OfiTE 112-00 - Lubricity Test Calculations; Coefficient of Friction and Lubricity Coefficient

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Lubricity Test
Calculations - Coefcient
of Friction
Torque Shaft Lever Arm
Torque Bushing
Lock Nut
Lubricity Block
1.5 Inches from Center of Block to Center
of Torque Bushing
150 Inch-pounds (Torque Wrench Reading)
1.5 Inches (Torque Shaft Lever Arm)
=100 Pounds
Torque Reading
100
Coefcient of Friction = =
Coefcient of Friction =
Where:
F = The frictional force required to slide the block and ring surfaces across
each other at a given rate and is measured by the number of amperes
required to turn the test ring at a prescribed number of revolutions per
minute.
W = The load or force with which the test block is pressed against the test
ring through the torque arm. The standard test calls for 150 in-lb of
force, but the center of the test block is 1.5 inches from the center of
the torque bushing, resulting in an actual force of 100 lb applied.
F
W
F
W