Quote:
Originally Posted by Captainfab
I think one of the reasons for the finer toothed sector gear is to slow down the action of the regulator with the given speed of the motor. I'm thinking that if you were to fit a coarser tooth gear on the sector shaft, the window may travel too fast. It might be better to see about changing the driven 'gear'. Of course that is all relative to the speed of a given motor.
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I'm not sure that is true. I think the speed of glass is a case of the diameter of the gear (or radius), speed of that gear (I.E. the worm gear inside pitch). In other words, lets take an extreme case-if two separate gears both turn 10RPM, but one gear is 2 inches in diameter, one gear is 12 inches in diameter, the bigger gear will be slower regardless of pitch of teeth or sector...
Another way to look at it; if the gear were unrolled and laid flat, it would have a fixed length (2 * Pi * R). the travel of the sector per one revolution of the gear would be that length, regardless of the pitch.