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Unread 23-06-2002, 23:29
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Need Help on Shaft Mounting...

Posted by Anton Abaya at 1/23/2001 2:08 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! .



Assuming we wanted to mount some fixed shafts for wheels to spin on, what have you guys done in the past?

Last year we had mounts that were unberaably difficult to disassemble when it was needed and so it brought more problems than expected.

Say we wanted to mount the shaft on both sides (it's supported by two mounts), what would you guys recommend for easy disassembly and easy installation? The less machining the better.

-anton
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My favorite method.

Posted by Matt Berube at 1/23/2001 8:09 AM EST


Engineer on team #49, Delphi Knights, from Buena Vista High School and Delphi Automotive.


In Reply to: Need Help on Shaft Mounting...
Posted by Anton Abaya on 1/23/2001 2:08 AM EST:



My personal favorite method is to construct two ridgid mounts, drill STRAIGHT though the both of them, and use one of those nifty ground shoulder bolts. You can then put your bearings inside of the wheel and mount your sprocket/gear to the side of the wheel to make it turn.

Matt B.
T49
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Re: My favorite method.

Posted by Justin Stiltner at 1/23/2001 8:36 AM EST


Student on team #388, Epsilon, from Grundy High School and NASA, American Electric Power, Town of Grundy.


In Reply to: My favorite method.
Posted by Matt Berube on 1/23/2001 8:09 AM EST:



: My personal favorite method is to construct two ridgid mounts, drill STRAIGHT though the both of them, and use one of those nifty ground shoulder bolts. You can then put your bearings inside of the wheel and mount your sprocket/gear to the side of the wheel to make it turn.

: Matt B.
: T49

But if you are Mounting wheel chair wheels with the hub kits I would just drill a hole through the mounts and drill a hole through each end of the shaft then push the shaft through one mount put your wheel on the shaft and then put the shaft through the other mount and put cotter pins through both. Because with the wheelchair wheels The shaft does not need to spin.

That is how we did it anyway. And it is really easy to take apart.

Justin Stiltner
Team #388
Grundy Va,

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shaft collars

Posted by Ken Leung at 1/23/2001 4:24 PM EST


Student on team #192, Gunn Robotics Team, from Henry M. Gunn Senior High School.


In Reply to: Re: My favorite method.
Posted by Justin Stiltner on 1/23/2001 8:36 AM EST:



: But if you are Mounting wheel chair wheels with the hub kits I would just drill a hole through the mounts and drill a hole through each end of the shaft then push the shaft through one mount put your wheel on the shaft and then put the shaft through the other mount and put cotter pins through both. Because with the wheelchair wheels The shaft does not need to spin.

Beside from mounting the shaft so it won't move around, you also want to keep the wheel from shifting around on the shaft... It is true that it's free spinning on the shaft, but if somehow the wheel move sideways because of some side load, it's going to rub against the mounts and therefore reduce the power of to the wheel.

For us, we use shaft collars to keep the shaft in place, but also we have another two collars inside the mount beside the wheel, and kind of sandwich it at the center of the shaft. And it's pretty easy to take this apart, just use allen wrench to loosen the collars, and the shaft comes right out. Since the surface of the collar is much less then the mount, when the wheels are rubbing against it, there won't be as much friction slowing it down. And with the collar in place, it also leave you some room above and below it for chains to come in and out, kind of acting like a spacer.


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