GB43B Cast Iron Change Gear 28 Teeth a spring loaded pressure plate

a spring loaded pressure plate (magnet armature) presses against the rotating discs

the SNASTRS has an eccentric locking bearing insert

Friction force stops and holds the motor shaft

Spring-lid oil cap can be positioned 4 ways

GB43B Cast Iron Change Gear 28 Teeth a spring loaded pressure plateBoston Gear change gears are used primarily on machine tools to provide different cutting speeds while using a constant speed input. All Boston Gear change gears are manufactured with a double key to accept the compound steel bushings that connect two gears together, allowing them to spin on an intermediate shaft. The change gears we stock range from 20 tooth through 128 tooth gears, in one tooth increments, depending upon the diametrical pitch, for a