My disc cutter does go to 1/8". It is from MSC Industrial Supply, and
the top is made of heavy plexiglass so that one can easily see how to
position the sheet of metal for punching. I recommend it to anyone
who is looking for a good disc cutter. I can see, however, why you do
not want to invest in another one right now. I can whack out a few
pieces for you to experiment with until you figure out if this is a
good direction for your work.
I tried cutting out a disc with my Miland’s punch. I have the smaller
one. It does not cut a true round disc, but rather a slight oval,
because the punch face is slanted at 45 degrees, and so it cuts
differently than a disc cutter. It made an attractive little piece,
though, which measured 1.42 x 1.49 mm or .054 x.059". I think the
sides of the dot were at an angle. If this much variation from round
would be okay for you, I’d recommend the larger punch, since there
would doubtless be many other uses for the tool in your workshop.
Let me know just what gauges, metals, and numbers you need for your
experiments, and we’ll get on it.