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Re: Direct drive minibot - output diameter?
It sounds like you're on all the right tracks! :-)
First of all, I'll preface this by saying that 1519's minibot has not been optimized... what we're doing are likely not the best ways of doing things!
Our minibot uses direct-drive and can climb the pole in about 1.3 seconds. To answer your questions, we use a 1/4" shaft with surgical tubing of 1/4" ID and 3/8" OD simply slid on over the shaft. It is "press fit" (snug, but by no means a true press fit!) onto the pinion gear of the Tetrix motor with an 8-32 set screw to help lock it in place on the pinion. That hasn't failed once in 1 regional plus quite a lot of practice, although making sure your set screws are tight is always important! The other end of the shaft is supported by a bearing.
We are considering increasing the diameter of the motor and trying to remove a couple ounces (we weigh in at 2.3 pounds, currently) to increase our speed slightly. Really though, it's all about reliability... the primary reason we went with this design was the magnet attachment to the tower - no clamping or grasping involved.
Feel free to ask any questions you like! Best of luck!
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Student: 2006-2010 (#1519)
Mentor: 2011-Present (#1519)
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