From my expperiance you would have to use fine celled urathane rather than large celled styrene or a combanation of them to produce fine structure moulds. Styrene is very large celled and would make a light basic structure but the detail would be very coarse like anything made with styrene foam. Urathane has a much finer cell structure for fine detail but has very low resistance to impact requiring some form of moulded hard resin skin like used in fiberglass to provide the finish detail. So foam moulds would require several forms of material to provide both shape and detail.
JWE
Long Beach, CA
Apr 2, 2011 08:49:24 AM, gingery_machines@yahoogroups.com wrote:
Ron how do you maintain accuracy with lost foam? would seem you would have to cast a bit oversize and machine until your there? I guess CNC comes into play but then you have to start somewhere!
Wonk
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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