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# Gear Question

## Gear Question - Physics Forum

### Gear Question - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
10-25-2006, 07:00 AM
 eVe GiiDiiOn Guest Posts: n/a
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
#2
10-25-2006, 07:17 PM
 dlzc Guest Posts: n/a
Gear Question

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

 Tags gear , question

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