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  #11  
Old 08-12-2020, 05:11 AM
vn800b vn800b is offline
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Default thanks guys, metal finishing

Thanks guys for all the help and posts, I got the metal finishing done, to the best i could do it, and learnt alot on the way. looking forward to the next project!!

Thanks Michael
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  #12  
Old 08-12-2020, 05:03 PM
Joe Swamp Joe Swamp is offline
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Quote:
Originally Posted by Kerry Pinkerton View Post
I still have the bowl I wheeled and used it in my Metalshaping 101 seminar. I did not quite get to a full hemisphere because the center got really thin. I can press a dent in the middle with my thumb. If I kept going, I suspect the metal would fail in the center. If I had wheeled more closer to the boundary than the center, I would have raised the shape more and utilized the total quanity of the metal better.
I've been wondering about this for a while and last night I think I finally figured out the math for how much the metal thins at the top if you wheel a disk into a perfect hemisphere, without shrinking the edges.

If my calculation is right (which I think it is), the metal is 1/4 as thick.

This is the mathematical ideal though, probably easy to overdo it in the real world.
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