Gear Question

Sorry if this is the incorrect place to post this question.

If you have something like a motor turning a shaft at 60 revolutions
per min, how would you figure out what kind of system of gears you
would need to either increase the RPM's by a factor of 2, 5 and 10.
And what kind to decrease the RPM's by the same. I'm would think you
could use a myriad variety of gears but I'm looking for the most
simple.
That is a system that would double the RPM's.
A system that would half the RPM's.
A system that would increase the RPM's 5 times.
A system that would increase the RPM's 10 times.
A system that would decrease the RPM's 5 times.
....ect.

I'm sure it is a basic way to do one and from that I could probably
figure out the rest. If you can help me, I'd be most grateful.

eVe

Dear eVe GiiDiiOn:


eVe GiiDiiOn wrote:

Known: output ratio
Given: gear drive
Formula: output ratio = nt_i / nt_o
with nt_i = number of teeth on input gear
with nt_o = number of teeth on output gear

You just need to make sure the two gears have the same pitch, etc.
[Only registered users see links. ]

You can also do this job with a pair of pulleys and belt.

You can also do this job with a variable speed motor.

You might ask future questions of this type on sci.engr.mech.

David A. Smith