Interrupter Wheel, 66 mm Diameter 

This is the interrupter wheel for the 7x14 spindle tachometer.

This interrupter wheel can be used to adapt the PN 1684 spindle tachometer to machines with a larger spindle diameter.

The wheel is 66 mm (2.60") in diameter, 1 mm (0.04") thick, and has a 30.2 mm (1.19") hole in it. There is a 5 mm keyway in the bore. The diameter at the root of the teeth is 56 mm (2.20"). There are 40 teeth.