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Unread 05-01-2016, 08:21
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Paul Copioli Paul Copioli is online now
President, VEX Robotics, Inc.
FRC #3310 (Black Hawk Robotics)
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Re: Sonic Shifter - recent feedback?

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
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In full disclosure I am the President of VEX Robotics, a division of Innovation First International.