MIM

What Is MIM?
   Process Overview
When to Use MIM
   General Guidelines
   Technology Comparisons
   Materials Range
   Materials List
Design Guidelines
   Designing for Manufacturability
   Uniform Wall Thickness
   Thickness Transition
   Coring Holes
   Draft
   Ribs and Webs
   Fillets and Radii
   Threads
   Holes and Slots
   Undercuts
   Gating
   Parting Lines
   Decorative Features
   Sintering Support
Secondary Operations

Threads

Both internal and external threads can be formed by MIM; however, tapping internal threads is usually more precise and cost effective than using unscrewing cores. The optimum location for external threads is on a parting line of mold members to eliminate the need for unscrewing the mold members that form them. To hold a thread tolerance on a thread diameter, narrow flats—typically .005”—at the parting line are generally specified, as shown in Figure 7. This insures proper mold seal-off, reduces the likelihood of a parting-line vestige, and eliminates problems with flash in the root of the threads, thus reducing mold maintenance.