Thread: spur gears & fishers ...newbie question...
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Unread 23-06-2002, 23:17
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Re: spur gears & fishers ...newbie question...
Posted by ChrisH at 1/22/2001 2:01 PM EST


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


In Reply to: spur gears & fishers ...newbie question...
Posted by Anton Abaya on 1/20/2001 12:41 AM EST:



: can someone tell me what the "pitch 20" means in relation to spur gears? in the small parts catalog, they came in 20, 32, and 48 pitch series...


Pitch is short for diametral pitch. The short answer is the diametral pitch is the number of teeth per inch of diameter. So a 1" gear with 20 pitch would have 20 teeth. The same gear with 8 pitch would have 8 teeth. In the later case they would be pretty big teeth at that.

Another important gear number is the pressure angle. That's a little harder to explain without pictures. The important thing to remember is that for two gears to mesh properly the pitch and pressure angles must BOTH match. The standard pressure angles are 14 1/2, 20 and 25 degrees.

I'm not sure about any of the numbers for the FP motors.

Chris Husmann, PE
Team 330 th Beach 'Bots


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