Enter the total torque transmitted by the shaft and the diameter of the shaft into the calculator to determine the key force.
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Key Force Formula
The following equation is used to calculate the Key Force.
KF = T*2/D
- Where KF is the key force (lbf)
- T is the torque applied to the key (lbf-in)
- D is the diameter of the shaft (in)
What is a Key Force?
Definition:
A key force is the total force, including direct and shear force, acting on a key during operation.
How to Calculate Key Force?
Example Problem:
The following example outlines the steps and information needed to calculate the Key Force.
First, determine the torque applied to the key . In this example, the torque applied to the key is found to be 50 lbf-in.
Next, determine the shaft diameter. For this problem, the shaft diameter is found to be 4 in..
Finally, calculate the Key Force using the formula above:
KF = T*2/D
KF = 50*2/4
KF = 25 lbf
