[indieFan]

I have the motor and a set up for the testing. However, I was given the following spec to be tested for:

9 oz/in

Is this the same as 9 oz-in? If not, what is the difference between the two numbers?

Unfortunately, the person working on this particular subsystem has not been able to explain any of the calculations he has made to arrive at the above requirement, only telling me that it is correct. What I do know and understand of the subsystem is that there is a "conveyor" belt that will be driven completely by the friction created between the belt and a roller. (i.e., No timing pulley.) When discussing the issue of the forces to be calculated, I was told by the person that the forces between the metal contacts of the roller "axle" (very small rod) and the side wall support were more important than that between the belt and the roller. Can someone explain why this would be true? I've been having a real hard time comprehending this since I always thought that the real driving force in these calculations would be the friction force, much like a tire against a road.

Thanks again,
indieFan