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Old Oct 17, 2007, 08:47 PM
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Servo torque conversion kg/cm to oz.


Anyone know of a calculator online, or way to calculate converting servo torque ratings?

Some companies rate them like 1.5 kg/cm. This means nothing to me .
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Old Oct 17, 2007, 09:01 PM
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Multiply the torque (in kg/cm) by 13.88 and the result will be the equivalent in oz/in. So for your example, the torque will be about 21 oz/in. (1.5x13.88).
Old Oct 17, 2007, 09:07 PM
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Try google, I did find one a couple months ago.
Old Oct 17, 2007, 10:06 PM
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Try Convert 4.1 at

xxx.joshmadison.com/software

freeware, excellent convertor program for LOTs of stuff.
Old Oct 17, 2007, 10:11 PM
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Try Convert 4.1

Found at

xxx.joshmadison.com/software

freeware & very good, see photo
Old Oct 17, 2007, 10:44 PM
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It helps in figuring out how to do the conversion if you write the units correctly. Units written as kg/cm and oz/in imply that torque is force divided by distance, but it's not. Since torque is actually multiplied by distance (you get more leverage with a longer arm), the correct units are kg-cm and ounce-inches.

Since there are about 35.2734 ounces in a kilogram and 2.54 centimeters in an inch, the correct conversion factor is 35.2734 / 2.54 = 13.88 ounce-inches/kg-cm, as rmteo said.
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Old Oct 17, 2007, 11:14 PM
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Deletedfor proving Nauga wrong
you could also just look at the ratings of Hitec servos on their website... They list In-oz and kg-cm.
Old Oct 18, 2007, 05:23 AM
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Or the US could finally go metric... *ducks*

(Not that kgcm for torque is very metric...)
Old Oct 18, 2007, 07:21 AM
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Why is it not very metric?
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Old Oct 18, 2007, 08:15 AM
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It is metric, but it's not the correct unit for torque. kg is mass, not force. Force would be N.

I probably should have said that it's not very "SI".
Old Oct 18, 2007, 08:22 AM
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Just type "2 kg/cm to oz/in" in the Google search box and you'll get the answer.
Old Oct 18, 2007, 08:30 AM
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Quote:
Originally Posted by Ralph Weaver
Just type "2 kg/cm to oz/in" in the Google search box and you'll get the answer.
Nifty! But then, definitely use the correct units, i.e. kg cm and oz in!
Old Oct 18, 2007, 06:52 PM
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Thanks for the info.

Looking at the Hitec servo numbers would help... if I was looking to get Hitec servos.
Old Oct 18, 2007, 07:15 PM
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Right, Markus. If you use Ralph's method you'll get the answer "2 (kg / cm) = 179.191727 oz / in", which is technically correct but has nothing to do with torque. I'm not sure what sort of quantity is represented by force divided by distance, but Google doesn't seem to care.

The correct answer for torque, which Google gives for your expression, is "2 (kg cm) = 27.7747732 oz in"

If you substitute Backwing's value of 1.5, you get "1.5 (kg cm) = 20.8310799 oz in"
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