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Change direction before corner For this particular part shape, it might be better to extend mold in same plane as part edge OKAY PREFERRED Eliminate compound curves in the sealing area. Construct the mold so that the sealing area changes direction along 1 axis only, not 2 or 3. Compound curves will increase frame, seal, and diaphragm costs. If you need to follow the part contour more closely, change mold edge direction after or before the curve by at least 3", not in the middle as shown in the left hand mold. OKAY PREFERRED For relatively small molds, or molds used to make channel shapes, truncate ribs or "hat-sections" and provide a flat sealing area whenever possible. The only other option would be to place the entire mold onto a larger baseplate for bagging. In this example, the upstanding portion of the mold has been truncated and tapered down to a flat sealing area. This minor design change will cut the cost of a reusable bagging system by at least 40% and allow the vacuum bagging tool to be hinged to the mold. On the left is a mold with a typical spar or channel shape. With the channel shape extending to each end of the mold, constructing a frame and seal was more involved than if the channel shape were tapered down to the same plane as the sides per the mold shown at right. The draft or angled sides of the mold on the left helped with adapting a frame and seal to fit. PAGE 4 © 2004 TORR TECHNOLOGIES INCPDF Image | DESIGNING MOLDS AND FIXTURES Vacuum Bagging
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