ah.....more hip joints for This Old Tony :D

That is amazing! Thank you for sharing -- I never would have thought of this creative way to make a ball

I also have Tom's book. It's full of good stuff. Thanks for sharing Stefan 👍

Nice video Stefan, I seen this years ago but completely forgot about it. I can not even begin to explain how much I enjoy your channel.

Thank you Stefan - oder soll Ich sagen - Danke schön Stefan for sharing this video showing your ability to solve a problem in addition to your excellent machining expertise!

Clever method. Well done.

You are an amazingly talented person and so very generous for sharing your knowledge. Thank you very much.

Cool ball-making technique! Thanks for sharing.

awesome discussion/demonstration/build....great review at the end...

Those close ups are so satisfying to watch ! Great video

Really great video Stefan. The company I worked for used to use this technique to make optical lens smoothing and polishing tools in cast iron and aluminium. Both convex (like your ball) and concave with radius from under 3mm up to several meters (almost flat). Although we rarely needed anything more than a hemisphere.

Stafan - Unglaublich hilfreich, um Ihren Denkprozess in Ihren Projekten zu sehen! Danke! ( English: Incredibly helpful to see your thought process on these projects! thanks! )

Clever machining Stefan, excellent vlog as per usual. Thanks for sharing.

i really like this idea of yours when it comes to machining a workpiece as a double ender. I have seen it a lot in your videos on grinding endmills, but never thought about doing the same with workpieces. Here´s hoping i remember this the next time i need it.

Always enjoy watching your videos. Thanks for sharing your thoughts and skills with us. George from Indiana US

About forty years ago an old machinist gave me a hint on how to do this. Last year I finally was able to use this method. I rebuilt a $4000 dollar three way ball valve. The ball was about three inches in diameter. I had similar results. Made it from 303 SS. A circle of any diameter can be inscribed any place on a sphere.

As always, very informative, entertaining, and clever! Thank you for putting in the extra time that it takes to make and edit the video! Thank you, Stefan! :)

Very cool technique demonstration and really well explained. Thank you!

Very, very good. Puts new idea's in me noggin.... Thanks Steve, great video!!!

Loved this. Never thought about doing it this way yet after watching it made me wonder why do it any other.

As I am older than many here, I do remember these and you made them correctly, as I remember (1960's) the crosshatching as being rather unique as you have done so.. and I am surprised that no one has brought this up. Your chef will be delighted as there is a high likelihood that this will be noticed.. You are a man of the trade consistently using time pr oven techniques.

Another very interesting video, thanks Stefan. I always enjoy seeing difficult work holding solutions.

Wow! that was great. I have never seen that technique for ball turning.

Stefan,you are brilliant,always enjoy your beautiful videos,please keep them coming.

Gday Stefan, I have never seen this done before, that works brilliantly, much quicker then using a ball turner on a lathe, thank you for showing another great technique, much appreciated, Matty

Awesome! The boring head actually can be used in the tool post on the lathe just like a ball Turner. But this looks much easier really.

I have heard of the technique before, but first time seeing it action. Thanks for the demonstration.

Hey Stefan I saw your post about these a little bit ago and I was so so hoping you would do a video on it, the finish on these is gorgeous, Ill bet your friend is the best looking chef at their place of business now. And I have to say.... who needs a ball turner when you get such an awesome finish like that on a mill. Learning things from you all the time, thanks so much for the knowledge :)

One of the most underrated videos this channel

Awesome! Thanks for sharing this technique.

Ades workshop has a good series of videos on making a ball turning tool post for the lathe, i did actually wonder how you would do it differently whenever it got to a bit where i thought "Stefan would put a shoulder on that..." It's very entertaining, well worth a watch, for the evolution of his ideas mid project if nothing else.

Thank you for explaining the actual tool path at @6:36. It made it look very simple technique.

See, this is what international collaboration gets us. Greetings from the US, stay safe out there!

Thank you Mr Stefan for one more awesome lesson!

Nice job.I made the ball turner for the lathe using a boring head but mounting it into a boring bar holder from the front of the lathe.Mounted a round button insert on the end of a short straight bar to fit the boring head.Sort of a few ideas joined together from some old Model Engineers magazine articles.Turns balls within .025mm circularity which is fine for rough work.

How cool is that. Something I have never even heard of before. Thanks for sharing.

A revelation Stefan, thank you. Mike

Great project. I even have that book...guess maybe I should read it. Thanks for sharing!

Great tutorial, great work on finished item.

I can't believe I never thought of this! Great idea

great lesson thank you

Thanks for the video, a neat way to make a ball!

Another great demonstration. Thanks.

What a great ball technique..never ran across this method before !

Very cool 🙂 thanks for sharing! For your friend's benefit, those fasteners are called Sam Browne studs, which might make them easier to find off-the-shelf in future!

Great content Stefan, thanks for sharing

Great video. Learned a lot. Thanks Stefan.

Nice one Stefan!

Very nicely presented great tuition thank you

Very satisfying and very simple.

Thank you for sharing this technique a very nice job well done

Some smart thinking there!! 😃

Very cool! Thanks for sharing!

such a joy to watch! thanks for sharing

That is a great idea for turning a sphere. Thank You.

Lovely that Stefan thankyou

The inverse of me milling spherical bowls with the tilted facemill. :-) Stunt milling is always interesting and fun to see.

Love your videos! Great stuff!

This was fantastic. Thank you for sharing. 👍

Very good information and was fun to watch.

Ooh, ooh, I've done this! I used my spin indexer to create a couple of finials in African Blackwood. After I created the spheres I indexed them 24 times & plunged the tool 0.2mm to create a lovely ornamental turning pineappley pattern.

That’s a really cool technique. Never would have thought of that use for a boring bar. Sort of an inverse boring bar.

Inspirational Stefan!!!

I can't wait to try this!

Clever! Cheers from Italy!

Always good stuff to be found on your channel. You' have a gift for distilling down all manner of intricate processes, even for us novice types. I'll have to go take a gander at Tom Lipton's book. Thanks for helping me part ways with my money.

Stefan, this was a very interesting and educational video. Now I'll have to order Tom's "Sink or Swim" book -- I've already got his "Doing it Better" book. ;) I always look forward to your videos because I enjoy and learn a lot from your thought processes & techniques as you perform (mostly) precision machining.

Stefan -- I couldn't figure out how you could cut the ball to the dead center , in my mind the shank would not allow that, I finally understood when I saw that the ball was rotating on an angle . Kick Ass video . You da man

New subscriber from This Old Tony enjoyed your video and looking forward to getting caught up with the rest of them.

Hello Stefan, thanks for sharing the interesting ball cutting technique and equation, cool video.

The math there was a bit off: the hypotenuse is touching the ball in the free end, but not on the shank end. You used the ball diameter on the long leg, but I think it should have been used on the hypotenuse. Not that it would've made any notable difference (you got 11.1363 for the angle using the diameter for the long leg, I got 11.5925 using it for the hypotenuse), just for the sake of precision which is something I love in your approach to everything.

Very awesome. Been waiting on this one. 👍

Great video. I really enjoyed this.

Superb work as always, thanks for the math explanation, I'm currently trying to relearn trig !

In the words of Sheldon Cooper (Big Bang Theory): "I'd like to do the math!" I missed Lipton's version of this - so, was glad for your presentation. You did a great job of demonstrating this ingeniously simple solution! That's 1 less tool I need for my lathe.

Great video! 5-6 minutes per part was much faster than I thought. :)

Very good video..thanks for your time

Man! I hope your friend the chef makes you a nice dinner I return! Those are 4-star buttons! And some stars for the workmanship and video, too.

thank you for sharing your beautiful knowledge Cheers

Carbide radius tool with the Dremel. Wonderful.

Very timely video for me, having recently had poor experience turning something similar (actually a toggle knob for a pressure switch) using a form tool on the lathe. I'll try it using my spin indexer on the mill tomorrow! My boring head screws onto the shank, so I'm guessing I'll need to grind a bar with the opposite geometry so I can run the mill forwards🤔 Also on my to do list is looking out for Tom Lipton's book👍

The Wohlhaupter, makes this approach golden. Sure you could get there with a standard BB holder, but 100 x more fiddling.

Loved it!!!

Stefan, Essen ist gut! Definitely take care of the chef. Your point about precision adequate for the job at hand applies to many things besides machining.

I'm always fascinated by your #1s that look like lambda. Λwesome video, Stefan.

Thanks for showing this. Took me right back to 1966 when I was an apprentice and this was one of the milling / turning tests.

Thanks for the video.

These videos are great

Eyeballs it to 15 micron. Gives it a look like, still not too bad. love your show stefan

If they used this in math class as a real world example, I probably would've paid attention! This is using a lot of basic trigonometric principles. GENIUS! Grüße aus Belgien...

Thanks mate 👍

Your friend must be soo happy, I would!

I did enjoy watching that! neat

awesome. I have been waiting for your next video

Nicely done! . Can I ask why you went for aluminium, not stainless or titanium? Aluminium usually rubs off black when not sealed. On a white chef’s vest.... Anodising also helps.

I am amazed that your work and ingenuity nice video

That was amazing, thanks.

I you trick of diamond die grinder bit I liked the boring head ball cut. I'm surprised you didn't anodize them. Thank you I learned something.

This is very cool!

Nice implementation of Tom's book.