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Unread 23-06-2002, 23:26
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wheel hub kit and sprocket

Posted by james at 1/22/2001 4:14 PM EST


Coach on team #694, PULSE, from stuyvesant high school and AOL Time Warner.



the wheel hub kit and sprocket from small parts do not fit right off the shelf. are we supposed to mill the bore to fit? the diagrams don't indicate that this needs to be done. please help anyone??

thanks


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they are supposed to

Posted by Ken Leung at 1/22/2001 5:34 PM EST


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


In Reply to: wheel hub kit and sprocket
Posted by james on 1/22/2001 4:14 PM EST:



: the wheel hub kit and sprocket from small parts do not fit right off the shelf. are we supposed to mill the bore to fit? the diagrams don't indicate that this needs to be done. please help anyone??

: thanks

Our team receive those wheel hub and they fit right into the wheelchair wheels perfectly... since the hubs are supposed to have one size, I believe your problem might be caused by defection. You should order some more wheels to see if that's the problem, and you should have spare wheels anyway. And no, we didn't need to mill the bore to fit... unless the hubs are defected. The best thing to do right now is the do precise measurment on the hubs AND the wheels and compare them to the diagrams... and ask Small Parts if you need clarification on the diagram, or post on this forum.
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Re: they are supposed to

Posted by james at 1/22/2001 6:26 PM EST


Coach on team #694, PULSE, from stuyvesant high school and AOL Time Warner.


In Reply to: they are supposed to
Posted by Ken Leung on 1/22/2001 5:34 PM EST:



asked the wrong question i guess. the sprocket doesn't fit the way it's diagrammed. the wheel hub fits, but according to the diagram, the sprocket then goes on after that. the sprockets bore sizes are 3/8, 1/2 etc, but the diagram shows it fitting on the wheel which is around 1". to fit a sprocket on the hub, do we have to mill the sprocket?

thanks for answering.

james ng
p.s...where are you guys from?


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Re: they are supposed to

Posted by Eric Reed at 1/22/2001 9:14 PM EST


Coach on team #481, NASA Ames / De Anza High School, from De Anza High School and It could be you!.


In Reply to: Re: they are supposed to
Posted by james on 1/22/2001 6:26 PM EST:



I think you have to drill three holes in the sprocket and attach it to the wheel mounting. The sprocket sort of becomes part of the wheel, and is not directly connected to the shaft. Anyway, this is what we did. We had a heck of a time getting the holes in the right place, though. Better get some advice from a good machinist.

Eric
Team 481


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Re: they are supposed to

Posted by Ken Leung at 1/22/2001 11:15 PM EST


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


In Reply to: Re: they are supposed to
Posted by james on 1/22/2001 6:26 PM EST:



According to the diagram, there are supposed to be three Nylon spacers between the sprocket and the wheel hub. And Eric is right, the sprocket becomes part of the whole wheel. So with the spacers in place, the sprocket should not be touching the wheel at all... Therefore it doesn't matter if the bore of the sprocket is smaller than that part of the wheel. The reason it looks that way on the picture is because the sprocket is covering the part of the wheel, so you can't really see what's going on behind it.

And james, we are from Gunn High School, Palo Alto, California. Feel free to visit our web page.


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ken is my hero.

Posted by Anton Abaya at 1/23/2001 1:46 AM EST


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


In Reply to: Re: they are supposed to
Posted by Ken Leung on 1/22/2001 11:15 PM EST:



ours hasnt arrived.

ty for the info.

-anton
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nah...

Posted by Ken Leung at 1/23/2001 3:35 AM EST


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


In Reply to: ken is my hero.
Posted by Anton Abaya on 1/23/2001 1:46 AM EST:



There are only so many little questions I can answer, base on the fact that I am still a student... Mostly I can only answer with obivious answers, about rules and some part about robots. When it comes to the deep engineering problems, we all should still rely on people like Joe Johnson and Raul for complete, right to the point answers... Just listening to dicussion from you two inspired me even more about engineering and directed me toward the huge world outside the robotics competition. And now I can't wait to head into the more critical courses of Mechanical Engineering. I can't thank you enough for providing all these helps to the people out there.

Consider me your greatest fan...



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still...you help a lot

Posted by JVN at 1/23/2001 2:00 PM EST


Student on team #250, GE Dynamos - Capital District Robotics Team, from Shenendehowa High School and General Electric.


In Reply to: nah...
Posted by Ken Leung on 1/23/2001 3:35 AM EST:



however modest you might be, you have helped out quite a few people...and we all thank you for it...

~John #250


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