Re: [CAD_CAM_EDM_DRO] holes in thin shim stock?

Murray: When I have had to make "washers" of .002 to .025" stock, I stack 4
to 8 layers of it, cut out with shears, a bit larger than the desired
finished circle, onto some Baltic birch plywood (for you non-wood types, that
is all-birch, all same-thickness veneers, made in Finland and Russia), then
lay-over another piece of B birch ply, and NAIL at the corners, avoiding
piercing the metal. Then drill as if a thick piece of, say, aluminum. This
give fairly burr-free holes. Then, "clamp" that between centers in the
lathe, and TURN the O.D. If your hole is larger than, say, 3/8", you can
also install a BOLT, with some thick washers, and put the nut in the
lathe-chuck, and the head on a live-center (a socket-head bolt is wunnerful
for this!). Some "doin' it more than once" will do wonders for technique,
and you will get to doing it very nicely in "no time"!

Instead of wood, you might use 1/4" or 3/8" 6061-T6 Alum. plate, and
drill-tap for machine-screws in the corners. But to do this so those
jig-parts would be re-usable would take some planning!

Just one ol' fool's experience! Lotsa luck! Jan Rowland, Troll