Grant Erwin wrote:
I have a need for some 4" circles of 1/8" steel. They have to be pretty
flat. They will wind up with a central hole of 5/8". (Tolerance here is
about 1/32", not really machinist tolerances.) If I could think of a
clever way to hold them by the 5/8" hole really solidly, I might be
tempted to try grinding up a trepanning bit - how hard can it be?

I suppose I could try cutting them with a circle template and a plasma
cutter, or I could make up a bandsaw circle jig and try cutting them on
the bandsaw (don't have a 24tpi blade though) or even borrow someone's
hole saw and try banging them out in one go on the mill. I don't have
access to a blanking press. I only need 3, so it isn't worth having them
laser cut.

I have a few days before I need them. What's the easiest way to cut these?

Grant Erwin
Kirkland, Washington


A jig saw with a good blade will do the job in a few minutes. True up
the edges with a grinder after cutting.

Gary Brady
Austin, TX