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Topic: Servo torque calculator? (Read 843 times) previous topic - next topic

jeffmorris

Is there a servo torque calculator? I need a servo that can lift a 1-foot long leg weighing 1 pound.

zoomkat

First you will need to determine how the weight is distributed along the length of the leg. Googling terms like "calculate beam torque" might provide ueful info.
Google forum search: Use Google Advanced Search and use Http://forum.arduino.cc/index in the "site or domain:" box.

jackrae

If your 1 foot long leg is of an evenly distributed mass along its length then its centre of gravity will be half-way along the beam. 

Torque therefore is 1lb x 0.5ft or 0.5lbft or 6lbin. 

To convert into metric units simply use the relevant conversion factors of 1lb = 454gm and 1inch = 2.54cm. 

Hence 0.5lbft = 6lbin = 6919gmcm = 6.919kgcm

and to make it truly metric bring in gravity where force = mass x acceleration  or Newtons = kg x 9.81m/s/s

hence your 0.5lbft = 6.919 x 9.81 / 100  = 0.679 NM  (Newton Metres)

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