Woodworkers routinely cut thin soft meals by sandwiching them between
two sheets of thin plywood. Use double sided tape or glue to adhere the
assembly together. You can then saw with whatever power saw you have
on hand. A router with a straight sided carbide bit will clean the edges up
quite nicely. Use a solvent or heat to soften the adhesive and open the
sandwich.
Art

"Michael Koblic" wrote in message Another recent thread got me thinking:

In the near future I shall have to cut a doughnut like structure from
0.5-1.0 mm brass. The outside diameter 114 mm, the hole diameter 57 mm. The
cut has to be a) clean and b) reasonably accurate (within1 mm).