GH41A Cast Iron Change Gear 1-1/2" Tube Note: Because the efficiency of

Note: Because the efficiency of a worm gear drive depends on the lead angle and number of starts on the worm

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• Splined Hub

GH41A Cast Iron Change Gear 1-1/2" Tube Note: Because the efficiency ofBoston 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