### Author Topic: Gears, Sprockets, and Chain confusion  (Read 633 times)

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#### cjholloway

• Beginner
• Posts: 1
##### Gears, Sprockets, and Chain confusion
« on: September 18, 2012, 08:26:49 PM »
In the Gears, Sprockets, and Chains section of this web site at:  http://www.societyofrobots.com/mechanics_gears.shtml#compoundgears,
it states:
something is not correct here since the units on both sides of the equation are not the same - can anyone help?

« Last Edit: September 18, 2012, 09:12:55 PM by cjholloway »

#### fridgid

• Jr. Member
• Posts: 16
##### Re: Gears, Sprockets, and Chain confusion
« Reply #1 on: September 20, 2012, 10:37:16 PM »
I assume they're trying to state that the force from the motor torque (N or lbs) times the radius is equal to the weight force (again N or lbs) times the radius.
This equation might better be stated as:
r x F = r x F

If you are using spec motor torque from a sheet, the units would be in N-m or lb-ft (or some derivative of those two) and would be equal to r x F (meters or feet times newtons or lbs)

The motor torque is:
T = r x F

Motor torque in those equations is a force not a torque, so you are correct.