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roller on an arced tube
marten_hutchison
Member Posts: 29 EDU
I want to roll a bit of round tubing ~1" with a 300" radius and us it for a track for a roller. How do I mate that in an Assembly to show the roller rolling on the surface of the tube?
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John_P_Desilets
Onshape Employees, csevp Posts: 236 
Hello @marten_hutchison
I like to use gear relationships in situations like this. This example is similar to a planetary gear.
I created a construction line in the part studio that went from the center of the roller to the center of the tube.
That construction line was inserted into the assembly and was mated to rotate at the arc center of the tube.
Next, the roller was mated to the end of the construction line with a revolute mate.
Last step, creating the gear relationship between the construction line and the roller.
Let us know if this helps. Good luck!
Onshape Document https://cad.onshape.com/documents/617484d2a877cf914ed12ea3/w/00566171815a4357382aa15a/e/04d6f5d5083c796c93a41a63
7
Answers
I like to use gear relationships in situations like this. This example is similar to a planetary gear.
I created a construction line in the part studio that went from the center of the roller to the center of the tube.
That construction line was inserted into the assembly and was mated to rotate at the arc center of the tube.
Next, the roller was mated to the end of the construction line with a revolute mate.
Last step, creating the gear relationship between the construction line and the roller.
Let us know if this helps. Good luck!
Onshape Document https://cad.onshape.com/documents/617484d2a877cf914ed12ea3/w/00566171815a4357382aa15a/e/04d6f5d5083c796c93a41a63