heads would make them even stronger. So many insights in your videos.

[@Shawn_speed]

I’m not proud of my machining skills, just thankful that the knowledge allows me to appreciate how many facets of design , solid works skill and precision machining Robin is showcasing here.

[@andersjjensen]

YAY! My favorite machinist goes space cookie on precision again! I am consistently amazed at how "wrong" my natural senses are about the world around me. My senses tell me that stone, big lumps of cast iron, etc are mathematically rigid, and it is SO intriguing to come along when you break down all the directions in which force is applied to make everything flex like jelly. I'm also pretty proud that, having watched all your episodes, I now have a pretty good "hit rate" on guessing what you're about to address. I totally called it on the amount of stik-out of the back plate in the vice as you were about to machine the opposing edge.

[@edpopelas2844]

Robin the thing I enjoy most about your channel is the mindset that you can make something that would be considered standard “ho hum” and refine it to make it top notch.

[@canonsonico3752]

The fact that robin gets to upload new videos stomp me everytime. Im like "robin is gonna b da first man to make chips in space"

[@theodoreshasta7846]

Your work is carefully thought through and masterfully executed. It was a real treat to watch this video. Thank you!

[@davidcolwill860]

Excellent! Thank you for taking the time to show all of this. Like many of your videos, I am sure I will be returning to this. There is always more to learn.

[@nraynaud]

the shot with the laminar flow coolant is an interesting window into the toolmaker subtle flex culture :)

[@TraditionalToolworks]

This is yet another amazing idea, this is a good one. I suspect chuck manufacturers will build these into the chucks in the future. Remember that imitation is the world's best compliment. 👏 EDIT: this needs to be named a RenzTrue! Amazing how much thought you put into this. Above my pay grade!🙄 XLNT work as always!

[@summerforever6736]

Rob is a Profectionist!!! I Love it!!!! Well done Again SIR!!

[@dpmachineworks]

Beyond impressive as usual!! Thank you so much for sharing this informative video. Appreciated more than you know!!

[@ROBRENZ]

Glad it was helpful!

[@LikeFactoryMade]

Its a holiday for me every time you release a new video. I think your statistics will prove that most of us did not skipped a second. Thank you for being an inspiration for me and others like me!

[@tonyking9235]

NICE ONE WOLF IN SHEEP'S CLOTHING. BEEN HOPEING YOU WOULD PUT A VIDEO ON . THANKS BUDDY.

[@ReubenSchoots]

Robin, That was awesome, in the true sense of the word. So many bite sized pieces of knowledge. Thank you for your willingness to share every important detail from start to finish. Your dedication to both your work and educating others is inspiring. Kind regards and best wishes, Reuben

[@ROBRENZ]

Glad you enjoyed it!

[@user-wv4ss5fb6g]

And still waitin for next video of precision toolroom spindles.. Will be also interesting to see common work and tasks for such spindles in workshop)

[@ronkellis769]

Pending watching the whole post, THANK YOU and a special note for showing where you are going first. Bottom line up front is US Army writing, and I often go all the way to the end of a KZbin posting to see where they're going before I decide to watch it. Kudos!!!!!

[@rocksolidhugo]

The only channel I "thumb up" before even watching the content. So happy to see your always-amazing-over-thinking back. Thank you ,sir.

[@PeregrineBF]

Great video and cool design. Also good to call out Gelbart's chuck, he has a lot of cool designs.

[@FCleff]

There is so much valuable, innovative information packed into this video, I don't know where to start. I built a chuck stop for my 9" SBL based on your design shown at 23:00' and it really is incredibly useful. I'll be thinking about Making A Better Adjustable TIR Lathe Chuck next. Thank you very much for sharing your experience, wisdom and skill. Cheers, F.C.

[@carlhitchon1009]

When one of these pops up, I save it for a while, like the cherry on top of a sundae.

[@jerrysanchez5453]

Man i normally pride myself with the fact that i think of things in in measurements fairly precisely but when i watch robrenz i just feel like a child lol

[@Orgakoyd]

Thank you Robin for taking the time to film and edit these super high quality videos! Both the content and the video quality are second to none! I really love the matching ground step height for the back plate, and the pressed in stiffening plate made such a difference. I never knew about the long bolts from the front vs short bolts from the back design detail so the bolts can flex and not impede the skidding. I think of the bolts acting like flag poles in the wind.

[@randyjones9188]

The Master has spoken...nuff said

[@oldscratch3535]

I got kicked off of Instagram twice so I miss a lot of your stuff these days. Glad to see another video on KZbin. Now, if I can just avoid getting kicked off of KZbin.... Oh, and I got a job at a firearm manufacturer running a Tsugami swiss lathe. I didn't have any CNC experience, but I aced their skills test b/c I've learned a lot from you, Stefan, Abom, NYCNC, and Oxtools so they offered to train me. I've been there for 11 months now and its been great. Already making $3.50 more an hour than when I started. I get all the overtime I want and I get double time for working on Sunday. We get monthly bonuses for hitting production and sales goals. I'm making way more money than I've ever made. You could easily crack $100K/year if you worked overtime every week. I finally have health insurance, a 401k, and PTO. Never had any of that before. You guys making videos and transferring your knowledge are a big part of why I was able to get that job and easily learn a machine I've never operated before so thank you all very much. I may be able to actually afford a house now!

[@ROBRENZ]

That is great, glad I could play a small role in improving your life.

[@93Martin]

I never believed in the whole "always use the same pinion to tighten a 3 jaw" until you actually explained WHY it makes a difference

[@LarsLondian]

Very nice demonstration and build upgrade, Thank you for sharing. Appreciated you sharing the information about the surface grinder and alignment, I don't currently have one, but perhaps someday. Take care L.L.

[@DudleyToolwright]

Another Renzetti tour de force.. Thanks for the lessons.

[@dariodalcin5177]

Such a knowledgeable and skilled man. Teach me how to do life

[@josephlovell6951]

I was just watching some old video of tour last light. Thinking I miss Robin... I know you are busy. So thanks for taking time to melt my brain. God bless

[@ryanvanderpol7962]

Thanks for showing the end product and use at the beginning - helps me follow the build process. Fantastic design and craftsmanship as always!

[@andrewgiles6192]

Foresight, beats hindsight by a damb sight. Favourite quote.

[@garysgarage101]

Gee Robin, you and Stephan go NASA level on all your projects. Out of this world amazing work you do! How about a 'back to earth' version next time lol.

[@sshep7119]

I have wanted to add thousandth scales to my chuck for years, I just never did it. It is still going good to sit far down on my to-do list but I am glad to see someone do it. Nice to see a new ROBRENZ video.

[@sshep7119]

Just wanted to add this in here, I am not challenging or claiming that you are doing anything wrong here. When I did my tool and die apprenticeship ship I was taught to NOT clamp anything with the 4 opposing screws and that they are just for pushing the chuck body around. I was told to back off the face screws one half turn each, push the chuck body until the part was running true, re-tighten the chuck face screws then just ever-so lightly tighten the 4 jack screws. Not to apply any holding force, more so to keep them from walking out during cutting. The back side of the chuck and the face of the mounting plate that make contact with each other are lapped together for a true contact. I have been doing it this way for years and never had the slightest indication of wear or issue.

[@ROBRENZ]

That is an excellent procedure!

[@mickymondo7463]

An absolute masterclass, not much else I can say really I enjoyed watching and your simple explanation makes it a pleasure. The old lead mallet seems rather Neandathal now 😂

[@henmich]

That tap handle is glorious.

[@ROBRENZ]

Standard Starrett tap handle, they are beautiful.

[@user-wv4ss5fb6g]

It's so nice to see you again! Every new one video of yours is a fiesta!))

[@EPaulIII]

Some years ago I have converted a 6" chuck to make it adjustable. It is a good conversion and I apparently unknowingly avoided the flexing of the chuck body, at least to a large extent. But now, after watching this, I will probably re-visit that to see just how good or bad my design is in this respect. His point about the front of the chuck bowing out, making the jaws "bell mouthed" is a very good one. And his method of reinforcing that is excellent. I mention my experience because, when I say this is an EXCELLENT conversion and video, I want everyone to know that I do speak from experience. Robin has considered and apparently successfully tackled so many more issues that come with an inexpensive chuck. My hat is off to the master! Yes, thank you very much for the excellent conversion and video.

[@ROBRENZ]

Thanks for the kind words!

[@ceesweerheim990]

The effort in detail design and consideration is truly amazing! Thanks for sharing

[@davidandrews8566]

Excellent stuff. Educating and entertaining all rolled into one.👏

[@vliberal]

i love when we have an excuse to over engineer something. thank you robin!

[@aleks138]

ROB is BACK!

[@chrisstephens6673]

You sure know how to make a chap feel inadequate, but as alwsys i forgive you! Keep 'em coming and I'll keep watching and never mind the ego bashing.😂

[@charlieromeo7663]

Well worth the wait, Robin. You continue to impress.

[@d6c10k4]

Excellent!....Glad to hear from you again.

[@KrakenGuy]

Robrenz is a wizard.

[@wheelitzr2]

Even the most experienced machinist will learn something from this video, I learned a ton!!! Thank you!!

[@ROBRENZ]

Glad you enjoyed it!

[@RookieLock]

Fantastic ! Thanks for taking us along for this one..

[@gyrogearloose1345]

Thank you very much for this Rob. Most enjoyable and totally gripping! Wonderful cinematography and piles of mechanical wizard tips and tricks. Your approach to the work is very inspiring. I wish good fortune on all your projects.

[@bigbattenberg]

Re-watching I am getting more and more ideas. I don't really need a set-tru chuck but stiffening the system with two bolt patterns is a game changer IMO. In fact a thing I have been irritated by is the fact that on the chucks I currently use, chips get caught in the annular space between the backing plate and the chuck. It gets worse because the type I have has a keyway. I was thinking about somehow filling up the space with a sealant or something but that would be so permanent it would be a huge hassle when the chuck would need disassembly. Right now I am always taking the chuck off the backing plate when swapping them. Now, I think there is a great opportunity to kill two birds with one stone. First, make a thicker chuck end/ stiffener plate that lines up with the outer mounting surface of the chuck, so there is no shoulder anymore. Then, post-machine the two in assembled condition and add bolt holes as required (for front mounting if that is not already the case). Then, machine the backing plate adding the threaded holes and get rid of the stepped shoulder. Next, mount the to together and indicate on the lathe to run dead center. Take the assembly to the drill and add to conical dowel pin holes. Add dowel pins for future alignment. For disassembly, dowel pins with internal threads may be used for a slide hammer or threaded holes may be added for pressing the pieces apart with screws. When all is done bore the (hard) jaws as is now well known. Notes: - The chuck end/ stiffener plate does not need to be an interference fit per se when the set-tru feature is not added, however I feel that it will only add to the stiffness. The plate may also be fitted with screw holes for push-off disassembly. - Making the end face of the chuck flat will make it very easy. After all making two parts with the same axial dimension on two shoulders is over-constrained by definition, with the set-tru feature it is necessary but pretty advanced skills and equipment are required to do it right.

[@James-fs4rn]

👍So much tech info being shared, had to watch it a few times to keep up as always. Your mechanical wizardry sharing is truly appreciated. Thank you!

[@brandontscheschlog]

On another level. Love it!

[@first_namelast_name4923]

Thank you letting us to look over your shoulder once again. Highly informative video.

[@Julian.Heinrich]

Stellar work, Robin! Thanks for sharing

[@than_vg]

thanks so much Robin, please know how much your efforts are appreciated!

[@joesmith4494]

Thank you for sharing your wisdom. Loved the video

[@wjenkins96]

I’ve watched a lot of your videos that I know I will never be able to do. But cleaning up the chuck for safety is something I should’ve already done. Just pulled my chuck off and got my jaws out to work on that.

[@SpencerWebb]

Awesome job and awesome teaching, Robin!! Thank you! 👊

[@ericmiller5559]

Amazing work Robin. Thanks for sharing your knowledge.

[@907jl]

Thought provoking and educational as always Robin. Thanks for sharing!

[@pierman69]

Impressive as always, thanks for sharing Robin!

[@737mechanic]

Very nice. Always enjoy watching you work.

[@carlkulyk366]

Out of this world machining as usual. Great video Rob, my Buck chucks are jealous.