Page top

page-top

Lead Contents

Limit Switch: Calculating Operating Force (OF)

FAQ No. FAQ02990

Primary Contents

Question

How do you calculate the operating force (OF) when changing the length of an adjustable roller lever in Limit Switches?

Answer

Use the following equation:

OF' = (OF x R)*/R'

*(OF x R): Fixed torque

Where OF is operating force, R is roller lever length, R' is the desired roller lever length, and OF' is operating force for the desired roller lever length.

For example, using the WLH12 Limit Switch with a roller lever length of 89 mm will result in the following OF':

(9.81 N x 38 mm)*/89 mm = Approx. 4.19N

*9.81 N: Standard OF
38 mm: Lever length for standard OF

In the above equation, the standard OF for a WLH12 with a roller lever length of 38 mm is 9.81 N (the OF listed in the datasheet), so the fixed torque is calculated as OF x R.

Dividing this by R' (89 mm in this example), which is the desired roller lever length, gives us the OF', which is the operating force for a Limit Switch with the desired roller lever length.