I started a couple cauldrons/cooking pots, the smaller one ended up a nice enough shape, just need to put a handle on it.
The larger one didn't go so well, it went sorta Pringle shaped, and I had a hard time getting it to even out. After that I worked it to thin and split the bottom, oops. I also had a hard time bringing the edges in to get a more closed shape.
I was using a ball peen and a piece of heavy wall pipe with the edge rounded over, about 2.5" or 3" diameter, to sink them.
I started in the center and slowly spiraled my way out, making a little ridge and pushing that ridge to the outside edge. I was working cold, and relaxing the metal with a torch in between passes. The smaller one was also a little thinner, about 1/16", and the bigger one was maybe 11ga.
The smaller one went a lot smoother, no Pringle shape, didn't feel like I had to go over the same areas as much.
Would a larger tool help with making larger dished shapes?
How do you prevent your work from getting that Pringle shape, and if you do get it, how do you get rid of it? Working around the edge seemed to help, but trying to stretch areas within the workpiece didn't seem to do much for me.
The next attempt on the larger size I will be doing hot instead of cold, it was rainy today and I didn't feel like catching any 120v from my blower controller again so I tried getting a way with doing it cold.
Any other advice for more drastic dishing? I wanted to get the rim to be a smaller diameter than the belly on the larger one, but didn't get a chance before I split it.