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Tooling to meet your specific application.  Whether it be a short run project requiring aluminum tooling or a hardened steel mold capable of producing millions of parts, the answer. What size mold do you need?  What type of plastic will you be using?  How large will the machine need to be to run the parts?  What is the production volume needed from the mold?  These are just a few questions that need to be answered when designing precision tooling.  We will help you answer these questions and design a mold that is just right for you.

Plastic Injection Molding Design Guidelines

  • Use an approximately uniform wall thickness throughout your design.
  • Keep walls thin - typically between 1/32" and 1/10". This allows for proper cooling and reduces cost by minimizing use of material. Thin walls also reduce problems with material shrinkage. Although some unevenness will occur due to shrinkage, walls as thick as 1/5" can be used. Keep wall thickness at least wall length / 50. Keep 90 deg walls under 0.25" high. Keep thickness of ejection pin surface wall at least .07".
  • To strengthen parts, instead of using thicker walls, use additional structures such as ribs. When using a rib, make the rib about half the main wall thickness. Use fillets at the base of ribs.
  • When using a rib make it about half the main wall thickness. 
  • Round corners and edges wherever possible.
  • For easy release of the part from the mold, add a slight taper to the sides (typically ~ 2 deg) - especially for textured walls and walls higher than 0.25".
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