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This is my first post here and hopefully can be helpful.

Being a machinist, I recently made a set of punches for cutting holes and round cutouts. I used schedule 40 stainless pipe, the cutting edge turned on a lathe. Being that pipe comes in sizes from 1/8" up to just about any size, you can get quite a selection of sizes. Also, sch. 40 is thick enough that the sizes can be tweaked a little on the lathe.

It's a simple operation on a lathe so it shouldn't take much to get a small machine shop to crank a few out. I used stainless pipe scraps which I got for free but I suppose carbon steel pipe would work as well. Since pipe isn't exactly round have to take a light clean up cut on the i.d. and o.d.

I haven't done it yet but I think with maybe a little grinder and file work some nice round design stamps can be made also. After the edge is cut the pipe can be sectioned to make half rounds or other radiuses for ends and such.

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