CATIA V5 : Design a plastic attachment feature : Screw Boss

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This Video shows how to create a 3D parametric model of plastic screw boss in CATIA V5 and build model such way that you can modify the geometry quickly at any stage of the design by considering design guidelines .

The design and placement of bosses is critical in injection moulding. As with all injection moulding, shrinkage is a major consideration. Shrinkage looks bad, and more importantly if shrinkage affects your bosses then they might not align properly causing delays in assembly.

The important things to look out for are:
– The thickness of the boss should be 50% or less of the parts nominal wall thickness.
– Bosses need to be tied in place with ribs and fillets, to prevent warping.
– The Internal diameter of screw bosses should be slightly less than the screw thread and their length should provide at least 60% of the screw thread with something to catch on.