RE: [CAD_CAM_EDM_DRO] Stupid Response WAS Re: Casting clearance

>-----Original Message-----
>From: wcgutman@[216.101.6.86] [mailto:wcgutman@[216.101.6.86]]On Behalf Of

Wayde C Gutman

>...Would not the wax at the bottom of
>the acme thread create a radiused bottom between the two walls,
>especially when the rod is dipped, therefore cancelling out the goal of
>having the lowest possible clearance between the rod and the epoxy ?

The spray-on silicone release agent will also form a radius. The whole
problem revolves around the meaning of "lowest possible" clearance.
How thick a layer of wax you get depends on the temperature of the rod. If
it is cold and you dip it in just-hot-enough-to-melt wax you will get a
thick layer (thicker by the second!). If the rod itself is above the wax's
melting point, you will get a thin even coat, whose thickness is determined
by surface tension... but you have to remember to rotate the rod until the
wax hardens, otherwise you will get a thick area from the drip.

By pigmenting the wax (or whatever coating you use) you might be able to
judge the thickness you have applied. Make up a sample chip using accurate
flat stock and a micrometer to use for comparison.
-Kevin Martin