CENTERLESS GRINDING ON THE SURFACE GRINDER

A quick and dirty setup to centerless grind some pins on the surface grinder.
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I am "robinrenzetti" Instagram lots more content there!

[@crtv5]

Rob says "... plus or minus a tenth - nothing crazy." LOL! Maybe not for you! Great video.

[@DrKnow65]

That stuck me too... "Nothing crazy"??!?

[@ROBRENZ]

Easy with awesome machines and measuring tools. Thanks and thanks for watching and commenting!

[@duobob]

Just a quick setup... Based on a lifetime of watching and learning and paying attention! Very nice, Robin!

[@ROBRENZ]

Thanks Bob and thanks for watching and commenting!

[@arsanzic8592]

That may be the best thumbs up to thumbs down ratio I've ever seen on a video (1102:1). You're obviously very skilled and knowledgeable, and I love learning from people like you. Thank you!

[@ROBRENZ]

Thanks At for your kind words and thanks for watching and commenting!

[@jacquesplante9287]

This is a good example of thinking outside the box for problem solving Thanks

[@ROBRENZ]

Thanks Jacques and thanks for watching and commenting!

[@rupertpowell]

Two things you mentioned that I would like to know more about. 1) Tig induction hardening 2) Roundness measurement. Every video you do makes me want to learn more. Your knowledge is boundless....many thanks for sharing it with us all.

[@inmyshedwithbc.]

This is not induction hardening as there is no coil. It is electric arc hardening.

[@rupertpowell]

I still would like to know more about it.

[@ROBRENZ]

I did say "sort of" induction hardening with the TIG. I used induction implying a surface only hardening. Obviously the only induction involved is in the saturable reactor transformer in my old school Tig machine. I will do a follow up video but it is just heating the surface with the tig to bright red while trying to not actually melt it. The cooler base metal chills the A2 fast enough to get glass hard. Thanks for watching and commenting.

[@btullis99]

Tool maker for 15 years. Just learned something new and really interesting. Nice work.

[@ROBRENZ]

Thanks btullis99 and thanks for watching and commenting!

[@user-yp9pc3rh6k]

Alot of people think centerless grinding is like voodoo... Not so much. Thanks for an enlightening discussion of methods!

[@ThisOldTony]

excelente!
that's german for 'excellent!'
please explain 'induction hardened with tig' that really perked my ears up.

[@StefanGotteswinter]

I am not sure about your german ;)

[@Swag-sw2li]

Da Zweifel ich auch (said the Ami)

[@Volcker1929]

I am pretty sure all german words are at least 50 characters long.

[@ROBRENZ]

Thanks Tony, glad you stopped by. I am not sure about your linguistics but your videos are awesome! I did say "sort of" induction hardening with the TIG. I used induction implying a surface only hardening. Obviously the only induction involved is in the saturable reactor transformer in my old school Tig machine. I will do a follow up video but it is just heating the surface with the tig to bright red while trying to not actually melt it. The cooler base metal chills the A2 fast enough to get glass hard. Thanks for watching and commenting.

[@ThisOldTony]

gotcha. You gave me visions of wrapping the steel in 4-5 turns of tig torch wire! looking forward to your next vid. Thanks again.

[@StefanGotteswinter]

Very elegant setup there, Robin.
While we have a centerless grinding setup at work for the surface grinder, it would not have been able to do the job you showed, as it has a pressure roller from the top.
Thank you for sharing! :)

[@davidlawrence8085]

I have heard somewhere that in europe there are many more small centerless grinding devices than is USA I want to find out more about them...... Right now I cannot visualize a topside pressure roller setup....was the unit in your shop a shopmade prototype or a commercialy produced unit ?

[@ROBRENZ]

Thanks Stefan, I have making that style of centerless unit on my list because it is also very handy. Thanks for watching and commenting!

[@ROBRENZ]

St Mary's Spin roll has been around in the US forever asmfab.com/product-lines/st-mary-spin-rolls

[@alexkern9134]

Hey Robin,
That grinding fixture is awesome. Quite obviously, necessity is the mother of invention. As always, lots of little tips throughout the video, even the tubing to drive is quite simple but not so easy to think about.
Thanks for the video,
Alex

[@ROBRENZ]

Hey Alex, thanks and thanks for stopping in!ATB, Robin

[@csquaredvisionsfpv8964]

This was awesome thankyou. These types of discussions are hard to find for young guys running old machines, really appreciate the effort!

[@ROBRENZ]

Glad you enjoyed it!

[@GuyBarry1]

I am simply delighted that you are back after your brief hiatus Robin. The quality of your work is inspirational, love it.

[@ROBRENZ]

Thanks Guy and thanks for watching and commenting!

[@leonardzielewski2744]

Hands down the best on CZcams. Knowledge, discipline, attention to detail are 2nd to none. Plus, the way you explain things; I understand what you’re selling. Thanks man🤙

[@ROBRENZ]

Thanks for the kind words, glad you enjoy the content.

[@cflocker]

Thank you for another great video. The depth of your knowledge and the quality of your work is exceptional.

[@ROBRENZ]

Thanks cflocker and thanks for watching and commenting!

[@moeszyslack4676]

Not only are you a true craftsman, but you're one hell of a smart man Robin. Though I'm unlikely to ever encounter this situation or use your solution I can and certainly do appreciate how you went about this. Great video, a joy to watch and learn.

[@ROBRENZ]

Thanks for the kind words Moe and thanks for watching and commenting!

[@dougstrong3272]

This is what is fun about machining, inventing all kinds of neat things.
thank you rob

[@ROBRENZ]

I agree Doug. Thanks for watching and commenting!

[@Beanpapac15]

How have I missed this channel? I think I found what I’m gonna binge watch over the rest of the holiday.

[@r777w]

Another fantastic video. I can't get enough.

[@ROBRENZ]

Thanks again!

[@RGSABloke]

Robin, I have few words here - awesome. Many thanks for sharing your vast experience and skills. Kindest regards. Joe.

[@ROBRENZ]

Thanks Joe and thanks for watching and commenting!

[@ShadonHKW]

That was great Robin, I always learn something from you.

[@ROBRENZ]

Thanks Stan and thanks for stopping by and commenting!
ATB, Robin

[@paulbuckberry7683]

I love it when I watch a short video like that and learn a whole lot of things I didn't know. Thanks for sharing.

[@ROBRENZ]

Thanks, and thanks for watching and commenting!

[@Critical_Path]

Like Quinn says, you are "not of this world".
Incredible content. Thank you so much for sharing what goes on in your head. It's a treat.

[@johns208]

thank you for showing the versatility of the surface grinder.

[@ROBRENZ]

You are welcome John and thanks for watching and commenting!

[@eddiekvh]

thanks for taking your time to record, edit, upload and share your experience with us.

[@ROBRENZ]

Thanks You are welcome Eddie and thanks for watching and commenting!

[@dougp3841]

Outstanding! I love the fact that you adopted such a simple, yet complex, engineering solution to reduce all that potential labor. This is the kind of problem, ideation exercise and solution mapping result that should be experienced by engineering students and skilled trades folks alike as they develop. The results speak for themselves....so my hat goes off to you Sir for a well thought out experience based risk taking exercise! Congrats on getting things out the door correctly faster by adopting a more optimal approach.

[@ROBRENZ]

Thanks for the very kind words and glad you are enjoying the content.

[@Ujeb08]

Beautiful! So quick and simple! A well thought out solution. Thanks Rob!

[@ianjoubert7505]

Thank you Robin, for taking the time, and sharing your knowledge!!!!

[@ROBRENZ]

You are welcome Ian and thanks for watching and commenting!

[@neffk]

I would be interested in hearing more about hardening parts locally with a TIG torch.

[@davewilliams6172]

Me too!

[@wolfy9005]

Thirded

[@onewheeler]

Phenomenal video, I'm filing that away for later. Perfect amount of detail and explanation, too. Thanks for sharing!

[@ROBRENZ]

Thanks onewheeler and thanks for watching and commenting!

[@cdbflynow]

Wonderful solution. This is an example of first rate engineering plus some street smarts (the superglue).
Keep up the outstanding work.
Paul

[@ROBRENZ]

Thanks cdbflynow and thanks for watching and commenting!

[@James-fs4rn]

superb tool making! nice to see the old school, out of the box thinking and problem solving. so many want to rely on cnc for everything. thanks for sharing!

[@ROBRENZ]

Thanks James and thanks for watching and commenting!

[@StraightThread]

Fascinating insight into solving an interesting problem, Robin. Thanks for taking the time to share with us.

[@ROBRENZ]

Thanks Richard and thanks for watching and commenting!

[@jimmilne19]

Super solution and excellent video. I learned a lot. Very creative and practical.

[@ROBRENZ]

Thanks Jim and thanks for watching and commenting!

[@Lemurai]

I’d recommend any engineering major get a machining cert as well, especially mechanical engineering, idk maybe it’s just me but it has served me well on personal projects.

[@matter9]

Really cool, as always learned a lot! I also like how you seem to approach parts from perhaps a different perspective than other machinists on CZcams, strength through diversity!

[@JBFromOZ]

Awesome! Keeping my ears open for things I can do with my surface grinder

[@ROBRENZ]

Thanks JBFromOZ and thanks for watching and commenting!

[@cobrabuilder9336]

Excellent Video! The way you describe the thought process to come up with the solution is what sets you above the others.

[@ROBRENZ]

Thanks CobraBuilder and thanks for watching and commenting!

[@bvukovar]

Thank you so much for this fantastic video! I'm in the middle of rewiring a Reid 6x12, and now I can demonstrate to my boss that I can create not only precise flat, but also cylindrical surfaces! I love learning from your videos, they are all amazing!

[@ROBRENZ]

Thanks bvukovar and thanks for watching and commenting!

[@TheAlfieobanz]

Love your vids Robin. I'm going to need more. Your machinist power level is over 9000...

[@ROBRENZ]

Thanks TheAlfieobanz and thanks for watching and commenting!

[@manusholm3536]

please show some of the induction hardening with the tig torch

[@niltonpolydoro1]

Very nice idea! Congratulations.

[@ROBRENZ]

Thanks Nilton and thanks for watching and commenting!

[@slausonm]

Love the problem solving aspect of this. Thank you

[@ROBRENZ]

Thanks slausonm and thanks for watching and commenting!

[@TechGorilla1987]

Great to see another video from you!

[@ROBRENZ]

Thanks, its good to be back and thanks for watching and commenting!

[@sblack48]

I always wondered how centerless grinding worked. Thank you.

[@ROBRENZ]

You are welcome Scott and thanks for watching and commenting!

[@REDRIDER101]

Killer dude! Super simple set up and fixture. Fixturing master right here.

[@ROBRENZ]

Thanks AHM5 and thanks for watching and commenting!

[@nightriderrv1139]

That was great work taking nothing like a block of steel and making something that works and gets the job done. That was a very good finish.

[@ROBRENZ]

Thanks Mark and thanks for watching and commenting!

[@joeldriver381]

You and Stefan provide the important details... Thanks for teaching us!

[@ROBRENZ]

Our pleasure!

[@loydsa]

Thanks for the excellent video Robin

[@thetrevor861]

Brilliant, elegant, simple, effective.

[@ROBRENZ]

Thanks The Trevor and thanks for watching and commenting!

[@ShawnColorado]

I found your page through a recommendation by Stefan Gotteswinter on his channel. Wow, was I glad he directed us towards your channel. I am very impressed with your way of explaining your ideas and thoughts. I am sure I will be able to learn much from your videos. Thank You.

[@ROBRENZ]

Thanks Shawn and thanks for watching and commenting!

[@jrod4538]

As a retired Tool / Mold Maker I definitely appreciate the time you’ve taken to make these videos I’ve learned a few things from you and have a few things I would be happy to share. Keep up the great work👍👍🤙

[@ROBRENZ]

Please share, I learn something new every day.

[@markwentland3147]

very clever idea Robin

[@prafullarwade]

Such a simple but great & efficient idea.. cool

[@kennethjanczak4900]

Really nice.....
Thanks for sharing this little great trick, and taking the time to make the video and share

[@billchiasson2019]

What a genius idea!,,thanks for sharing this method!!.

[@robincox8902]

An amazing man" so fantastic to be able to have highly qualified men like yourself in my machining learning curve. Keep em coming many thanks for sharing. Regards Robin cox,, U.K.

[@ROBRENZ]

Thanks Robin for the kind words and thanks for watching and commenting!

[@BobJones-cr1pl]

FINALLY......A pair of hands that look like mine!

[@scottmuller1901]

Great videos, like others have said , I needed to find your videos back when there was no you tube! Keep up the great work !!!! Thanks

[@bertr5650]

Great idea. Thanks for sharing.

[@frankmuller5649]

Simple, ingenious and interesting... I'm still trying to wrap my head around the required angles (offsets) to get round parts and why. Fascinating problem solving and "shoe center less", didn't even know that existed... but hey... I got you as a teacher... thank you for sharing... great video... very useful topic!

[@ROBRENZ]

Thanks Frank and thanks for watching and commenting!

[@jeffanderson1653]

That's very interesting. I'm always looking for ways to be more creative with my equipment. This video adds to the tool box.
Thanks for this! You Da Man!

[@bcooo1]

Very cool fixture that you have come up with.

[@basildouglas855]

Excellent solution to a difficult problem

[@tomthumb3085]

Brilliant. A very clever solution to a seemingly impossible problem. You nailed it perfectly. Thanks Robin.

[@starbolin]

Great little note..opened up some possibilities for me in my tiny shop. Just the right level of explanation for me. Quick and concise.

[@billdlv]

Very interesting Robin, would like to see more about hardening with TIG

[@ROBRENZ]

I will do a follow up video but it is just heating the surface with the tig to bright red while trying to not actually melt it. The cooler base metal chills the A2 fast enough to get glass hard. Thanks for watching and commenting!

[@ReubenSchoots]

Brilliant. Thanks for sharing! - Watchmaker from Australia.

[@ApukEldar]

Excelent! Thank you Robin.

[@ROBRENZ]

Thanks Apuk and thanks for watching and commenting!

[@philhawtin5269]

Thanks for doing this video, I was not aware of what centerless grinding was exactly. I appreciate it.

[@kglesq1]

Elegant, brilliant, effective, etc. (as usual). Thanks for sharing.

[@ROBRENZ]

Thanks and thanks for watching and commenting.

[@Volcker1929]

Interesting setup. I would love to hear more about hardening with the TIG torch.

[@ROBRENZ]

Thanks Volker1929, I will do a follow up video but it is just heating the surface with the tig to bright red while trying to not actually melt it. The cooler base metal chills the A2 fast enough to get glass hard. Thanks for watching and commenting.

[@jeremydoblinger3609]

This work holding and being able to grind like this an a regular grinder is very cool!! Great engineering here Robin! Thanks for sharing very motivating for me.

[@ROBRENZ]

Glad you like it!

[@jesscneal]

Really neat solution. Looks like it worked great.

[@ROBRENZ]

Thanks and thanks for watching and commenting.

[@BasementShopGuy]

Incredible. Love this next-level stuff, Rob!

[@ROBRENZ]

Thanks Brad and thanks for watching and commenting!

[@metlmuncher]

Very nicely done! I'll be tucking this away for a rainy day.

[@ROBRENZ]

Thanks Adam and thanks for watching and commenting!

[@thedraac1818]

Very nice setup. Great information.

[@ROBRENZ]

Thanks and thanks for watching and commenting!

[@TheWidgetWorks]

Nice! I was thinking of rigging up a center grinder setup for my tool and cutter grinder. Now I have a better idea I think I'll go with the shoe style for my first try. This was a very informative video, Thank you!

[@ROBRENZ]

Thanks and thanks for watching and commenting!

[@forrestaddy9644]

Clever dude. I got lots of set-up fans run time on centerlesses and I've been Dow the road with lobed parts so I can appreciate your adaptation and explanation..
Never heard is the "shoe" trick but I admired your application.

[@ROBRENZ]

Thanks Forrest, take a walk through a ball bearing plant and you will see hundreds of shoe centerless setups doing races. Thanks for watching and commenting!

[@shantk7378]

Such a wonderful channel.

[@danielwerger5641]

Very cool Rob, thank you...!

[@ROBRENZ]

Thanks Daniel and thanks for watching and commenting!

[@aaronholstrom1971]

Great tool. Great idea. Love the content! Thanks for sharing your knowledge with us.

[@ROBRENZ]

Thanks again Aaron and thanks for watching and commenting!

[@tonywilson4713]

I love watching your videos.
Its the way you think and approach and solve problems based around *fundamental principles.*
I keep telling other engineers that we are forgetting our fundamentals and relying on technology too much. Where its most obvious is in problem solving. The entire Max-8 fiasco was problem solving exercise where they just forgot some very basic fundamentals about sensors and control systems like the very basic fact that sensors can fail.

[@peteferguson7024]

Your solutions are always interesting, thanks for sharing.

[@ROBRENZ]

Thanks Pete and thanks for watching and commenting!

[@aubreyaub]

"Induction Harden with a TIG torch". ???????? Nice work Robin, but love to know about the hardening.

[@ROBRENZ]

Implying a shallow hardening by bringing just the surface to hardening temperature and quenching. In this case holding an arc with the tig torch just enough to do that without melting the metal. The only induction involved here was the tig welder transformer ;-)

[@Redmech80]

That was cool. I’m building a hole machine shop and I love seeing different ways to skin a cat. Thanks for showing.

[@ROBRENZ]

Thanks, and thanks for watching and commenting.

[@tailormachineworks281]

Thanks Robin that was very good. Much appreciated.

[@ROBRENZ]

Thanks and thanks for watching and commenting!

[@SUNEELKANDA]

It's a great idea,
I loved it enjoyed every detail discussed about it...
I'll try and make one to check,
I do grinding some of my jobs with v blocks attachment I've made for my needs....

[@michaelfiller3452]

Another great vid, love your thought process, and clear, concise demo. Thanks!

[@ROBRENZ]

Thanks Michael and thanks for watching and commenting!

[@turningpoint6643]

A whole lot in this I hadn't known about centerless grinding rests and a more than clever solution to not having a centerless grinder to make things easier Robin. I'm not sure a full build video for the part rest would be needed anyway. It's already pretty clear what's there.

[@ROBRENZ]

Thanks Turning Point and thanks for watching and commenting!

[@EmmaRitson]

always learn lots. thanks for another great video.

[@ROBRENZ]

Thanks Emma and thanks for watching and commenting!

[@bobolander]

really enjoyed the problem solving - very cool!

[@ROBRENZ]

Thanks bo and thanks for watching and commenting!

[@glennfelpel9785]

Inspiring! Thank you.

[@ROBRENZ]

Thanks Glenn and thanks for watching and commenting!

[@TroubledTimes2024]

What fantastic out of the box thinking Robin!

[@ROBRENZ]

Thanks Ken and thanks for watching and commenting!

[@robertengl9152]

great real world solution! Love the idea and the video. Thanks

[@ROBRENZ]

Thanks Robert and thanks for watching and commenting!

[@Herbster472]

Thanks for sharing this technique Robin. Yourself and Edge precision are my favorite CZcams channels for exactly this kind of content!

[@phillipmcintosh6489]

I agree, 2 humble guys with incredible knowledge as opposed to the usual "egos, bravado & hype" types.

[@marinemtrt]

Wish I found your channel years ago. This is what machining and industry is missing. Genuine ingenuity to solve a problem with the tools on hand. I look forward to watching the rest of your videos

[@hideyourcables]

that is next level. thanks for sharing!!

[@ROBRENZ]

Thanks hideyourcables and thanks for watching and commenting!

[@mxcollin95]

Wow. Love the ingenuity! Awesome problem fix. 👍

[@ROBRENZ]

Thanks and thanks for watching and commenting!

[@Nyson]

ROBRENZ can I ask what pen you used to draw with?

[@ROBRENZ]

That is a Kuru Toga pencil with 2B Ainstein lead

[@RRINTHESHOP]

Very nice idea and great execution.

[@ROBRENZ]

Thanks Randy and thanks for watching and commenting!
ATB, Robin

[@douglaslodge8580]

Absolutely a great segment, I am so glad Tom brought you to light for me.

[@ROBRENZ]

Thanks Douglas and thanks for watching and commenting!