MAKING A BETTER ADJUSTABLE TIR LATHE CHUCK

Thanks for the video. Hopefully I'll be able to make one of these. It will be interesting to see if the design can scale down to 4- or 5-in chucks. BTW, I've always heard Euler pronounced "oiler".

I see the screen on your HP48 is bleeding like mine. The defect is progressive and the spot grows slowly, but the calculator is still kicking at 30+ years old

Impressive as always, thanks for sharing Robin!

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

NEXT LEVEL!!!!

Did you consider adding Belleville washer on the opposite side creating the same pressure as the screw to use only 2 adjusters?

Shars has a reputation for being the best of the chinese import stuff. i noticed your using a shars test indicator. how much use has it gotten? holding up well?

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.

Robin, how did the ultra precision spindle work out?
Are ya gonna leave us all hanging?
Please, we'd like to know what happened with that project.
Thanks! 😊

Very nice. Is there any advantage of a 3 jaw over a 4 jaw scroll chuck? Dan Gelbart seems to only use 4 jaw chucks since they can hold square work in addition to hex.

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!

I am going to order one of each from shars, chuck, adapter, and test indicator just because I saw it here. I see therefor I do.

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.

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.

Blaa Blaa Blaa

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

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!

Awsome! Thanks Robin.

i wonder how much wobble improved. how much are you getting over 10" now?

Lost me at “this share Chuck is high quality”

Amazing work.

The teflon tape with the pressure lube. Did you cut the teflon like a washer shape?

Was watching your videos! Very impressive to say the least. Keep up the amazing work, thanks!

Wow nice modification hoe much would you charge to do this to a 8” Chuck?

Robin must get tired of NASA and SpaceX constantly sending him offers…

Why do some chucks only have one pinion gears and others have three ? And which one is better? The ones with only one pinion seem to have the adjust thru.

Love the chuck..... I would like to know how many hours you have in it

are you ok robrenz? been quiet for so long

Watching this for at least the third time. Received a TMX six jaw chuck for our Hardinge lathes at work yesterday and was disappointed to find that it is just about as much a chuck 'kit' as the Shars chuck, but at multiples of the price. The quality of the deburring especially is shockingly poor - raised edges around pretty much every hole, very uneven chamfers on holes, not to mention dents in the back plate face that bears on the chuck body from where somebody tightened the two together with chips stuck in between. The upside is that I had a great excuse to tear it down, and since I have to modify an adapter plate for it anyway I might as well give it a bit of the Robrenz treatment while I'm at it. If only I had that beautiful rotary grinding setup or a dozen or so fewer open projects so I could think about making one.

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

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!!

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.

Please post more !

Hello Robin, my comment is not specific to this video. I just wanted to thank you for sharing your knowledge and especially your thought process during your projects. When I first found your channel (Stefan Gotteswinter recommended you) I basically did not understand anything you explained or did ... it just was way to advanced for me. Well the virus caught me and I bought a lathe, mill, surface grinder, d-bit grinder, and lots and lots of tooling. Basically watched all the videos from Stefan, Tom Lipton, Joe Pie, This Old Tony and so on (sure I forgot some channels) and then again stumbled upon your videos and finally managed to understand most of what you said. Its a real pleasure to watch your videos and I learnt a lot by doing so multiple times ... even if machining is just a hobby to me it has become an important part of my life for me and thats mainly because of you and Stefan. I think you are improving the life of a lot of people. Keep on turning :-), ATB Stefan

Buck chucks are good tools to have. I have seen the distortion you have shown, my approach has always been to loosen all the adjusting screws and move only the one I need to move it in the direction I needed it. Then loosen it again and adjust the others as necessary until I get it running as needed. Always loosen them after adjusting them. Once the chuck is adjusted where it needs to be I snug up all the screws, one side then the other mindful to be deliberate to not skew the results.. Do this to secure the chuck in position being careful to avoid distorting the chuck while maintaining the concentric adjustment. Done it this way for the past four decades I machined and always teach others this method. This method works well and is quick. Nice chuck you have masterfully built thank you for the video.

New subscriber here got put onto this channel via @StefanGotteswinter... Great content and Prost from Germany!

Chuck, my pimp. I had to say it. Awesome video Rob. Thanks for sharing.

I love your channel; “everything is made of rubber”. (Perfectly square, absolutely flat, nothing more accurate than, always is, never is, EVERYBODY knows, NOBODY can know.) and yet you can measure the curvature of the Earth on your surface plate in your garage.
As a surveyor anything more than 100 feet the curvature of the Earth is important. Like is your bed on somebody else’s property? We can not except the fact that flat and level are “NOT THE SAME” !!!

Everything ok, Rob?

Miss you

Thanks a lot for share this,

Merry Christmas to You Robin and your Family!

Sweet. I love the chasing of microns (sorry I am a metric addiction)

"Foresight beats hindsight by a damned sight."
I'll need to make sure that I pick a suitable moment to roll that one out for the first time. I'm hoping to make it to at least the end of today.

I first heard one of my favorite phrases a few years back; from Stefan - though I'm sure others have used it too: "Giving it the Full Renzetti."
I can think of no higher compliment to anyone who makes or improves a tool! Thanks for taking the time to show amateurs like me just how excellent the toolmaker's art can get with years of practice and careful thought.

When are you going to treat your viewers with a new suprise?

Hey Rob, give us an update on your health and the precision spindle. Miss your content.

Hi, Great work man, All the best of the best