Steel Angle

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How to calculate torque properly in this application ?

Hi, I am an avid outdoor grill man, but now I want to expand into rotisserie cooking of lambs and pigs on a simple spit design. I know I'd prefer adjustable speed, but actually a slow (1-3 rpm) would work. Since I have a surplus store around, I'd like to purchase a small gearmotor to use. I remember the equation for basic torque was TP/JG, but how do I really determine the torque required to turn about a 20-30 lb. lamb/pig about 48" long and about 20" in diameter? The smaller the set up the better, as I can make it portable. I don't want the DC Gearboxes and chain and sprocket designs. Waaaay too bulky. I use a 1-1/4" dia. solid chrome shafting for the spit, and I tie the carcass with wire onto it. I have welded steel angles for stands to hold above oak wood. I just want a motor selected and I will weld a simple motor mount for it.

There are two components of torque required:

a) overcome frictional losses throughout the mechanism
b) offset worst case load imbalance as the food rotates

The first you can control by having good fitting parts and bearings and keeping things clean, and the second by setting the rotisserie up carefully so that the mass moment about the axis of rotation is as close to zero as possible, i.e., the rod passes through the center of mass of the critter.

Estimate both of the above first and then you'll be able to select a sensible motor and gearbox.

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