Re: [CAD_CAM_EDM_DRO] holes in thin shim stock?

Hi,

Excellent answer Jan, I'd just add that, for very thin shim - like the 0.1
or 0.2mm flat springs in watches, I usually sandwich the shimstock between
two sheets of brass and glue it all together with superglue. Using wood on
very thin stock can allow it to tear so metal is better. The superglue can
be released either by a bit of heat or, if I don't want to risk drawing the
temper, by soaking for a few hours in acetone.

Ian
--
Ian W. Wright
Sheffield UK
www.iw63.freeserve.co.uk

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: 10 January 2002 06:19
Subject: 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
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>