Gear reduction question

by dislect
Tags: gear, reduction
 P: 150 hi everyone! i was wondering how gear reduction is done besides connecting a small gear to a larger gear (radius speaking)? In my problem i have a gear - radius:5cm, angular velocity: 1000rpm I have a second gear - radius:5 cm, anguler velocity required: 1 rpm How do i make this happen? do i play with the numer of "teeths" on each gear, say that the first has 1 teeth and the second has 1000? Thanks
 P: 343 The smallest pinions rarely ever have fewer than 12 teeth to avoid under cutting of the teeth during forming. In order to achieve a particular gear ratio, it is necessary to find a number pair, a number quad (for two stage gearing), a number hex (for three stage gearing), etc. which in combination will give the required gear ratio. There are definite procedures for doing this, but most people simple start guessing. Only in rare circumstances is it required to hit a specific gear ratio with great accuracy.
 P: 584 Here are a couple of pages that might help: http://www.teamdavinci.com/understan..._reduction.htm http://www.cs.cmu.edu/~rapidproto/mechanisms/chpt7.html