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back gear

American  

noun

  1. (in a lathe) one of several gears for driving the headstock at various speeds.


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The head stock of a lathe—the back gear in particular—is about as hard a thing to improve as the link motion of a locomotive.

From Scientific American Supplement, No. 643, April 28, 1888 by Various

Motion to the drill spindle is conveyed by belt from a pulley on this same live spindle, hence the same cone pulley and back gear are utilized for either drilling or turning.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua

The back gear is arranged to drive the spindle direct without the power requiring to be transmitted through a shaft, which induces vibration.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua

Gallagher pulled the reversing lever into the back gear and sent the failing steam whistling into the chilled cylinders with cautious little jerks at the throttle.

From Empire Builders by Hambidge, Jay

Another plan is to let the back gear move endwise and bush its bearing holes with hardened steel bushes.

From Modern Machine-Shop Practice, Volumes I and II by Rose, Joshua

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