Tip #6: Modeling Slope Error Tolerance of Injection Molded Parts

Injection molded plastic parts typically have ripples on the surface that result from hand polishing the tool, sinking of the plastic, etc. This can be referred to as slope error tolerance where the slope error is the deviation of the normal at any point on the injection-molded part when compared to the designed part. To first order, you can simulate this effect as follows:

First, define a Harvey model in ASAP® with the first two parameters always 1 and -13. The third perameter is the average slope error deviation divided by 10.

MODEL
HARVEY 1 -13 0.1 !! simulates 1 degree random slope error

Next, apply the model to each surface on the part:

OBJECT ..
INTERFACE ... !! Define optical properties as normal
ROUGHNESS MODEL .1

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