Controlled Products Systems Group 6300-080 - Manual (Page 26)

1.6.2 Arm Length Calculations
After the operator has been installed, use the following steps to determine the correct crank arm and
connecting arm lengths for the installation. The measurements are from the pivot point to the
pivot point of each arm – they are not the overall length of the arm.
1. Measure the distance from point A1 to point A2 (44.5 inches in our example). Divide
this measurement by 2 (22.25 inches in our example). The result is the length of the
crank arm assembly from the operator output shaft (Point C) to the pivot point on the
connector assembly.
2. Measure the distance from point A1 to Point C (62.25 in our example). Subtract from
this measurement from the length of the crank arm assembly that was determined in
step 1. The result is the length of the connecting arm (40 inches in our example).
Page 26 6300-065-E-4-08