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kumar narendra

How to calculate torque?


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Dear Kumar Narendra, 

In order to calculate the Torque required to make any rigid body move in the desired direction we must have clear cut idea of the motion. Here, you need to provide us the diameter of the screw shaft that will make the saddle do the motion. This screw shaft actually transfers the powers output from the motor (in the form of Torque) to the power for Saddle for translation in the particular direction ( in the form of force). 


Thus, once we know the diameter of the screw shaft and load acting on the screw threads due to the weight of the saddle, we can find the torque using " d/2 * force equivalent".

This is the minimum torque that a motor should be able to produce.


Once you know this Torque, you can easily find the RPM of the screw from the Translatory speed of the saddle. This will help you find the Power Required.


I can solve all the things mathematically ( in the form of expressions) if required.


For more details and easy to make designing and calculation visually enhancing, you may start using CAD tools. You may visit some of these websites for more details:





I can send you the details of some websites as well that provide you the details how to make use of CAD models to make such calculations easy to understand.

Thanks and Regards.


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You should provide more detail.   But if we assume some data i.e the diameter of the screw shaft to be used to move the saddle is 0.3 m, then one rotation will move the saddle by 2*3.1415*.15=0.94 m. 

For 2m/60sec it will require more than 2 rotation/min.

Let the rpm 2.5, diameter 0.3m, mass of saddle 3500kg= 34335N force

Torque= 34335*0.3=10300.5N-m

Neglecting other factors like friction, mechanical loss etc. 

Power required=(2*3.1416*2.5*10300.5)/60=2697 watt=2.7kW.

Hope it will be helpful.


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Who said there was a screw? Did I miss something?


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