Re: Precision taper/polishing job

On Tue, 10 Apr 2007 12:12:27 -0400, "Lloyd E. Sponenburgh"
<lloydsp@xxxxxxxxxxxxxx> wrote:
<snip>
This is the recommended angle in the pharma industry. We use pill presses,
and all of our cavities (dies) are made to that divergence angle. Straight
dies wear out much, much too fast with abrasive compositions.
<snip>
Excessive wear is relative to your production requirements and
cost of the tools.

The suggestion of another poster to use precision tubing for the
mold form seems to have merit.

A quick web search indicates stainless steel tubes are available,
but small quantities may be a problem.

See
http://www.sandvik.com/sandvik/0140/Internet/se01595.nsf/GenerateFrameset1?readForm&url=http://www.sandvik.com/sandvik/0140/Internet/se01595.nsf/(DocumentsInternetWeb)/A3EEB94DA5D1A68DC1256B680035B18F

http://www.mertl.com/anonymous/info2.pdf

http://www.mertl.com/anonymous/info6.pdf

While the tubing may be hard to obtain in small lots,
pneumatic/hydraulic cylinders could be disassembled.
See
http://www.cylindersonly.com/ncmseststboc.html

As an alternative, depending on the pressure/force used, it may
be possible to use pvc pipe. The bores are generally very slick,
and it is intrinsically corrosion resistant. Also, it won't
produce sparks. This could be cut to suitable lengths, and
movable plugs placed in one end, and a close fitting ram used to
compress the form. The plugs and rams could also be nylon or
pvc. The compressed form could the be extracted from the tube by
either removing the support for the plug and pushing on through
the tube, or in a second op, inverting the tube and pushing on
the plug.
One source for PVC tube/pipe is your local ace hardware.
Enco has pvc/delrin/nylon rod for the plug and ram.


Unka' George [George McDuffee]
------------------------------
Watch out w'en you'er gittin all you want.
Fattenin' hogs ain't in luck.

Joel Chandler Harris (1848-1908), U.S. journalist.
Uncle Remus: His Songs and His Sayings,
"Plantation Proverbs" (1880).
.

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