Plastic moulding

Part of an airplane winch made by plastic moulding

Pulley made by plastic moulding

You don't have to be an expert to design parts for plastic moulding (injection molding). And although you don't want to consider plastic moulding for very short runs, plastic moulding can pay off in some cases in as little as a hundred pieces.

In designing parts for plastic moulding here are the few key things to remember:

• Keep wall thickness uniform.
• Avoid large solid areas that will not cool properly.
• Allow for 2 degree draft to allow your part to be extracted from the mold without difficulty.
• Avoid sharp inside and outside corners.
• Avoid very thin walls.