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PREFERRED Compound or conic surfaces that intersect the mold perimeter add significant cost to the construction of an EVT, especially if the angular intersections are severe. Transitioning these compound intersections into simpler surfaces along the edge of the mold can make frame and seal construction much simpler. Outer radii _> .50" Inner radii >_ .75" PREFERRED 5+" The mold on the left has a narrow sealing area and the sharp radii of the part extend to the edges of the mold. In the middle, the sealing area has been widened and the radii in the sealing area have been modified. On the right, a flat, planar sealing area has been created. If the part contour allows it, this is the most efficient design. PREFERRED Do not extend small joggles and curves from the part area into the sealing area. This creates added costs because the frame and seal must be manufactured to extremely close tolerances and be indexed precisely to work correctly. At right, the sealing area margin is wider and lies in the same plane, again significantly reducing the cost and increasing the reliability of a vacuum bagging tool. It also allows hinging of the tool. You could also raise the part area instead of recessing it as shown. DASHED LINE INDICATES PART LAYUP The mold on the left is the original design. At right is the new design resulting in simpler frame, diaphragm, and seal construction. Designing with a reusable system in mind also reduced the cost of the mold. PAGE 5 © 2004 TORR TECHNOLOGIES INCPDF Image | DESIGNING MOLDS AND FIXTURES Vacuum Bagging
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