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### Topic: Servo torque calculator? (Read 1 time)previous topic - next topic

#### jeffmorris

##### Oct 12, 2012, 02:56 am
Is there a servo torque calculator? I need a servo that can lift a 1-foot long leg weighing 1 pound.

#### zoomkat

#1
##### Oct 12, 2012, 06:56 am
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.
Why I like my 2005 Rio Yellow Honda S2000  https://www.youtube.com/watch?v=pWjMvrkUqX0

#### jackrae

#2
##### Oct 12, 2012, 09:53 pm
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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