Thread: Spur Gears Again
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Unread 24-06-2002, 04:03
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#0047 (ChiefDelphi)
  
Join Date: May 2001
Location: Pontiac, MI
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66 is the smallest I would go.
Posted by Joe Johnson at 05/04/2001 5:33 PM EST


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.


In Reply to: Spur Gears Again
Posted by Matt Reiland on 05/04/2001 3:59 PM EST:



I have screwed this up for two year in a row, but I pass on this advice free of charge.

Basically, the smallest gear you should try to mate with that motor should allow the bearing that goes around the shaft for the gear to clear the motor can.

I am pretty sure the motor is approx 45mm in diameter.

A good size shaft is 1/4 inch in dia. which means the bushing OD would be 3/8ths or about 9mm.

So... the total center distance should be at least 54mm/2 or 27mm.

The center distance is (Ngear+Npinion)*module/2
Solving for Ngear:

Ngear = 2*Centerdistance/module - Npinion

Ngear = 2*27/.7 - 12 = 65.XXX

I would round up to 66 teeth (this would be a gear with about the same diameter as the motor -- not too bad to deal with).

It would also give you a pretty good ratio in the first stage of the transmission (66/12 = 5.5).

That is my recommendation.

Joe J.


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