Base tangent length deviation factor

The backlash allowance conversion factor according to DIN 3960 is used to convert the backlash allowance factors  A_w entered by the user into the tooth thickness allowance factors A_s used in the calculation of the tooth clearance according to the following formula:

 As = Aw / cos(α_n)

If the user is to enter the tooth thickness allowance factors A_s, this factor must be set to 1.0. The tooth thickness allowance factors A_s correspond to the values from the backlash allowance and tolerance series according to DIN 3967.