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Roller on track

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I'm working on my thesis and try to simulate a roller on a track, which moves through a curve.

The roller follows the track and the curve, but as soon as I apply a force on top of the plate, the whole

roller "falls" trough the track, where it stands at the beginning, even with gravity turned off.
Between the rolls and the track I assigned a contact.
The problem is probably the joint between the rolls and the track, because they are defined as translational 

(free) - which works without load, but as I mentioned, not with one.
So, what is the best way to get it solved? Goal is to get the reactions in the curve and do a topology optimization on it.

Thanks for support (y)


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