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Unread 20-01-2016, 11:11
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Paul Copioli Paul Copioli is offline
President, VEX Robotics, Inc.
FRC #3310 (Black Hawk Robotics)
Team Role: Engineer
 
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Re: Heat/Friction of 775 + Versaplanetary

Quote:
Originally Posted by timytamy View Post
Lots of good info/thoughts.


From the sounds of it the most probable explanation is alignment issues. However since we've pulled this gearbox apart and put it together multiple times, I don't think it's a simple user error. We'll get the students to swap out the motor plate tomorrow and see how that goes.

One common thing I have seen people do is get the input housing and output housing rotated 90 degrees from where they should.

The bolt patterns for the motor mounting and the VP assembly holes are not on the same diameter, but are close enough that they can be brute forced to "work".

The easy way to tell is to make sure the side bolt holes on the input and output slice are facing the same direction. If they are 90 degrees apart, then you will have problems.

Finally, if you think there is just something wrong with the alignment, then please contact our support. With the tolerances so tight on these gearboxes sometimes a few parts won't mate quite like intended.

As a side note, in the first year we actually sold pre-assembled single stage gearboxes and tested them for current draw. However, strong customer feedback was that the customer wanted to only buy the 1:1 (aka input and output + hardware) and buy the planetaries and ring gears separately. Once this happened, full testing was no longer possible and we needed to rely on our tolerances of the individual parts.

Any, I hope this helps you determine what is going on.

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