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MOLD DESIGN GUIDELINES Illustrations and photos on designing tooling for economical, efficient implementation of EVTs (Elastomeric Vacuum Tools) Dashed line indicates edge of layup or part Allowances must be made for breather material, release film, vacuum and thermocouple connections, as well as the vacuum seal. Allow at least 5" beyond the edges of the layup for the sealing area. If the vacuum tool is to be hinged, allow an additional 2" along the hinge edge. In this example, the sealing area of the middle and right molds has been increased. The right mold has gone a step further and eliminated the top horizontal flange. OKAY At least 5" Arcs greater than 100° must _ have a radius > 1.00" PREFERRED Eliminate as many curves as possible. If 1 straight section causes the mold to be too large, break up the curve into 2 or 3 straight sections. If curves cannot be avoided, make them along one axis only, i.e. no compound curves. Every curve and angle built into the frame increases costs and limits the option of hinging the vacuum bagging tool to the mold. This mold has some complex geometery but working with the customer before construction began resulted in a fairly simple EVT. There were a few things that could have been changed, such as a little more elbow room for fittings and hardware, but overall the result was a success. PAGE 3 © 2004 TORR TECHNOLOGIES INCPDF Image | DESIGNING MOLDS AND FIXTURES Vacuum Bagging
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