Servo torque conversion kg/cm to oz. - RC Groups
Oct 17, 2007, 08:47 PM
Tri-City park flyer
Discussion

# 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 .
 Oct 17, 2007, 09:01 PM User 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).
 Oct 17, 2007, 09:07 PM Inciting Riots Try google, I did find one a couple months ago.
 Oct 17, 2007, 10:06 PM Stress Be Gone Try Convert 4.1 at xxx.joshmadison.com/software freeware, excellent convertor program for LOTs of stuff.
Oct 17, 2007, 10:11 PM
Stress Be Gone
Try Convert 4.1

Found at

freeware & very good, see photo

### Images

 Oct 17, 2007, 10:44 PM Registered Taranis User 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. Latest blog entry: Taranis: Aileron-To-Rudder Mix.
 Oct 17, 2007, 11:14 PM 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.
 Oct 18, 2007, 05:23 AM Registered User Or the US could finally go metric... *ducks* (Not that kgcm for torque is very metric...)
 Oct 18, 2007, 07:21 AM Registered Taranis User Why is it not very metric? Latest blog entry: Taranis: Aileron-To-Rudder Mix.
 Oct 18, 2007, 08:15 AM Registered User 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".
 Oct 18, 2007, 08:22 AM Registered User Just type "2 kg/cm to oz/in" in the Google search box and you'll get the answer.
Oct 18, 2007, 08:30 AM
Registered User
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!
 Oct 18, 2007, 06:52 PM Tri-City park flyer Thanks for the info. Looking at the Hitec servo numbers would help... if I was looking to get Hitec servos.
 Oct 18, 2007, 07:15 PM Registered Taranis User 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" Latest blog entry: Taranis: Aileron-To-Rudder Mix.