this should work! if it does, there should be an animated .gif included in this post.
this is a test I had starting working on. The final piece is to be a visor for a helmet,specifically a type called a sallet. I liked the way the profile came out but was unhappy with the contours on most of the other views. This was made from a piece of cold rolled 18 ga steel. I used a dishing form and a few stakes to get the shape, the eyeslot was rough cut with an angle grinder, then chiseled a but and then filed to get the round corners a bit neater. On the final, I will actually build the helmet top first then take a pattern off of that to ensure the visor fits well.