Hello folks,
I started to make gas checks with checkmaker from Pat Marlins.
I bought a piece of copper and aluminum sheet with thickness of 0.3mm(0.012") and 0.4mm(0.016") respectively.
It needs power to punch (cut) copper disk out of die. It was relatively easy to punch aluminum than copper even though aluminum is thicker than another.
Anyway, I have a problem with aluminum disk. When I form aluminum round disk into dish shape (complete gas check), it sticks on upper male die as attached picture.
This phenomenon makes efficiency down and takes much time to proceed. It didn't occur if with copper disk. What is wrong with aluminum?