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Re: Rhino track failier?
The glossiness and types of fractures I can tell from these pictures indicate the material may be glass-filled. Definitely would make the pulleys super stiff, but definitely suseptible to impact failures, as the glass in the resin makes the plastic surprisingly brittle.
Additionally, while the spec'd total tolerance may be 0.0005" (0.0127mm for those of us versed in those units), this is a basically an unmoldable range. It would be tough for an injection mold to hold that steady over many thousands of parts, even things like the HVAC of the factory or running at night vs running at day could have that effect. I envision few suppliers would sign up for that tight of a tolerance.
That being said, molded press fits have been common in AM and VP parts for years without issue- so this may not be part of the failure at all. Just wanted to add some realism to the discussion regarding tolerance and injection molding.
-Brando
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