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Unread 23-06-2002, 22:58
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#0047 (ChiefDelphi)
 
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Stub tooth is dangerous but not deadly...

Posted by Joe Johnson.   [PICTURE: SAME | NEW | HELP]


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

Posted on 2/2/2000 3:14 PM MST


In Reply to: More Warning posted by Bill Beatty on 2/2/2000 8:26 AM MST:



Bill,

Good catch, I knew this fact, but I forgot to mention it.

For those who don't know the difference, 'stub' teeth have lower mountains (addendems) and less deep valleys (dedendums) and 'full depth' teeth. The problem with mating one with the other is that the valley of the stub toothed gear is not deep enough to allow the mountain of the full depth gear to pass.

However, life is bad, but it is not too bad. Recovery is possible.

Two paths can be followed:

1) (not as nice as #2 but it will work) Increase the center distance by 0.2 / Diametral Pitch. In the case of the window motor gear this works out to be .2/16 which is 0.012 inches. Not a big deal, but if you don't do it, the gears will just not spin with eachother. One bad thing about this is that you are increasing the amount of 'backlash' in the gear train (beyond what would normally be designed into the gears). All in all , this should be an acceptable work around the stub tooth gear problem.

2) Chuck up the full depth gear in a lathe and take remove 0.2 / Diametral Pitch from the outside RADIUS of the gear (0.4 / Diametral Pitch off the Diameter). This will effectively make the full depth gear a 'half stub' gear in that the mountains will not be as high as a full depth gear even though the valleys are still just as deep as ever. This is my preferred method to make a full depth gear mate with a stub gear. One problem with this method is that you have to be carefull to remove the burr on the top of the gear teeth without damaging the rest of the tooth form. It is tedious, but with a fine file it and patience it can be done.

Good luck.

Joe J.



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  #17   Spotlight this post!  
Unread 23-06-2002, 22:58
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Re: gears....?

Posted by Dan.

Student on team #10, BSM, from Benilde-St. Margaret's and Banner Engineering.

Posted on 2/1/2000 4:39 PM MST


In Reply to: gears....? posted by Janna on 2/1/2000 4:26 PM MST:



Check out Rush Gears (link below.) Never used them, but many have recommended them.
G'Luck
:-Dan


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