Rounding dies for 8" air tank

[Frank S]

After rolling the body for the air tanks I am making I needed to close the gap and round the ends just a bit
to do this I rolled a couple pieces of 1/4 x 2" flat bar in the sheet metal roller I made to the diameter the tank was supposed to be. then did the final shape to the dies with a torch

this allows me to get the finished shape completely round plus I can control the amount of gap I want for welding a lot easier and better than just using a chain clamp around the tanks