[alistairsam]

[QUOTE=torana68;774147]

Originally Posted by alistairsam

Hi,

have a look at this
http://bftgu.solarbotics.net/tutorials_mech_torque.html

torque.....the twisting force, you should consider an overload clutch as well or over engineer the drive to compensate.

Thanks for the link. very useful, especially torque in geared systems.
I will over engineer by around 10 to 20% and use a clutch for safety, but i just wanted to know if the torque rating of the gearbox i've chosen is within my load requirements as there are multiple types of gearboxes with the same ratios but different torque ratings due to materials used and construction.

I could use a torque wrench to turn the RA shaft with full load and work out what the required torque is and work backwards along the gear train.