ROBRENZ TOOLROOM TIP #2

#practitioner_of_the_mechanical_arts
A modification to a standard grinding wheel hub to allow precise gripping of superabrasive wheels after indicating in the wheel OD. And a indicator protector to directly indicate on the abrasive surface of the wheel. A how to on dressing super abrasive wheels with Molybdenum rod.
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brs_workshop • 16 hours ago
“Shop Notes”*
• Making a grinding arbor nut
• Adding spring steel to a dial test indicator for alarger surface
• (5C) collet held backstop in the lathe with the chuck on
• Tapping head is a SPV (Spintec) SA-0E. I can't find the model on their website.
• 3M 467 Adhesive Transfer tape:
McMasterCarr (60yd): www.mcmaster.com/#adhesive-tr...
Amazon (.5 in/20yd): www.amazon.com/dp/B007Y7CQ1S/
(other sizes): www.amazon.com/467MP-Performa...
3M's website: www.3m.com/3M/en_US/company-u...
• Indicating in
• Tip about aligning to your spindle for good repeat concentricity.
• Opening a dressing a diamond wheel with dollar store sharpening stone and a stick of moly(dinum?)
*Not affiliated with any manufacturer or supplier.

[@tesladrummer]

“Shop Notes”* • Making a grinding arbor nut • Adding spring steel to a dial test indicator for alarger surface • (5C) collet held backstop in the lathe with the chuck on • Tapping head is a SPV (Spintec) SA-0E. I can't find the model on their website. • 3M 467 Adhesive Transfer tape: McMasterCarr (60yd): www.mcmaster.com/#adhesive-transfer-tape/=19s264m Amazon (.5 in/20yd): www.amazon.com/dp/B007Y7CQ1S/ (other sizes): www.amazon.com/467MP-Performance-Adhesive-Transfer-0-125/dp/B00P26Z04I/ 3M's website: www.3m.com/3M/en_US/company-us/all-3m-products/~/3M-Adhesive-Transfer-Tape-467MP?N=5002385+3293242532&rt=rud • Indicating in • Tip about aligning to your spindle for good repeat concentricity. • Opening a dressing a diamond wheel with dollar store sharpening stone and a stick of moly(dinum?) *Not affiliated with any manufacturer or supplier.

[@OGJuggernaut]

Robin, your knowledge brought to this community will outlast generations. The way your brain is geared is something to be admired, and your attention to detail is flawless. Thank you my friend!

[@ROBRENZ]

Wow, thanks

[@TechGorilla1987]

Any day you learn something, it's a good day. Any day Robrenz teaches you, you get a degree.

[@JohnHawkins92]

I love seeing that you've posted on KZbin! Your Instagram is great, but it's nice to see everything in such depth. Thanks for posting. 👍

[@ROBRENZ]

Glad you like them!

[@anthonyjones657]

Was going to say the same thing!

[@FCleff]

"A problem well stated is a problem half-solved". I think that's why I find your videos so educational/helpful/inspiring/enjoyable. Thank you.

[@ROBRENZ]

Great to hear!

[@copasetic216]

You are a great teacher. The way you explain things, just enough detail without beating the dead horse. Thanks.

[@jomgelborn]

I wish there was enough Robenz content to watch 24/7

[@erickieffer8440]

Me too, but then I just rewatch the previous ones too.

[@dannymaciejewski]

Just keep watching the old ones!!!

[@kglesq1]

Thanks Robin. Most of your work is on a level totally inapplicable to me, but I still enjoy and learn from every minute of it.

[@jhueth3969]

1st... maybe. Lol Another great video. Took me a few years to learn all the tips you just went over in a 15 min video. Would’ve saved me some time watching this first. 👍

[@ROBRENZ]

Second!

[@capnthepeafarmer]

I love these little bite sized toolroom tips!

[@manusholm3536]

i often use a feeler gauge blade to "bridge "when indicating. very nice and as always loaded with learning

[@907jl]

Hi Robin, hope this finds you doing well. Can't thank you enough for sharing this info! I need to grind the carbide feet on an indicator stand I built, and just purchased my first diamond wheel to do so. Your video is going to be incredibly helpful in setting up the wheel properly. The tips on the arbor nut set screws( and spacers ), and the spring stock for the indicator probe are priceless!

[@keithhansen3963]

Thanks Robin, Ive had a Hardinge toolroom lathe for ever and never thought to leave the collet closer in for use as a stop. Unbelievable that I've never known that trick. You never stop learning in this trade. Thanks for sharing

[@mikemorgan5015]

We used a similar multi-point jacking bolt on some specialized equipment that needed huge holding forces, but had no room for standard wrenching and torque that would be required with a standard bolt. Did the math and found to get equivalent torque on a standard bolt, we'd need a 17foot cheater bar. With the super-bolt, a 6in long hex key was enough to get the same result. Amazing.... I always learn something fascinating when I watch one of your videos. The spring steel "pad" alone is pure gold. Keep up the great work.

[@ROBRENZ]

Thanks and correct, I didn't invent the idea I just applied it in another application.

[@mikemorgan5015]

@@ROBRENZ I didn't mean to imply that you were implying that you were the first to use this. Simply to discuss the incredible amount of force this method produces. I'm not a machinist, but love the craft. Of all the amazing things I've learned here, the one I most often use is Goop thinned with toluene.

[@bob5074]

You are the capo di tutti i capi of the KZbin machinists community. You should have 2 million subscribers...

[@fefifofob]

It may be a small thing, but I appreciate knowing where a video is going before watching it for 15-30 min. Thx.

[@peterfitzpatrick7032]

Thats why there's a description section... 😎👍☘🍺

[@ThisOldTony]

great video!

[@ROBRENZ]

Thanks Tony. ATB, Robin

[@anthonyjones657]

Bout time for you to drop a video. I smell a collaboration. Maho? Make a super tight tolerance vice for the maho. Maybe a hydraulic vice. I really appreciate both of you guys. I wish i had equipment at home to make videos

[@BossWelder81]

New Renzetti vid -> smash like button. (same on instagram) I don't even do any surface grinding but every time you speak I learn like 10 things and it is very appreciated. Your work is probably out of my league, but watching your setup workflow and problem solving approach is highly informative. Thanks again Mr. Renz.

[@ROBRENZ]

Awesome thank you!

[@tonyray4203]

Thanks Robin, recently bought a wheel like this and have yet to try mounting it, you have highlighted the problems I'll face and given me some solutions. Much appreciated, looking forward to tip #3.

[@ianpendlebury3704]

I always learn something from an R.R. video. Thanks for taking the time to make all of these videos.

[@bobsmith6271]

Robin, thanks for another great video, I really like this style. The long form videos are great, only downside is sometimes I want to show a technique to a coworker and can't remember where you showed it. You're also the reason we have a Harig surface grinder and D-bit grinder. One question-you come up with very creative ways to work around not having a tool changer VMC, but wouldn't it be easier to get even something small like a Minimill? It wouldn't replace the ProtoTrac for big stuff, but it sure would make life easier for all the spot/drill/tap operations and projects like the boring bar. You're doing things now that we mere mortals couldn't do if we were handed a 5 axis Kern, I can't imagine what would happen if you had a little machine like Adam Demuth's Mori tucked in the corner.

[@robc2536]

I've been doing this tool-making stuff a long time (since we worked Dunnington together) but I always learn something new from your videos. Thanks.

[@ROBRENZ]

Thanks for watching Rob!

[@joell439]

What a great detailed description of how A master works. Thanks Robin. 👍👍

[@ROBRENZ]

Glad it was helpful!

[@RRINTHESHOP]

Nice tip on the wheel dressing, love the nut idea. Thanks Robin for sharing.

[@ROBRENZ]

Thanks for watching Randy! ATB, Robin

[@michel4music]

Your high precision machining gives a lot of insight of factors comming in to play for slightly rougher jobs too, I assemble industrial machinery and your attention to detail really makes me think twice about what i'm doing. Thank you! To my fellow subscribers, donate to what you consume too, make it worth it !

[@hermit.shed.]

I know this video has been up awhile, but stefangtwr pointed me to it and I followed the steps to true up my shars diamond wheel. I even drilled and tapped the ring on a ProtoTrak. Worked great, thanks Robin.

[@ROBRENZ]

Thanks for sharing!

[@gregsmith2262]

The master of methodology. Thank you for the excellent tip.

[@JesseHersch]

You are a true craftsman. It's a real pleasure to see your work.

[@ROBRENZ]

Thank you!

[@thechipwelder1253]

I just recieved my first grinding wheel yesterday. This video pretty much answerd all questions I had last night about mounting it and dressing it. Timing could not have been better. Really like the tip about the metal strip you mounted on the dial indicator.

[@vallelungak]

This is really only for diamond or cbn wheels. A standard vitrified abrasive wheel would just be dressed with a diamond point.

[@thetrevor861]

Fascinating, your attention to detail and mindset. Thank you.

[@ROBRENZ]

Glad you enjoyed it!

[@sharkrivermachine]

Your timing is great. I picked up a moly stick a couple of weeks ago and have not used it yet. I feel more comfortable using it now. Thanks for sharing.

[@FredMiller]

Drop everything, I can mow later. Robrenz has new video! Great stuff!! Thanks! Fred

[@ROBRENZ]

Enjoy!

[@bcbloc02]

A buffer for the gauge is a really good idea. Being able to true up one of those wheels by adjusting rather than dressing seems like a huge timesaver.

[@ROBRENZ]

Thanks Brian! ATB, Robin

[@glennfelpel9785]

This video was like a really good movie I had to watch it three times to get everything. Wow, very well done. Thank you.

[@ROBRENZ]

Glad you enjoyed it!

[@OldIronMachineWorks]

Always learn something from your videos Robin, Thanks for taking the time to share. Gary

[@andyZ3500s]

I like your back up piece held in the collet. So much other great information. Thanks

[@bobvines00]

Robin, this "Toolroom Tip" is full of good information. I'm looking forward to your next video!

[@ROBRENZ]

Glad it was helpful!

[@casiwaszkiewicz5196]

Thanks Rob, glad to have spotted this one. Better late than never - always good to learn.

[@andrewphillip8432]

I once did a study looking at resin bonded diamond wheels under a powerful microscope, comparing those that had been ‘opened up’ using a soft dressing stick with wheels where this was skipped. I was just barely able to discern the ridges of resin directly behind each individual grain of abrasive, and valleys on all other sides of the grain where the soft abrasive dressing stick wore the resin away. I think if I had more time to experiment with dressing procedure I could have made it even more pronounced, but it was interesting nonetheless.

[@sealpiercing8476]

Microscopes are a great shop tool for seeing what you're doing, with abrasives especially. If you can just use your eyes, a lot of great techniques turn from spooky tricks to blindingly obvious.

[@piroman16tnt]

Man, Your IG videos are amazing, but Your YT videos are pure gold. I know if you're a machinist and also YT'uber you will screw up machining or making videos, but please, keep this videos on YT going.ATB Robin!For metric folks - 0.0005" is like a little bit over 10 microns

[@amundsen575]

I think you mean .00005"

[@piroman16tnt]

Obviously. Thanks and sorry for a typo.

[@captcarlos]

Thank you Robin, Amazingly timely, almost, but that actually helped me Focus ( you b) on the lesson! Just did a small run of precision stones and had to dress a new Norton 13mm wide diamond wheel. Went with what I knew and used a Norton carbide dressing stick to true and Alox stick to open. Like you're suggestion better How does the sticky cold rolled do in comparison to the Molly? And that hub, Hubba Hubba hubba. Had to do it, sorry. But, yep, that's brill. You could do the same on the vitrified wheels with that washer taking the grubbers. Lots of hubs, one for each .... Thanks again Robin, keep safe.

[@capncharlie7894]

Just another great video Robin. I have come back and watched this a couple times. Phil

[@matthewwest8689]

Educational as always, thanks for sharing the knowledge Robin!

[@SuperAWaC]

i always learn something from your videos. or at least re-learn something a different way. i doubt you could ever make too many of these.

[@jdwillink]

Amazing detail and exceptionally useful narrative as always. Thank you!

[@HanstheTraffer]

Thanks for sharing. Your videos are GOLD.

[@doughall1794]

Great timing, looking how to dress my wheel to make my precision ground stones this week. As always , great content.

[@stevevacopoulos2422]

Love your work Rob.

[@GoCreateHobbyMachineShop]

Fantastic tip! That I will definitely use. Thanks.

[@adamgalowitz1129]

Absolutely great tips. Thanks Robin.

[@vincentwhite7693]

Great information and presentation, thank you!

[@MegaCountach]

Brilliant Robin, love it!! Cheers, Doug

[@ant-x816]

Thats a very good way! Thanks for the tip!

[@druidnoibn7218]

Good work - thanks for the very helpful hints.

[@MCEngineeringInc]

Great information. Thank you for sharing.

[@LocoFabandMachineworks]

Outstanding as usual

[@st3althyone]

Excellent useful content as always Robin! Good to see you keeping busy even in these times!

[@James-fs4rn]

👍more superb robrenz engineering! Like the key way reference idea. Thanks for sharing!

[@bclare2544]

Excellent video Robin.

[@pierresgarage2687]

Another good reference video... Thanks for your time and care, Pierre

[@elyedwards5181]

Thank you for the video. I love these tips . This method looks a lot cleaner than my brake dresser that thing makes the biggest mess

[@AmateurRedneckWorkshop]

Great video and I learned something. Thanks for the video.

[@billchiasson2019]

Great video! And as always great content! Thanks for make this video!

[@kevinzucco8358]

Thank you for sharing your knowledge of dressing a super abrasive wheel.

[@dannymaciejewski]

Robin, awesome video! I have always wondered how diamond wheels are dressed true. I have been wanting to thank you, I am always challenged to consider WHY materials and objects interact and behave the way they do. I love your analytical thinking, it has made me a more professional tradesman! (Plumber) Thanks👍🏻😀👍🏻

[@davesalzer3220]

You are on a different level Robin.

[@lunkydog]

Thanks for this. Just what I've needed all along.

[@ROBRENZ]

Glad it was helpful!

[@rickrick1867]

Answer to questions I have had for years thanks

[@rallymax2]

New to surface grinding. Both of your tool room tips videos are great for me. Thanks.

[@ROBRENZ]

Great to hear!

[@jackjr473]

I just reviewed this video again to see why I didn't get the results I should have gotten. It was the washer behind the 6 screws and relief on the hub to get more room to move the wheel around to get better alignment on the diameter of the wheel. Thanks for explaining this process online.

[@swanvalleymachineshop]

Great idea. Cheers .

[@hodgepodgeenginerd1258]

You do awesome stuff.

[@simonsaelaertfurniture9883]

Thanks Robin, great content as always. Keep safe!

[@ROBRENZ]

Thanks, you too!

[@SolidRockMachineShopInc]

Nice job Robin! Steve

[@amundsen575]

at first I thought this was for axial runout. another super precision tip!

[@jeffanderson1653]

As always, well done.

[@christurley391]

Thanks for the video.

[@DudleyToolwright]

Interesting and informative as always. Thanks Robin.

[@ROBRENZ]

Glad it was helpful!

[@JBFromOZ]

very cool! so much awesome !!

[@Engineerd3d]

Always learn something from you. My surface grinder has been idle for a few months. Maybe it's time I get some practice in. Thank you Robin

[@forrestaddy9644]

Nice bag of tricks. I got comments, of course. I like the contact point protecter trick. Back in the day, I superglued a strip cut from feeler stock to the DTI. Reliable double side adhesive was unavailable. You young whippersnappers have it easy. I've used mild steel to dress diamond wheels many times. Never considered moly but moly barstock is scarce in these parts anyway. Dedicating wheel hubs to a particular wheel has been around for generations. However multiple hubs are expensive/tricky to make accurately for most shops. For that matter quick interchange of grinding spindle hubs is pretty much a concern for the tool room and sharpening lobby. Sopco is a revered name for grinding wheel hubs for those interested. They make hubs for most grinder spindles for a fair price (about $100 for a Cincinatti T&C grinder hub). They're worth the money and turn-around time is short for pupular hub configs in stock. Well, that was my experience 25 years ago. Good presentation Robin.

[@ROBRENZ]

Thanks Forrest!

[@charlieromeo7663]

Great video Robin. Always a good day when I see you have a new video out.

[@ROBRENZ]

Glad you enjoy it!

[@coreyb4073]

excelent video as always, ive had a diamond wheels sitting and waiting to be trued up, now i have a better idea on how to do it, thanks robin

[@gangleweed]

I just decided to keep my Macson surface grinder after 20 years lying stripped down and idle despite the fact it takes up some room and these tips are really gems especially the nut that holds the wheel.

[@lmsaltest]

Thanks for the great video Robin! You're always so informative and fun to watch, as you have good techniques and ideas. I'm setting up a shop in my garage to learn and to help teach my kids since they don't have shop classes anymore. I've been buying basketcase/dirty/ugly machines since that's what I can afford on my limited budget and the kids and I are cleaning them up and hoping we can refurb them to be useful, good machines. I got a Boyar-Schultz 612 surface grinder and just got it wired up. So much to learn and to explore!

[@ROBRENZ]

That is good to hear!

[@maxcnc777]

Good stuff Robin. That is exactly how I sweep in parts using a DTI... I try to explain it to my operators and of course, I get blank stares.

[@Threadexpress]

Thanks for sharing that Robin - Cheers Cliff

[@ROBRENZ]

Thanks for watching Cliff! ATB, Robin

[@jamesrandalls6914]

what a wealth of information, thanks, shooting star machine, candler nc

[@bugrobotics]

Faster than my way, that is certain. Thanks for the demonstration. I've been using my homebrew brake tool but will try the molybdenum sticks next time as the dust created by the brake device makes it a solid second place behind this method. I also haven't been dressing the resin back with as much frequency as you show here. Thanks once again!

[@akfarmboy49]

thank you really good tips.

[@RobB_VK6ES]

I made one of your DTI fine adjust heads and just love it. One change I made was to add a ball to the mag base arm. With a couple of side plates to make a stiff joint between head and arm there is sufficient freedom of movement to fold the DTI back along the arm protecting the stylus when not in use.

[@aticuss]

Awesome!

[@2129078]

Very informative Thanks

[@KD0CAC]

I go through withdrawals every time you post - love it ;) No longer have access to machining , started out in automotive , yrs. alter gunsmithing . Now electronics repair [ loved your Kelvin clips ] and gold recovery from electronics not repaired , so chemistry also , refining . Use to do underwater suction dredging gold mining in No. Cal. 70s-90s . You seem have varied interests also , machining & electrical , what else . Thanks again

[@ROBRENZ]

I remember you from the EEVblog forum!

[@user-gy4pm3zi8k]

Thank you so much Robin! I learned a lot of good tips and ideas from your videos.Although there will be some language barriers, they have been answered in the comments and thanks to everyone in the comments section.

[@johnmason6443]

Enjoyed that! Thanks very much,even though I am a wood worker,I love the way you describe precision metal workings.Have a nice day!👋👍🇩🇰

[@ROBRENZ]

Glad you enjoyed it

[@ericrichards5862]

Thanks for the tips Robin, I've been using the dialing in 50% on my jig grinder for some time but I still need to true up my diamond wheels and your technique will be helpful.

[@ROBRENZ]

Glad to help

[@CaskStrength777]

Excellent excellent vid, brilliant use of spring steel combined with indicator and pear tip to remove cosine error, with the extra detail of creating a rubbed flat that effectively creates a larger true contact patch. When you drilled the nut however, a more stable method to add more contact points with your vice would have been to add a v block against both jaws of the vice- creating 4 points of jaw contact rather than 2- and leaving less chance of deforming the nut from clamping, as well as less chance of slipping or rotating when drilling. Otherwise great vid as always! I need to get a grinder for home use, I only have a Harig 618 and a newer Okamoto at work to use.

[@mikemarriam]

Robin, did you leave the ring you put the six holes in annealed?

[@ROBRENZ]

yes

[@glennfelpel9785]

Robin Ordered...Thank you very much for the quick response.

[@ROBRENZ]

Enjoy