Rounding dies for 8" air tank

[Rocky71]

Outstanding! Thank you, Frank, exactly the details I was looking for. Glad to hear the SFC made out ok too- hope you all made it bad to the world none the worse for wear & Thank You very much!!

[Frank S]

Outstanding! Thank you, Frank, exactly the details I was looking for. Glad to hear the SFC made out ok too- hope you all made it bad to the world none the worse for wear & Thank You very much!!

Rocky; I would suggest that you or anyone else interested in the art of spinning or even thinking about trying it to first look to a source of reading materials 2nd since we live in an info overload world of videos to watch a few and take notes of how one guy does it and compare with how another does it a little differently. then start out with a small disk of the metal of their choice each type of metal has its unique properties when spinning.
I am by no stretch of the imagination any kind of expert on the subject so never consider my word as the final gospel of how to do it. I have spun a few different types of metal. IE Aluminum ( must be annealed) copper ( needs to have periodic heating while spinning to prevent work hardening) Brass (only certain grades lend to spinning very well.) Even some sintered or pressed metals can be spun but usually requires free form while using a duel contact roller tipped spinning bar and very careful moving of the metal to prevent it exploding, cold rolled mild steel one of the most common metals in the world for roll forming will wobble uncontrollably at the edge if try to move it too far too fast without working the full diameter, this is also true for several of the other metals. Hot rolled mild steel spins like cold rolled but until the surface mill scale is worked off you will be bathed in dust Wear a respirator. Don't even try cast iron or any other porous metal the very select few sintered metals previously mentioned excepted, and even those can only be spun shaped ever so slightly. Some grades of stainless steel are nearly impossible to spin even annealing won't help. as with exotic alloys.
A good rule of thumb is if it can be press formed cold or without having to be heated to near its melting point it can be spun, with care and practice.