In article , DoN. Nichols says...

Of course, the same could be said for any size drill bit, but it
gets rather insane to pilot drill for a 0.100" diameter drill bit. :-)

Not at all DoN - I do this all the time when making small printed
circuit shield enclosures. I want the connectors to wind up in
the right spot, within a few thousanths - so I lay out with
dial calipers used as a scratch gage, under a microscope, and
then centerpunch with a scribe.

For the larger holes I centerdrill with a carbide 3/64 drill
to keep the larger (0.10 inch or so) holes from wandering.
This sort of layout technique will get everthing in within
about five thou and is a lot faster for prototyping than
trying to drag everthing down to a milling machine and sticking
it down with double-stick tape.

Jim


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