In spite of the almost complete domination of flexible molds for the production of wax patterns the various forms of rigid molds should be considered . The increasing use of patterns made by plastic injection and the desirability of producing thin items of known weight may lead to a revival of various types of nonflexible molds. Pressed soft metal dies are a relatively simple way of building such molds. This paper describes two types of such molds: a standard two part mold and another which accomodates more complex three-dimensional, undercut models.

Author: Albert M. Schaler