Today I made the smoke box cover for the vertical boiler.
I decided to try a different method for making the 20 degree conical shape. Previously I have beaten or tapped or hammered the shape. This time I decided to press the annealed 3mm thick copper into the desired shape. It worked!
I needed a 20 degree conical shape. For various reasons I decided to use 3mm thick copper.
So firstly I turned a male and female form in hardwood.
Then I cut out a circle of 3mm thick copper plate.
Then I pressed the shape between the forms in my 20 tonne hydraulic press.
It worked perfectly! In one go. But the flange still needed beating with a hammer, after multiple annealings.