Toolgrinding: Radius Groove Inserts

Visit my website for FAQ, a list of my machines, my products and some project documentations:
gtwr.de/
Consider supporting me on Patreon:
/ stefangtwr
I post very regular on Instagram:
/ stefan_gtwr
#practitioner_of_the_mechanical_arts

[@caseytailfly]

“We don’t need micron accuracy, a half micron will do fine” Thank you for staying on-brand Stefan 😂

[@timoruohomaki]

Just need to measure that of the high spot of the radius 😄

[@hashgeek929]

I love his sense of humor. Joking, but not _actually_ joking.

[@HansWeberHimself]

I’m touched. We never walked to the surface grinder together until today. I think our relationship is going to make large steps now. 😂

[@karlmckinnell2635]

❤ the added sound effects 😂

[@y2ksw1]

When I was working on finicky satellite mechanics, I was the dedicated tool maker for the workshop. Nobody else had the patience to work a day on a feature needed just a couple of times 😅 You are one of a kind, too!

[@StefanGotteswinter]

Beeing "that guy" in a shop is always great. I used to be the receiver of many nightmare projects to solve at my former dayjob due to that reputation :D

[@jamesallen3799]

Germany- Working on Sunday? You might receive a visit from the local authorities!! Well done, old boy, on the inserts.

[@StefanGotteswinter]

Rogue-German here.

[@anandarochisha]

​I am sure if Jesus had a nice shop like you that he would dive into the shop Sunday afternoon to make some chips..​@@StefanGotteswinter

[@billdoodson4232]

I remember doing a drydock as an Engineer on a ship in Bremen, when I was in the Merchant Navy, in the very late 70's early 80's. The shore crew started at 07:00 and called us lazy Brits, because we didn't start till 08:00. They then left the ship at about 15:30, didn't see us working till 21/22:00, or indeed on Saturday morning. When we finally got some time off on Saturday afternoon, Bremen was shut. Sunday was worse. I'm glad to see Stefan is not keeping the old ways going.

[@8__vv__8]

You can do whatever you like on a Sunday, as long as nobody can see, hear, or smell you

[@user-xh9pt8zu2l]

@@billdoodson4232 I believe it is still a logistic error to arrive in a German town on Christmas Eve unless you have your own family to go to. And I expect Stefan keeps this old custom as well.

[@MgBaggg]

Aaah, the soothing sounds of a surface grinder

[@terrycannon570]

I always enjoy your brilliant but simple super precise methods. Thanks for bringing us into your shop.

[@kkupsky6321]

Aw man. I was thinking of some awesome metal to put on. I’ll use your scraps you already have it in stock. Danke Stefan du bist der beste. Danke.

[@erikslagter3231]

Another happy customer! Great work Stefan!

[@billdoodson4232]

Hooray Stefan is back.

[@StefanGotteswinter]

I am always here :-)

[@chrismayer8990]

12:40 Schöne Aussicht! Ich hoffe, du hattest noch etwas von dem herrlichen Wetter! ;-) Beautiful view! I hope you still had some of that wonderful weather!

[@StefanGotteswinter]

Immer :-) War am Vortag am Eibsee wandern.

[@simonhopkins3867]

Wow. I just lost an hour on Google maps and images around Eibsee. ❤

[@rldoyle5705]

The filming of the grinding is great that you

[@heinrichhemker8123]

Thank you for allowing us to follow your work - its a wonderful way of learning!

[@Fyffewondahiphoppa]

Thanks for your wisdom Stefan.

[@ROBRENZ]

Nicely done Stefan! Thanks for the kind words. ATB Robin

[@frankward709]

Thanks for the video Frank very cool setup

[@adhawk5632]

It's a happy day when you wake up to a new GTWR vid, thanks again👍👌🇦🇺

[@RickRolling-tc7vb]

Favourite moments: Soundtrack when walking to the surface grinder was a highlight, thanks for that. Would make a good ringtone I think. Second was seeing the result from the customer's workshop on how the tool performed, really helped with the context. My initial thought was cutting o-ring grooves, but that didn't correlate with grinding the flank of the insert, so the customer images helped me to understand. Disappointed not to see the radius measurement that we were teased with in the thumbnail, but I'll get over it.

[@624Dudley]

Interesting setup, Stefan! I’m glad you uploaded this. Clearly, with a little imagination, you can do great things on a surface grinder. 👍

[@Rustinox]

Good one, Stefan. And if everyone is happy, life is beautiful. Even if you have to work on a sunday.

[@djizomdjinn]

And here I was just thinking I might need to cut internal radiused seats for a ball lock mechanism for a future project. Sometimes I swear you’re reading my mind. 😅

[@StuartsShed]

Excellent demonstration of precision work - thank you! Very interesting and detailed. 👍

[@erikisberg3886]

Thanks for Your general discussion about the usefulness of different grinders, very interesting. The BEMA seems very versatile with the tilting head. In practice I seem so far to use the D-bit grinder for most stuff second my old J&S 540 surface grinder. Always wanted a T&C grinder, but I should perhaps reconsider that. One of my best buys ever is Nikons smallest shadowgraph projector with digital scales, it gets used all the time despite having several microscopes in the shop. Very nice microscope btw.

[@flikflak24]

If your gonna make the magnetic base camera arm like Robin have then you could mount a thin sheet of metal that's highly magnetic on the ceiling so the camera don't need and floor space at all Just turn on magnet and slap it on the ceiling. Then adjust and som kind of mechanism with a string that you pull to turn the magnet off agen well holding the arm with the other hand

[@Dane33781]

I always learn something from you. Thanks

[@TrPrecisionMachining]

very good job stefan..thanks for your time

[@perw12345]

A measuring microscope and a quadra-check. Gearitis in full swing, I see. But when you're the man for the difficult job on a sunday afternoon, justifying toys like those becomes quite easy I presume. :)

[@StefanGotteswinter]

Thanks! Theres a fun story about the microscope.

[@joaolucasvieira2979]

​@@StefanGotteswinterSir are you really just gonna drop that on us for a quick flex? Jokes aside I would love to see a video on those fine pieces of metrology equipment!

[@bkoholliston]

Love that spin fixture but they are expensive. I really like the way you set it up to set the stick-out via gage blocks. I think I could maybe do that job on my D-bit grinder with your holding jig but with the slot for the cutter being 1mm offset to move the cutter relative to the center of rotation. I would need a double-end jig, one for left and one for right with that. Such nice work--thank you for sharing and sparking ideas!

[@StefanGotteswinter]

Boy are they expensive when not found on the used marked :-| I agree, this could be done very well on a d-bit grinder too!

[@StefanGotteswinter]

Machines come down to linear moving and spinning bits ;) What you make them do is just up to you and your imagination.

[@angelramos-2005]

Yes,another great video,Stefan.Thank you.

[@pirminkogleck4056]

Reminds me a little to my Scraper blade grinding helper thingy i copied from your older video ! the idea is genious !

[@StefanGotteswinter]

Very similar approach, yeah :)

[@pirminkogleck4056]

@@StefanGotteswinter Just so you know, when i copy your Ideas , i do it because they are so Genius or beneficial for my small hobbyshop, literally every drawer i open has some influences from you in it :)

[@PeregrineBF]

"If I had to choose and could only have one grinder in my shop, it would be a surface grinder." What if a Moore Linear Form Grinder actually came up for sale? They're a weird surface grinder with a pantograph-attached diamond dresser AND a (possibly simultaneous) crush wheel dresser. Obsolete thanks to CNC grinders, but very cool and more versatile than a regular surface grinder.

[@StefanGotteswinter]

Nope! I know about them from the moore book, but a Diaform wheel dresser would be a way more practical approach compared to crush forming. My old dayjob still had a bunch of them around and in use, mounted on Jung HF surface grinders - Despite having state of the art Jung CNC grinders.

[@holgerlauer]

A very good video, thank you very much! I saw your WhatsApp status before and and the pictures of the inserts in the forum. A measuring microscope and a quadra-check...are you kidding? I thought....hopefully it won't take long until the video will be posted... You saved my day 🙂

[@StefanGotteswinter]

LOL :D The Microscope is an accident. Its not supposed to be here, but I might be in love.

[@MarkW321]

Very clever well done.

[@notsonominal]

_Half a micron will do_ .. haha, well played sir!

[@martinchabot_FR]

I just purchased a "as new" old lipemec PM200, the little sister of your old lip 515. As it's new machining for me, I think I will check back all your grinder video...

[@StefanGotteswinter]

congratulations! the Pm200 are excellent machines!

[@Joelsfilmer]

I like the heresy trifecta of using a Canon lens on a Panasonic camera in a shop with a Nikon microscope.

[@StefanGotteswinter]

I like me some heresy :-)

[@paulbadger6336]

Well done 👍 thanks for sharing.

[@nigelpearson2976]

"Grinding accessory LEGO" 🙂

[@12345NoNamesLeft]

Damned clever Thanks for sharing.

[@youpattube1]

Excellent video. thanks.

[@pault4513]

Wouldnt the rotation of the hold down screws cause friction on the part causing it to move in and outward on the holding fixture Where as a plate with 2 hole push down on the part with out the friction on the part to be ground

[@denjah1169]

Haha, maaaan, amazing! Your nails is clear :D

[@carlhitchon1009]

The dut da dut da dut a dut got me.

[@jsteifel]

Stefan, what did you dress the diamond wheel with? It looked like wax possibly. It didn't look like something to clean it, since it left a white residue on the diamond. Thanks.

[@StefanGotteswinter]

Thats an aluminium oxide dressing stick (looks and feels like a bench stone, but has a very soft bond), it dresses back the resin binder and exposes the diamond on resin wheels. Its not ment to shape or true the wheel, that has to be done with a brake dresser or by grinding molybdenium or soft steel.

[@cvantrease1231]

I’d probably agree with the surface grinder being the most versatile option but having ran tool grinders for a living my favorite option was having 5 machines for each different setup😅

[@yak-machining]

Stefan you are my favourite alman

[@user-bg8bz4uf8s]

Happy customer and got paid, that's how it is supposed to work

[@marceloiannini8199]

How did I miss this BEMA surface grinder arrival at Stefan shop? Please tell me more of it!

[@taunusmechanics3121]

There is a video about it

[@StefanGotteswinter]

kinda - its squished into a shoptalk 😁😬 i have never done a individual video on it

[@Tezza120]

I noticed that you were using the back of the wheel on the second edge. I heard there's a risk of the edge chiping when the wheel spins that way because the carbide is not supported. Was this an issue or does it not happen?

[@StefanGotteswinter]

Thats totaly an issue and real - In an ideal case I would prefer the spindle to run in reverse then. But it is what it is, the ultra fine diamond wheel did well enough in this situation.

[@be007]

Hi Stefan, how do you make your own WD-40, you said it once in one of the last videos but I can't remember it anymore. Thanks for the answer. cheers ben.

[@StefanGotteswinter]

kerosene and a shot of way oil

[@be007]

@@StefanGotteswinter thanks for answering stefan. just about how many % is a shot ?

[@thefixerofbrokenstuff]

My boy ( 9 years old ) says "Stefan Gotteswinter would throw these Chinese gauge blocks at you" Yes, he actually said that. What are your thoughts on the 100 to 200 buck gauge block sets from red china? It seems to me that in my crude shop they are more than adequate and are good enough to use in a situation like setting up your surface grinder rig. Like you said, you have several sets. One is reserved for actual metrology work.

[@StefanGotteswinter]

The one that i used in this video is a Chinese set 😅 its very good and showed no surprises when I sneaked it into a calibration lab.

[@thefixerofbrokenstuff]

@@StefanGotteswinter good stuff. You are a big with the 9 year old boy and 5 year old girl demographic located in the Heart of the Ozarks.

[@kkupsky6321]

Stefan. Is this appropriate? Ich wünsche seiner Familie das Beste und hoffe, dass es ihm überhaupt nicht wehgetan hat. Ich hoffe, dass es ihm jetzt besser geht. Ich hoffe, dass es allen gut geht und dass es Ihnen gut geht und dass wir uns alle gut an ihn erinnern. Er war ein großartiger Mann, ein großartiger Schlagzeuger und ein noch besserer Freund. Es tut mir leid Chris… ??? I lost my friend and I dunno how to ask many more Germans if my condolences are ok. I only just heard. What does one say auf deutsch?

[@kkupsky6321]

Sucks. I don’t know how to say. Thank you.

[@kkupsky6321]

Danke. Vielen Danke.

[@EitriBrokkr]

It would be cool if they made a grinder, that was specifically designed for pins split in half, almost in the shape of a D. You could even call them a D bit grinder... 😁

[@samuelschuur7044]

why are the bolts on the front of the BEMA green?

[@StefanGotteswinter]

Oh those are ear plugs. Normaly in these holes there are two tapered pins to orient the head-tilt to zero. I put the ear plugs in when I pull the taper pins, to keep dust out.

[@cornnatron3030]

is there also a similar kind of setup to make it a concave cutter /radius cutter ?

[@StefanGotteswinter]

The same setup can create a concave radius :) Just a question of moving the point of rotation. Also requires a dish weel with some clearance to the back/side.

[@rtwolfrt]

I would love to know how much time you actually spent on this job... Thinking about the setup, finding everything for the setup, doing the setup, and actually machining. I'm not really interested in what you charged, but these inserts must be worth about $250 each at this point😅 Very nice work as always.

[@StefanGotteswinter]

maybe 1...1,5 hours shop time. Filming the whole thing drags it down a lot.

[@rtwolfrt]

@@StefanGotteswinter very efficient!

[@paulshermet535]

I'm not a machinist, but if you used a strap across the insert to hold it down, the screws wouldn't try to move it when tightening down. Watch all of your stuff.

[@pault4513]

We must have been thinking on the same wave length

[@paulshermet535]

@@pault4513 People who have the first name Paul, may be special. LOL.

[@StefanGotteswinter]

The screws moving the item to be held down is way less of a problem than one might expect :)

[@ktmturbo5836]

How does the insert holdup after you remove coating?

[@StefanGotteswinter]

Still very good - One insert did all 125 parts necessary and still looks fine. And despite the clearance surface beeing ground, the chipforming surface is still coated, so there is still a benefit over completely uncoated Carbide.

[@ktmturbo5836]

@@StefanGotteswinter ok Nice to know👍

[@alanbazzano4717]

does grinding the corner disrupt the chip breaker built into the insert? 1mm kinda seems like a bit? might not matter if it's a finisher only but just asking.

[@warrenjones744]

👍👍💪💪🔥🔥

[@Engineerd3d]

Is it a 25mm or 25.4mm?

[@StefanGotteswinter]

25

[@connorlynch4252]

I’m surprised that clamping with rotating screw heads doesn’t cause the part to shift as it’s tightened.

[@StefanGotteswinter]

That works usually quite ok

[@levitated-pit]

half a micron will be fine...... where i work half a mm will do!

[@ApukEldar]

👍👍

[@wktodd]

Stefan, do you have a manual for that measuring DRO? It is the same as the baty one I have without a manual.

[@StefanGotteswinter]

The Quadracheck2000? Yes, I have the full manual in german.

[@wktodd]

@@StefanGotteswinter any chance I could scrounge a copy? Or could you upload a few snaps of the non-obvious pages somewhere?

[@StefanGotteswinter]

@@wktodd I can scan it - But it will take a few days.

[@wktodd]

@@StefanGotteswinter Thanks Stegan, I'm in no hurry. I've just been looking online but all the hits for quadra check refer to the newer Heidenhain device.

[@1982MatMan]

Hi Stefan, as always another great video. I am always checking if you uploaded a new one, and i am happy when i see one. This is an offtopic question, but i never got an answer before. Did you ever finish that scale 1911 project? I was following it with great joy, but i never see that you finished the project.

[@mr.b2232]

👍😎

[@rionstretton8133]

Do Do Do Do Do 😂❤

[@iainburns4493]

0:10 when you hear “double ended” and you think oh no not that kinda German video 😬🥴🤣

[@StefanGotteswinter]

Sir, double ended connectors are a different topic.

[@iainburns4493]

@@StefanGotteswinter 🤣🤣🤣

[@a.bakker64]

13:55 kein Freilauf?

[@StefanGotteswinter]

Die Wendeplatte ist an der Spitze deutlich breiter als der Grundkörper, ein kurzer Abschnitt ohne Freischliff ist also kein Problem.

[@a.bakker64]

@@StefanGotteswinter Verstehe. Eingentlich meine ich Freilauf/Freischlif an der Vorderseite.

[@StefanGotteswinter]

@@a.bakker64 Ah! Der ergibt sich aus dem 5° Gekippten Spindelstock der Schleifmaschine.

[@mickymondo7463]

I agree with your thoughts on having a surface grinder for many jobs, I have a small unit that I have various shop made extras to allow me to utilise it for more than just surface grinding, currently adjusting a 1.5mm end mill to allow me to reach down .282" deep to complete a .750" long blind slot in some 4140. Without the surface grinder I would be waiting for a long series cutter to arrive, and the job would take longer than it needs to

[@user-oy4lk7fd9w]

so, i take it it's not something you can just free-hand grind...

[@StefanGotteswinter]

Oh absolutely. But my motivation to do 4 similar ones offhand is low.

[@yyams]

In the uk, germans have a reputation for lacking a sense of humour.... I've learned from your videos that's not at all true, it's just very subtle and deadpan. It's a little like how us brits feel in north america - nobody notices our the more subtle end of our humour, and if they do, often take it as insults.

[@alasdairhamilton1574]

Stefan, did you take his call halfway through your boulder climb 🧗‍♀️ ? 👍🏴󠁧󠁢󠁳󠁣󠁴󠁿

[@StefanGotteswinter]

between a hike and a boulder session 🤗

[@alasdairhamilton1574]

@@StefanGotteswinter bloody mobile phone, sometimes you just need to switch them off. 👍🏴󠁧󠁢󠁳󠁣󠁴󠁿