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Re: Gear Sliding down Ramp
Sorry, but those actually are completely different plastics for the application.
The coefficients "look similar", but going from 0.28 to 0.38 [as quoted earlier in thread] is a 30% increase in friction!
Textured FRP or textured ABS are both much better choices than smooth polycarb, if you can't get HDPE in either smooth or "orange peel". Consider bringing the gear to the store to test your substitute-of-choice before buying?
(Our smooth HDPE works great, I haven't tested our textured ABS)
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