There are several ways, depending on the availability of machine tools. Someone
else has described a method using hand tools. If you have access to a drill
dress, you can use an adjustable circle cutter set to cut the correct size hole.
Clamp the cap carefully to the table, be sure it is centered, adjust the drive
belts to the pulley set giving the slowest speed, and feed slowly. If you
haven't used an adjustable circle cutter before, practice on some scrap
material. They tend to grab, so the secret is a light touch on the feed lever.
When the hole is finished, smooth the burrs with fine sandpaper, working
tangentially so the scratches won't propagate as a crack.
Good luck,
Gary Edwards.
Tom Trottier wrote:
> To summarise the best advice: make a lensboard out of an OM body cap
> using a retaining ring. Any advice on making the 39mm hole?
>
> Tom
>
> --- Original Message ---
> From: "Keith (R.K.) Berry" <keith_r.k.berry@xxxxxxxxxx>
> Date sent: Thu, 22 Jul 1999 16:04:48 +0100
> ...
> > Alternatively, the 39mm thread being smaller than the Oly mount, perhaps a
> > body cap can be drilled and tapped so that the cap can fit straight into an
> > Oly lens mount on a bellows.
> ...
> ------------------
> From:Tom Trottier, ACT Productions Inc.
> __o tom@xxxxxx http://www.act.ca
> _ \< +1 613 594-4829 fax +1 613 594-8944
> (*)/'(*) 199 Holmwood Ave, Ottawa, Ontario Canada K1S 2P3
> "Make it as simple as possible, but no simpler" - Einstein
>
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