RTV Rubber Mold/Resin Casting shrinkage (was Re: 3D Printed ATSF Tank Cars)


Jack Mullen
 

Gene,

I'm coming from the same direction you are - thinking of producing parts primarily for my own use. My take-home on this is that it would be useful to pick some reference dimensions on the master and measure the same on each casting produced, keeping a table of the data. It would aid one's learning curve, if nothing else.

Jack Mullen

--- In STMFC@yahoogroups.com, "Gene" <bierglaeser@...> wrote:

Dennis,
Thanks for your input. Both you and Al W. mentioned changes in the size of the rubber mold over the course of its use. THAT is really a surprise. Your last sentence - "If you can't quantify it, you can't allow for it, so people build masters full size and live with the result." - may well sum up the situation in which I would find myself.

In this case and that of 3-D printing, why can't things be simple? VBG
Gene Green

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