Talking about turning and boring hardened steel with CBN, making your own custom CBN tools and small diameter lapping. Web: gtwr.de/ Instagram: / stefan_gtwr #practitioner_of_the_mechanical_arts
@@StefanGotteswinter there is nothing stupid about your video's Stefan. You have a great talent editing your video's. You always get all the important information in there without any filler. I can't even thank you enough for the skills that you have tought me. Plus it is just enjoyable to watch your videos you have such a great personality. Andy
I hate short videos, just when things get interesting they end, not to be cheeky Stefan but ii always listen to your pronunciation of "wise" instead of "vise" and i am noticing your getting better
You can say that over and over about Stefan's videos. I mean, whenever I try to have a quick glimpse at them, I always end up watching them a-z, if not even re-watch, in some parts just to make sure I've got it. His vids are as bemusing as their contents are.
I clicked on this channel by mistake I started watching waiting for the show to start to see what I clicked on but this started and I was hooked right from go so I watched all the way through and I am so glad I did it’s amazing how a simple wrong touch of a finger can result in such an awesome outcome thanks for the video I can’t wait to see some more of your channel
Not a machinist (lowly wood world) but gosh its mind blowing the tool cuts with the edge break. I would have thought that would have blunted the tool instantly. That was super cool. I too am a fan of the long format (though I shouldnt spend so much time on youtube). Really cool video all around. So much learning even from a wood perspective.
Mark ... google "negative rake cutting" for a complete explanation... the tool does not actually cut on the "edge" but inland... completely unintuitive !!! 😎👍☘️
Excellent video Stefan. I plan to put that CBN repurposing to use. for the kind of work job shops do it seems like a must know. Especially with the cost of new . Thanks and thumbs up
Right up my alley. I built an automated, multi stage, hydraulic swaging press this year that used belleville washers as force gauge/regulators on each station. I thought I was so clever but I guess there is nothing new under the sun. They pack a lot of force into a very small space. The CBN information is really useful, thanks.
Stephen Incredible video is just when you think you were done with purchasing more equipment Here Comes one of your videos and I throw everything out the window also that comment on Continental Drift was hilarious great video great information thank you
Hi Stefan, Great video. The the idea of running CNB at high speeds is to cause enough heat before the tip to anneal the surface a little. We run at 500 sfm most of the time but we run the feed rate slower than recommended to achieve a better finish. We have had great success using CBN and love it. Steve
Interesting how you narrow down the possibilities to get the fit you want. Maintaining control all the time.Next time I do anything' I'll reflect back to this lesson
Love your videos... One small comment - you have a 23sec lag at around 13:07. One request too: Would you PLEASE (with lot's of way oil...) consider making a video(s) on your point of view of (comparing) different lathes and/or mills for the home machinist that wants good to high accuracy vs. budget?
Thats tough, because I dont know a lot of machines. I ran a bunch of industrial machines, some hobby machines and thats it. And doing a video where I walkt trough a catalogue with photos of machines is tricky because of copyright laws.
@@StefanGotteswinter Thank you for the kind reply!!! Well... I didn't expect a catalog detailed review - I'd be more than happy if you share your thoughts of good quality brands and/or manufacturers, from your experience.
I loved the hell out of this video. I discovered CBN and Cermet inserts recently and am getting somewhat obsessed with them. This just pushed me over the edge. I accidentally trashed a CCMT CBN insert and am about to order some diamond wheels now that I know I can touch them up and get more use. Awesome vid Gottes!!
Its for sure third to a lot. I just happen to stick everything in front of a camera. Thousands of quiet, high skilled machinists, toolmakers, moldmakers, etc out there doing higher class, more precise work than I do.
Stefan Gotteswinter those folks would be on a level of machining that I’m not even sure I could enjoy. I suppose due to your modesty, us 200lbs gorilla hobby machinists, can still enjoy. And also build a few of your projects. I built your parallel comparator/surface gauge you made a while ago. Turned out very well, except for the ball bearing feet. I could not get them loc-tited in and grind them without heating them up.
I’m struggling to imagine a higher degree of precision than yours and why that would be needed. OK, so the 1 micron diamond paste was too fine and you switched to 3.5 micron paste to speed things up, but geeze! (BTW, looking forward to seeing what those bushings and rollers are for given the care and precision. I know you said you can’t reveal the product but I’m guessing this is not a tubing bender!)
Another fascinating video! Thanks Stefan. I took note of your tip in an earlier video of sharpening carbide inserts using a diamond hone - I'd given up trying to use them on my small lathe, but now they cut like a dream! Cheers :)
Very informative as usual! Another great source for carbide is in carbide circular saw blades. I was lucky and found a box of new various Sandvik Coromant CBN inserts at a local flea market of all places 👍
There is always that one guy at a fleamarked. Selling a rusty wrench, his grandmothers old potts, an original copy of the necronomicon and a brand new box of inserts ;)
Excellent video and great information! Thank you for keeping your videos about machining and not restorations, travel and general BS like so many others have gone to.
Thank you for a great video, Stefan, your channel, in my opinion, is definitely the number One machinist and tool making channel on RU-vid Thanks for all that you do.
Good stuff as always Stefan. People on You Tube seldom talk about a cutting edge chamfer on tools. They usually talk about getting them honed sharp. I chamfer regular brazed C-6 Carbide tool bits to rough out welded bores that always have interruptions doing construction equipment repair using my portable boring bar. It helps to keep them from shattering. The construction of your CBN tools was very interesting. Cheers
Thanks for the video Stefan, very interesting content! Can't wait for your promised video about drilling tiny holes, really excited to learn something new!
Thanks, Stefan! Saw the 50 minute video and new I was about to learn me stuff😁. I like your method for doing specific chamfers. Definitely a great plan for a mass production like job. I haven't even turned anything with carbide yet and you drop the cbn bomb! 🤣 Thanks for the video, it was very educational and elegant 😁.
I love the long format and at 26:00 I have no idea how you resisted the urge to put your finger over one end and pull the pin to make the ever so satisfying 'POP' as the pin comes out! I have convinced myself that while you didn't do it on camera, you did do it nevertheless! :) A+ content!
C-B-N,C-B-N! Thank you Stefan, really appreciate you sharing your tricks on the dark art of cbn tooling. Even just sharing the angles you grind to saves the rest of us many, many hours of trial and error. I can stop holding my breath for this video now. Cheers Jaime Moneyvsmachines
So if you have the good fortune (?) of having a workshop on a fault line, you can attach your lathe bed to one tectonic plate, your carriage to the other plate, and hey! free carriage feed! ...with the occasional, unpredictable roughing operation!
If you take the median of 0.018-0.180 μm/min, you get 0.090 μm/min, which is 47 mm/yr (4.7 cm/yr). With your range, of 0.018-0.180 μm/min, it's 9.5 mm/yr to 94.5 mm/yr.
Awesome video. Thanks for Sharing your knowledge, Stefan. I always pick up techniques and methods to incorporate into my watchmaking workshop. Cheers, Reuben
Those tooling marks on the bored parts look quite deep. Is that an illusion because the material is so reflective? Are the marks actually just a couple of microns? I'm ecstatic if I can get within a thou! I think this is one of your best videos ever. So much knowledge packed in. This is a subject that most of us hobby guys have no families with.
Great video! Been watching the last three years of your episodes and great quality, good teacher. Thanks for sharing the knowledge. btw your German has only improved. Thank you Stefan.
"... at least that's what the guy from the nitriding place told me" 🤣 Great video as always buddy! I'll be doing some more lapping in an upcoming video, I might need you to cast some more disapproval 🙂
Stefan Gotteswinter for the mechanical Arts, Rick Beato for the musical Arts and Peter Stanton from Edge Precision for the CNC-Arts are Guys at the top of their Game. It is a REAL Pleasure to watch those Masters of their crafts and learn tons from them....looove it.
Realy interesting with lots of info about hard turning, thanks a lot, beware of cosine error when messuring with a test indicator ( I use the cosine error to my advantage when using my Interapid in inch when messuring in metric )Are the disk springs made to order and from whom, I know of another youtuber PeterBjork ( he is as meticulous as you !! :-) ) that need a large one for a Lambo clutch.
These are mild steel --- actually better than brass for lapping hard steel OR carbide . Also try Borzon. MUCH better for hard steel 😎 (Some kind of c b n like abrasive)
Nice video Stefan ! I like the real life approach. There is this Pakistanian guy in Frankfurt flea market who sells all sorts of inserts. I have bought a few boxes of unused CBN inserts with a VERY decent prise. He calls those "Diamond" :) I think he is still there every saturday and if You are lucky enough to live near Frankfurt ...
Nice informative video great work as always, did you know you can get vitrified diamond wheels made specifically for grinding pcd and cbn and they work awesomely .p.s running cbn at high surface speeds anneals the chips
haven't watched till the end, but the talk about ceramic lapping discs got me thinking - turn an aluminum blank, load it up with diamond slurry/paste, anodize it (perhaps hard anodize), hope that the diamonds don't fall off while the anodizing is forming - and one just might end up with a usable ceramic/diamond lapping wheel, normal room temperature anodizing I do every day at my shop, but hard anodizing would be trickier and time consuming to set up, but I've done it before, just need to find time for a project like this, that is the biggest problem...
This has to be one of my favorite videos of yours.....I think I've watched it 10 times.....for the brass lap did you drill and tap for the set screw a little undersized to get it to expand or does it just expand a little naturally. And do you have any recommendations on where to find a small torch like that?
Hello Stefan, I am a new subsriber and live in South Africa and the knowledge that you impart via the RU-vid videos is astounding. I would please like to know the sizes and description of the Surgical needles that you use to dispense loctite as I saw in a video recently. Regards, Louis
Stefan, regarding CBN dust particles when grinding, have you considered what might be passed through the vacuum exhaust? My shop vac’s have pretty coarse filters to provide good flow. Just a (cough) thought. Thanks for the recycling tips to keep the costs of tooling down!
Very interesting, never saw CBN before! Independently of that, for quite some time, I wanted to ask what kind of paper towels (the light blue ones) you use? They look very strong and durable. Could you please give a few hints which type you recommend, and also which properties you look for. Thanks!
You said you were able to sneak up on the inner diameter with that boring bar - how did you do that while having the tool take a substantial enough bite? Was it possible due to the sharpness of the tool? I have to sneak up on a precision ID as well and was eyeing an inside threading boring bar I have lying around... Has a rather sharp point.
"I find that most of the time off-hand [freehand] grinding is good enough"....Trust me, it entirely depends on who's hands we're talking about!! Yours are clearly well calibrated.
I used them previusly on my dayjob for small brass and aluminium parts, to get an insane good finish. They worked well, but where expensive. Thats all my knowledge about them ;)