There are two basic parameters, torque and power to be fully understood to properly apply the drives.
TORQUE (T)
It is an applied force which tends to produce rotation. Torque (torque) without rotation is called static torque, since there is no movement.
Torque is measured in lb-in or lb-ft. It is the product of a force in pounds (lb) by the distance in inches (in) or feet (ft) from the center point of rotation. The following figure shows 120 lb-in (12 inches x 10 pounds) or 10 lb-ft of torque.
Because most of the power transmission is based on rotating elements, torque is important as a measure of the effort required to produce work.
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