Hand Fine Spur Gear 12T (218631)

Hand Fine Spur Gear (Polar # 218631)

Machines:  Polar 72 EL, Polar 72 CE, and Polar Power Max guillotine paper cutters, after machine serial number 4551001.
Size: The outside diameter measures 2.97" (75.5 mm).  Its overall width is approximately 1.57" (40 mm).  It has a 19 mm diameter bore (.75"), and a 6 mm wide keyway.

This 12 tooth gear is used in the backgauge hand fine adjustment mechanism. The teeth are curved round "lobes", not conventional gear teeth. This gear is machined from delrin and it mates with G320.