MAKING ULTRA PRECISION TOOLROOM SPINDLES #2

Thanks for sharing uncle Robin. But please dont make us wait another year for the next part 🥺

[@IGBasov]

just watched at your last video. Great job, nice watches

[@IGBasov]

Greetings from Russia! There are a lot of your subscribers here

[@hereticswissery9010]

Thanks to Instagram crashing I guess :P

[@jFloRED]

Ca Lem. Yeah you don’t make us wait either 🙏😝👌🤞

[@ROBRENZ]

I will try my best

[@matthewhickey942]

Thought I was going to bed but I didn’t realize that today is Christmas. Thanks for the gift.

[@jacorral5788]

*spends hours setting up grinding operations, achieves a parallelism most people only dream of* "Yeah, its a bit conical. But that's ok, it'll get lapped anyhow" Your patience and dedication is incredible, truly a role model

[@oxtoolco]

Ok "rough" grinding complete. Next up the fussy stuff. Awesome as always Robin. Cheers, Tom

[@ROBRENZ]

Thanks Tom, means a lot coming from you! ATB, Robin

[@davidwillard7334]

NO !! NEVER !! TO !! YOU !! EITHER !! YOU !! YOU !! TUBE !! THIEF !!!

[@StefanGotteswinter]

That was cool! Your AutoHarig is such a nice machine, cool to see it in operation. Loved the input about geometry considerations on flat spin grinding, thats a topic completely foreign to me so far.

[@ROBRENZ]

Glad you enjoyed it

[@Watchyn_Yarwood]

I knew you would be here! Your turn, Stefan!

[@Goodwithwood69]

We need to get him back! I miss this level of accuracy!

[@rootvalue]

I love how deeply you discuss the physics of metrology. Truly stimulating, and not too nebulous for a viewer like me.

[@tonyray91]

Once again Robin shows how the seemingly impossible can be achieved. I’ll probably never need to work to these limits but I always learn something during the vid that I can use. Thank you.

[@davidwillard7334]

JUST !! ANOTHER !! YOU !! TUBE !!! THIEF !!! ON ! HERE !!

[@BernardSandler]

I always enjoy your perspective on how a whole system of forces governs the outcome rather than just the interaction between surface and cutting tool.

[@miles11we]

Yeah its interesting when you start realizing everything is somewhat incorporated into the set up, the heat in the air, how much your body weight moves the concrete slab.

[@vpitool]

Robin, I know it's been a while but I sure wish you would continue this series. Your videos are orders of magnitude more interesting and informative than any other KZbin machinist. Sharing your talent and knowledge in this detailed manner is a real gift to the community.

[@ROBRENZ]

Going to try to do more videos in 2025

[@waynepegram3262]

It's a joy to watch someone who truly understands what he is doing ! I think Robin and Peter are so unselfish in sharing their knowledge. Most utube "machinist" are fumbling in the dark and mislead many. Thanks for sharing.

[@DavidBaumgarner]

I am sorry to say I am not familiar with the Peter you refer to. Could someone please share as I would certainly like to fix that situation. (Or you could just give me 100x more Robrenz videos. THAT would be perfect but alas, he is too busy doing real things to do videos full time. heh)

[@waynepegram3262]

@@DavidBaumgarner kzbin.info/www/bejne/i5XEhH2MeLZrpqc

[@DavidBaumgarner]

@@waynepegram3262 THANK You Mate!

[@mykedindeal]

50 years of experience in 1hour.I'v heard things that I will never ever think off.Priceless.Thank you

[@ROBRENZ]

Glad you enjoyed it

[@DERoberts1961]

You are my hero. I am not articulate enough to express how much I enjoy watching you progress through the projects. Thank you.

[@Thudmoto]

Thank you for sharing your knowledge & expertise. I work in a small job shop & anytime an operator complains about me being to "picky" on my metrology, I point them to this channel & let them enjoy the doorway that +/- .005 really is. I love this stuff!

[@ROBRENZ]

Glad to help

[@ShadonHKW]

Always good to hear your insights, 45 minutes well spent.

[@ROBRENZ]

Thanks for stopping by Stan. ATB, Robin

[@joshmyer9]

37:45 This shot is pure joy. Watching the pattern of the sparks go from continuous cut to four very short bursts at the tippy-tips just like the geometry predicts is very, very satisfying. (You can hear it in lathe work, but seeing it in sparks is so nice. Maybe I'm just easily amused.)

[@davidwillard7334]

And ! QUITE !! CLEARLY !! A !! COMPLETE !!! WHACKO !! TOO !!!

[@pablokagioglu2546]

Robin. There aren’t enough words to describe how much I like your channel. Absolutely amazing. I am not a machinist but studied engineering drafting and the mechanics of deformable solids in college, been fascinated with anything that requires mechanical precision ever since. To see you work on design improvements, anticipate process issues and account for all materials deformation is pure pleasure. Keep making those videos, awesome work.

[@ROBRENZ]

Wow, thank you!

[@corbin72]

Hey Robin. I know it's been almost a year from your latest video. Hope all is ok. Just want to let you know that your videos inspired me to continue my education into engineering and deeper into tool making. I have gained an almost annoying attention to detail. My boss has given me so much due to this trait. As in more complex work and jobs along with a huge pay increase and title promotion. If it weren't for people like you in the trade young men like me wouldn't have mentors to guide us to the top. Thank you for being sooooo educational and percise. You don't know how much it means to guys like me in the trade to have these structured lessons. Thank you again for all your hard work.

[@ROBRENZ]

Thanks for the kind words and encouraging story. I hope to get back to doing videos soon.

[@aleks138]

@@ROBRENZ please do. I learn so much from them

[@mlt3258]

Agree tremendously!!!

[@par4par72]

Master Class on fine Toolmaking.

[@cnc-ua]

1 year between parts. I appreciate you finding a time to share your experiences, Robin

[@kimmoj2570]

Found here by Stefans recommendation on his video. Sir, you have excellent YT channel which offer wealth of hard earned knowledge and is enjoyable to watch. Thank You.

[@ROBRENZ]

Awesome, thank you!

[@reidkiser6845]

Hey Robin, I’m a 25 year old self taught mechanic turned machinist. I’ve turned into the go to guy at the company I work for to do most off the tooling/tight tolerance work that we do. I just want to thank you because your channel opened my eyes to elasticity and it has changed my out look on everything. Thanks you for sharing and I can’t wait for the next video

[@davidwillard7334]

WHY ! DO ! YOU ! WANT ! TO ! KNOW ! THEN !??

[@Garthinyus]

Glad to see you back brother! I'm thankful that the Lord has kept you to return!

[@ROBRENZ]

Thanks and yes he has!

[@FCleff]

Honestly, I don't feel worthy to even watch this fantastic video. However, I do feel blessed. Thank you!!

[@ROBRENZ]

Glad you enjoyed it!

[@dylanschmidt4166]

Awesome. You cover so many interesting topics in so much detail, all while giving insight and tips that are unmatched. Thank you for your videos

[@ROBRENZ]

Glad you like them!

[@T1g3rch3n]

As a Watchmaker I'm used to work within what most People think as 'Insane Precision' (± 0.001 - 0.005mm) But those People don't work with Metal and they rarely work with Machinery. By now I am used to think 'Oh Robin is doing ridiculous Precise stuff again' With my grinding work I never have to consider if my machine is growing in size as it warms up, the Change in size won't even show up on my Instruments. I appreciate the Educational Work you do. I've learned so much even for the 'Precision Range' I work with :)

[@vincei4252]

Robin is one of the few guys I'm sure smiles everyday he walks into his shop to go to work. Awesome stuff. I'm glad I don't have anything that can measure to your levels otherwise everyday will be an existential crisis :-)

[@pontoonrob7948]

I think the word "existential " needs to be canceled.

[@tomthumb3085]

Tremendous detail and engineering setup, some great tips on metallurgy and brilliantly narrated. Always a pleasure to watch your videos, thanks Robin.

[@eiserntorsphantomoftheoper2154]

I was a job shop machinist for 15 years. I had a "Dumor" tool post grinder for my South Bend 17" Turnado. A half thousandth was my idea of precision.... You, my good sir, are in a whole other league.... This is fascinating. Thanks for explaining everything so thoroughly.

[@indestructibleinsertman2168]

I had to tell the wife to shut it because Renzetti was on! You could steal the show at IMTS and just setup a booth and sell shirts and take a picture with Robin day. Alway impressed and never disappointed in your content.

[@davidjun4435]

Outstanding video, part 1 and 2. Thank you very much Robin.

[@thebeaver6596]

So funny I just revisited the first tool room spindle video LAST NIGHT! Thank you robin keep it up we love you and appreciate you !

[@ROBRENZ]

Awesome! Thank you!

[@billythebake]

LOL, I did the same thing...

[@vachikl]

I have watched all your videos, it’s a joy , thank you

[@andywharvey]

Really informative and entertaining video, thank you. Your comments around geometry and ensuring your grind is as good as possible to help you finish the parts are spot on. When I was an apprentice 25yrs ago, one of the best engineers I’ve ever worked with told me “the secret to good finishing, is good roughing”. I have always remembered this and it is so true. Keep up the great work, I find your work fascinating.👌

[@ROBRENZ]

Thank you very much!

[@DudleyToolwright]

A tour de force of top notch education. Thank you so much Robin. I am definitely going to have to watch this video several times.

[@ROBRENZ]

Glad it was helpful!

[@bruceanderson9461]

I will never be working to these tolerances but I really enjoy your discussions of what needs to be considered to work at this level of accuracy. Of coarse it starts to influence my work at the tolerances I work at in a very positive way. Thanks for taking the time to video this.

[@slausonm]

I learn from your voice over and get entertained and amazed by the video. Thank you.

[@ROBRENZ]

Glad to hear it!

[@drmadge]

Great video, thanks. Your videos are always packed with experience and insight, and an absolute joy to watch. Look forward to part 3! All the best!

[@ROBRENZ]

Thank you very much!

[@bensthingsthoughts]

Far away is the day we will be able to achieve such precision on our tool and cutter grinder ! But the grinder finish makes for a good illusion of being precise. Best wishes from Switzerland ! I love your videos, packed with informations that I might need, but most likely won't, but that I anyway very much enjoy !

[@elanman608]

What you sat is so true precision is more about understanding and negating the weaknesses of your machines than their basic accuracy, not to say that the job you have done on your grinder is not superb. Another hour of engineering bliss.

[@bryceklippenstein8774]

Thanks for putting the work into these. As someone who only tangentially touches on metalwork, I find these super interesting and useful.

[@Engineerd3d]

Had to wait a week to watch this video in a manner I could concentrate and learn something. Love the automated grinder. Thank you for the effort to make this video Robin.

[@ROBRENZ]

Glad you enjoyed it!

[@mackk123]

Im liking the custom plastic shrouds over the handles

[@BronzeAgePuritan]

I look forward to your videos 10x more than I looked forward to Avengers: Endgame. No, more like 100x.

[@Asaadomar]

Wow. Finally a new treat from mr ROBRENZ. Thanks for sharing

[@homemadetools]

Great work. We shared this video (and part 1) on our homemade tools forum this week.

[@JeffCowan]

I did not realize that fact about the modulus of elasticity not changing. Great video as always!

[@morganmcintire2853]

I remember reading about the effect of tempering on the modulus of elasticity in metals in a compresser engineering report written by Perdue University about compressor flapper valves made from Sandvik 20C 7C27Mo2 and Hiflex. In one of their tests they decided to see how hardening and tempering affected the modulus of elasticity of the parts. They subjected several samples of each material to 12 different tempering treatments and found that affect of H/T on the metals actually affected some slight changes in the anisotropy of the H/T strips but they were relatively small maxing at around 5% Δ so relatively negligible.

[@ROBRENZ]

Thanks for that input!

[@morganmcintire2853]

@@ROBRENZ No problem, Btw I love watching your videos I learn so much about the "Ultra Precision" world every time I watch. My line of work resides in the thousands and ten thousandths of an inch. I've never ventured into the millionths.

[@TheMetalButcher]

Jeff, not only does it not change across temper, but it is relatively constant across steels/ materials of a family.

[@MachiningandMicrowaves]

Fascinating to think about oil film dynamics and wheel loading and column expansion as sources of systematic errors. Always excellent, thanks for being an inspiration.

[@joeldriver381]

Woo Hoo- New video!!!

[@ReubenSchoots]

Robin, Thank you for the valuable insight. A lot learnt. Cannot wait for the next installment on these spindles. Regards, Reuben

[@ROBRENZ]

Glad it was helpful!

[@copasetic216]

I appreciate your videos and your thoughts more than I could ever express. Thank you.

[@cliffordarrow6557]

Pleasure to watch. Like getting the correct answers to a test.

[@HansFormerlyTraffer]

My goodness. What a treat. Thank you.

[@gleaseman]

You're an inspiration Robin, thanks for sharing. 🍻

[@ROBRENZ]

My pleasure!

[@michaelmiller5566]

I think everyone would enjoy a monthly video from you.

[@dazinull]

Haven't got a clue what you are talking about but I'm addicted

[@phillipyannone3195]

Thanks for the great tips Robin, your work is outstanding!😊

[@shiro-r4m]

We have once again been blessed with a video, thanks a million Robin!

[@ROBRENZ]

Glad you enjoy it!

[@cavemaneca]

Finally part 2! Though I'm one to talk about long overdue videos...

[@rowanhoggarth392]

Awesome modified Harig. Really appreciate your precision work 'process' videos, keep up the good work!

[@rhysd5410]

What an absolute joy to watch. This makes me imagine what it might have been like looking over someone’s shoulder in the Moore shop.

[@diegovianavillegas3297]

And now I go to my workshop knowing how far I am from Robin's level. I didn't think about the column growing due to heat...absolutely stunning. I look forward to watch some lapping content in the next video. As always, an awsome job Robin!!!

[@davidwillard7334]

IT CLEARLY ! SWELLS !! UP !! LIKE !! YOUR !. BRAIN !! DOES !!

[@houseofsolomon2440]

I'm a Conn. native & used to enjoy seeing old Bridgeport machines used in local shops. Monolithic juggernauts 👌🏽

[@93Martin]

The long awaited Sequel!! Great stuff Robin. I've watched the first one a half dozen times already, will probably do the same here.

[@davidwillard7334]

GEEZ !! YOU !! MUST !! BE !! CLEARLY !! BORED !! RIGHT !! OUT !! OF !! YOUR !! BRAINS !! HERE !!!

[@motionsick]

Man that's some good looking hardware.

[@robertdebusk6157]

Unbelievable precision and care you have with your grinding processes. Just blows my little mind. Take Care and Stay Safe. Bob

[@davidhughes8539]

Fantastic! I have some weird compulsion to watch these videos immediately. Thanks for taking the time to make the video!

[@ROBRENZ]

Glad you like them!

[@jbrownson]

So amazing how many details there are to this stuff, thanks for posting this

[@matsbengtsson3756]

Love to watch this channel and Stefan Gotteswinter. Real professionals. Thanks Robin looking forward to next video.

[@mxcollin95]

Would bolting sacrificial stock around the square part such that the grinding wheel stays loaded as the square part turns underneath it solve the impulse loading the grinding wheel sees thus allowing for a more accurate grind?

[@miles11we]

I was thinking the same thing but I think the spring passes would also take care of it for the most part.

[@ROBRENZ]

Yes it would!

[@lwilton]

@@ROBRENZ But then you would probably need the sacrificial stock to be the same material and hardness as the base stock, or the difference in tooth on the material would still affect the transitions. :-)

[@paaatreeeck]

Amazingly detailed explanations, this is the channel for advanced learning :)

[@sumguysr]

I hope you're doing okay Robrenz. I've been missing your videos.

[@knurd75]

You are very generous with your knowledge. Thank you!

[@CaskStrength777]

I've been waiting for this forever, woohoo!

[@michaelpiotrowicz6100]

Just knowing such precise work can be done is a joy. Fascinating as always. Thanks

[@warrenjones744]

Before Robin, I never seriously considered thermal growth, micro inches, nano meters, millionths of inches etc... In my daily work if repairing construction equipment bearing and pin bores in the field if I hit may target within a thousandths of an inch with consistency using portable machine tools I am thrilled beyond belief! However if I consider some of this stuff while doing that work, for example the hot noontime sun warming up a frontend loader frame when my setup was done in the shade. It can make a difference in bore size and sometimes alignment. not a big deal in a slip fit for a pin, but a press fit for a bearing or series of bearings it can make a huge difference. Tool rigidity is another topic Robin got me to consider in depth too. Once again with a portable machine tool it's hard to achieve some days. I struggled with this for some years, not knowing why I was having troubles. Robins example and explanations caused me to have another look at this stuff in detail, do my own research and experiments. I have a lot less problems now, especially on sketchy set ups if I think about this stuff in advance rather than chase my tail once I start. Now none what I do has anything to do with surface grinding, but the same rules apply. And even in my day to day machining in the shop, i.e. building a tool, I get better size control and finishes when I think about this stuff. Not really necessary in my world again. But very gratifying to hit a number every time. Thank you Perfesser 🍻 (edit) Oh and I forgot Loctite products, Like many people I have used thread lockers and anaerobic sealers for year. But unfamiliar with some of the other products not knowing what they could accomplish if used correctly and using the right product. Black max comes to mind.

[@ROBRENZ]

Nice to hear these things are helpful Warren! ATB, Robin

[@josiahlevasseur4479]

Unreal, love the detail you go into awesome work rob

[@ke6gwf]

I doubt I will ever have the chance to use any of this, but I really appreciate the detail you put into this art, and you help me understand better the Intricacies of Interactions in systems, which really applies to everything from physics to medicines and herbs, to emotional healing, and you describe it in an easy to understand manner.

[@BernSha]

Adding - That you gave countless hours needed for the mastery of your tools and materials demonstrates a degree of commitment I seldom see, which seeing is inspiring. Sharing this commitment is, in my view an act of service. Bringing this kind of heart is applicable to any endeavor and, at some point, begins to reveal the underlying connections between all things. In that, we are all walking this path together. Thank you for letting light shine!

[@first_namelast_name4923]

I am very unlikely to operate a proper flat or cylindrical grinder in a future. (Well, I have built something in my small home shop that I am calling a grinder, for lack of better name.) Yet, I think I have lust learned a lot of very, very useful stuff and bunch of cool tricks. Thank you taking your time and slowing your work down for us to learn from you.

[@MrJugsstein]

Thanks Robin always so cool watching your plan and execution

[@alexcroteau8726]

Great video Robin, really appreciate all the over the shoulder talk at the grinder. Lots more to think about and consider now since every bit of info for toolroom grinding is coveted. The grinder looks awesome too, that silplat looks like the ticket. Cant wait to see what's in store for the other two machines! Cheers Alex

[@ROBRENZ]

Glad it was helpful!

[@valentinozangobbo]

I was waiting for this to come out one of these days! The premonition signs made me watch previous episodes yesterday :)

[@Ideasite]

Masterful, Robin. Thanks as always.

[@ROBRENZ]

Thanks for listening

[@wolfy9005]

Meant to be studying, saw this vid, definitely worth the hour. Always stuff to learn, even though I'm not a machinist.

[@justinpatterson7700]

im very excited for the hard turning, that has always fascinated me. it's amazing how we can cut hardened tool steel like that.

[@tgirard123]

That was so fascinating. My uncle was a tool and die engineer at GM and then opened a grinding service in upstate New York. I remember being in his shop and not understanding anything he was doing. I like to think he was doing work similar to what you're doing. Just fascinating how so many variables come into play to hold those tolerances. And those finishes, holy cow.

[@RookieLock]

I love the work you put into your surface grinder ! Beautiful work as usual Robin. Cant wait to see more!

[@dariushmilani6760]

Robin, you are truly the badass precision king. Keep up the high standard.❤👍

[@bkoholliston]

Just amazing! Your work, your skill and knowledge: just amazing.

[@ROBRENZ]

Thank you very much!

[@TonberryV]

Absolutely brilliant. This is the sort of thing I wished for in tech school, just getting excitedly buried in the weeds and hoping to retain a fraction of it all.

[@timmer9lives]

Thanks for making this video. As always...really great stuff.

[@ROBRENZ]

Glad you enjoyed it!

[@IGBasov]

long awaited video! Thanks Mr. Renz

[@gwharton68]

Glad for the update. Was wondering if there would be more. Thanks for all the work.

[@captcarlos]

Glad you are well. Another class cram packed with information. Thank you master.

[@ROBRENZ]

Very welcome

[@bliesneb]

Sir Robrenz, I love your videos!

[@ROBRENZ]

Glad you like them!

[@tsviper]

Thanks for sharing Robin. Your work are amazing

[@Idontrunntoofast]

Really cant wait to see the next part of this series! :-)

[@MegaCountach]

Beautiful work Robin, thanks for details, cheers, Doug

[@randr10]

Trying to indicate something in within a couple thousandths is a struggle on the equipment I'm using. This is just amazing to see you dial these parts in to a thousandth of that. It's difficult to wrap my head around the magnitude of that.

[@bartharkemametalworks2299]

Another great video! Thanks for taking the time to make this. I just re-listen to the podcast for within tolerance yesterday and was wondering about the next spindel video. So great timing ;-). And again a inspiration to improve my own work.

[@ThomasJeppesen]

Thanks for all your hard work making these fantastic videos, Robin! I enjoy them so much, and have learned an incredible amount from them. As opposed to many other YT machinists, you keep everything relevant, without too many eh's and uhm's, and you never fail to amaze me in the way you consider all perameters and details. Also very impressed with the creativity with which you set up a project. Love it! I've almost finished watching all your videos, so I'm wondering when you will upload more? If needed, I will watch them all again.