Re: More workshop questions.

Nick Dvoracek writes:
> I have a couple questions. How do you drill a .3mm pinhole? I've
> always used .5mm pinholes drilled with a number 10 needle and that
> seems like a little big for such a small negative.

I use jeweller's drills, which come as small as 0.0135". My local
supplier is

  Otto Frei & Jules Borel Co
  760 Market St # 905
  San Francisco CA 94102
  (415) 421-8133
  http://www.ottofrei.com/

I seem to recall that they're less than $1 apiece, they work great in
dremel tools, and they last a lot longer than you'd expect unless you
let your students drill their own holes. 8-(

> Also, how do you cut a hole in the canister to install the pinhole.
> That plastic can be pretty tough and using a knife sounds dangerous.
> Would an electric drill with a quarter inch bit work?

I use something larger than a quarter inch drill bit in a regular drill.
5/16" maybe? Touch it up with some sandpaper.

I cut and drilled ~forty pieces of brass and bent little pieces up
at the ends (top and bottom of the canister) to keep the paper from
sliding around and in front of the pinhole. That's the biggest worry
with canister cameras. I use a hole punch to knock a small hole in
some gaffers tape, center the hole on the pinhole, then tape the brass
inside the canister. Electrical tape for the shutter.

I have about forty of these, and they're fairly well-behaved.

--Eric
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Received on Wed Aug 25 09:01:18 2004