Help with Moments in Mechanism

[leonardo_alex]

I'm developoing one mechamical device, that we'll put two nutrunner in one gear. One spur gear will rotate the gear and put the nutrunner and one position. Each nutrunner will fix one bolt with 70Nm.

I need put one motor in pinion, but i need consider the moments to define de size of the motor.

Someone could tell me how I can calculate the result moment in the gear or how to define the best motor?

 

[Lnewqban]

we'll put two nutrunner in one gear.

Welcome!
Could you describe how those three things connect to each other?

 

[leonardo_alex]

Basicly, the two nutrunner are assembly in the gear blue. And the pinion (white) will receive a motor to rotate the gear to put the nutrunner in correct position (it's just a setup). The gear(blue) have a bearing.

 

[jack action]

Someone could tell me how I can calculate the result moment in the gear

By doing a free body diagram.

how to define the best motor?

Motors are sized by their power output. There are some limits on Torque and RPM depending on the design, but that can be offset with a gearbox because power is constant when transferring from one mechanism to another.

Basic info found on Youtube:

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