15 years ago
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.
While the tubing may be hard to obtain in small lots, pneumatic/hydraulic cylinders could be disassembled. See
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).