![]() In order to create tooling and mold parts within 15 days or less, Protolabs mills all mold cavities on one of its machining centers using a ball or square-nose end mill. On external threads, bear in mind that the form may also be…well, incomplete. (7.6mm) in diameter, and recommends using the coarsest pitch possible (regardless of size) for your design. That’s why Protolabs recommends that internal threads should be no smaller than 0.3 in. But those made of plastic tend to strip more easily, especially on fine pitch threads or those the size of a pencil or smaller. This isn’t a problem when parts are made of strong, tough metal. The first is that the classic, 60-degree V-style thread seen in the fastener aisle of your local hardware store is relatively shallow. This has created a few challenges for plastic part designers. Let’s face it: Screw threads were originally designed for metal parts, and were standardized long before plastic injection molding became mainstream. Thread Size, Pitch Considerations in Molding
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