Mold Design for Injection Molding

Course Description

This course provides mold makers, design engineers, and molders with the common language and core knowledge required to successfully design robust injection molds that meet cycle time, cost, part quality, and lead time requirements.

Class topics address good manufacturing practices (GMP) for part design, including fundamental material characteristics, necessary processing techniques, and molding non-conformities, with a focus on robust mold design.

Since hands-on-learning is a core component of our training, we will utilize industry examples as a reference, and then dive directly into evaluating and improving your designs.
To couple factual basis, industry proven experience, and RJG’s scientific perspective together with hands on exercises and real world discussion was extremely valuable to me.

Chuck Hampston, Project Engineer at Extreme Tool and Engineering

Even as a well-seasoned Tooling and Process Engineer, I had many aha moments during the 3 day course. It was well worth the time, and should be mandatory training if you work with injection molds.

Mike Von Holtz, Tooling Engineer at Gentex Corporation

Course Highlights

Part Design

  • Wall Thickness
  • Draft
  • Radius
  • Undercuts
  • Surface Finish


  • Tolerance
  • Datum’s


  • Melt Flow Index (MFI)
  • Shrink Rate
  • Heat Deflection Temperature


  • Clamp Unit
  • Injection Unit


  • Melt Temperature
  • Flow Rate
  • Pressure Gradient
  • Cooling Rate and Time


  • Line of Draw
  • Steel
  • Coatings
  • Actions
  • Gating
  • Venting
  • Support Pillars
  • Cooling
  • Ejection
  • Instrumentation

Molding Non-Conformities

  • Warp
  • Short Shots
  • Sinks
  • Voids

Design for Manufacturability (DFM)

  • Simulation
  • Mold Design Checklist

Course Prerequisites