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Unread 25-01-2017, 15:14
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Re: Gear Sliding down Ramp

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Originally Posted by Pandaboy1293 View Post
Does anybody know what the CoF of FRP? My team is using and I'm concerned that it might not work for what we need it to.
Take a piece of FRP put a gear on it... lift it up on one end and record the angle at which the gear begins to slide. The tangent of that angle is the STATIC friction coefficient. That can be compared to other static coefficients. The static coefficient of friction is always greater than the kinetic coefficient of friction. Remember that these coefficients are based on two materials....so there is no "Coefficient of Friction" for FRP.... it would have to be FRP and carpet, or FRP and wood or something...

good luck!!

If anyone actually does this for both FRP and the orange peel HDPE I would be interested in seeing what that number is.
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Unread 25-01-2017, 16:54
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Re: Gear Sliding down Ramp

Quote:
Originally Posted by Bob Steele View Post
If anyone actually does this for both FRP and the orange peel HDPE I would be interested in seeing what that number is.
Not those numbers, but we did measure the CoF of a gear with an actual FRC (2015) carpet yesterday (laying flat) using the well-known ramp method, finding it to be 0.43*. Static and dynamic were indistinguishable; once the gear started it moved at a slow steady rate down the ramp. As the gear weighs 18.4 oz per the game manual, expect to have a frictional force of about 8 oz.

* 39" long piece of plywood backing, hand raised, tape measure measurements, so you might want to put around a +/- 0.02 on it.
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