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Unread 05-01-2016, 15:35
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AKA: Chris Bale
FRC #5712 (Gray Matter)
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Re: Sonic Shifter - recent feedback?

Quote:
Originally Posted by Paul Copioli View Post
BoilerMentor,

Were you guys using the old ball shifter shaft without the pin in it or the new shaft?

I ask because the press fit in the original shaft would allow the deflection you speak of but the new shaft would most definitely not.

Also, a cantilevered shaft with the proper bearing spacing behind it is a perfectly legitimate design strategy especially with the cantilevered gear so close to the external bearing face.

Additionally, this is the first example of a failure like this that we have seen with the 3 CIM shifter so I really would like to get more information from you.

PM me if you would like me to email you.

Again, this failure mode is not normal in the typical 3 CIM ball shifter use case (even with your ratios you are within our normal use case).

Thanks,
Paul

I was wondering if someone from Vex would drop by this thread. Glad to hear this issue is an unusual/unique failure mode. Makes me feel better about our teams continued use of Ball Shifter Gearboxes (which as I've said already, we've been very happy with so far).