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The Force, Pressure, & Area unit of RJG's Math for Molders guides students to use a formula triangle to calculate these critical factors of injection molding processes. The resulting figures can help molders understand their machines' capabilities, matching the right molds with the right machines while avoiding part defects and mold or machine damage. The lessons feature practical examples related to plastic injection molding, opportunities for practice, and an assessment. Suggested prerequisite: Math for Molders: Area (Unit 1) Read more

The Percent Change and Variation unit of RJG's Math for Molders course teaches the formulas used to calculate percent change and percent variation, which can be used when building, optimizing, or troubleshooting an injection molding process. The lessons feature practical examples related to plastic injection molding, opportunities for practice, and an assessment. Suggested Prerequisite Math for Molders: Averages (Unit 6) Read more

The Percent Usage unit of RJG's Math for Molders course focuses on calculating percent usage using a formula that is frequently used in the injection molding industry to help ensure that mold requirements do not exceed the capability of the machine. The lessons feature practical examples related to plastic injection molding, opportunities for practice, and an assessment. Suggested prerequisite: Math for Molders: Volume (Unit 2) Read more

The Ratios unit of RJG's Math for Molders course defines ratios and how they are used in the plastic injection molding industry. Specifically, formulas are taught to calculate intensification ratios, compression ratios, and screw L/D ratios. The lessons feature practical examples related to plastic injection molding, opportunities for practice, and an assessment. Suggested prerequisite: Math for Molders: Area (Unit 1) Read more

The Volume unit of RJG's Math for Molders course teaches the use of the volume formula to calculate the volume of cylinders, as well as the use of a formula triangle to calculate the specific figures required when transferring molds, ensuring that the correct mold is fitted to the correct machine. The lessons feature practical examples related to plastic injection molding, opportunities for practice, and an assessment. Suggested prerequisite: Math for Molders: Area (Unit 1) Read more

The Area module of RJG's Maths for Moulders course includes lessons on how to use specific mathematic formulas to calculate the area of the most common shapes (squares and rectangles, triangles, circles) as well as irregular shapes and total projected area. The lessons feature practical examples related to plastic injection moulding, opportunities for practice, and an assessment. Read more