Thread: Van Door Motor
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Unread 24-06-2002, 00:00
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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Re: Van Door Motor
Posted by ChrisH at 2/2/2001 11:31 AM EST


Engineer on team #330, Beach 'Bots, from Hope Chapel Academy and NASA JPL, J & F Machine, Raytheon, et al.


In Reply to: Van Door Motor
Posted by Brian on 2/1/2001 7:05 PM EST:



: Our team is attaching a 12 tooth gear to the van door motor. We have drilled a hole to attach it with a pin. The pin isn't the greatest thing every invented. Any ideas? Thanx

You don't say where on the shaft you're mounting the gear. But if it's near the end I'd take advantage of the flat spots in the shaft out there. With a good mill and starting with a 0.25 inch bore on the gear you should be able to make an oblong hole in the gear to match the shaft. "D" shaped holes are the best if you can manage them. Broaching the "D" is the easiest way to get that shape, but we had to get a custom broach made to get it right. I'm not sure you have the resources for that. (If you don't know what broaching is ask your machinist or a metal shop teacher and they'll show you a broach. Once you see one you'll understand)

If you can't manage the D shaped hole, a keyway is the next best thing. Though rather hard to install in the field if you fry a motor.

In my mind pins are just one step above set screws, and we all know that set screws inhale audibly. This is especially true on small diameter shafts like the one you're working with.

Chris Husmann, PE
Team 330 the Beach'Bots



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