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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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As shown in the sketch, g is in one of these grooves while h is the other, but when the back gear is in, g would be in h.

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

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 Joshua Rose

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 Jay Hambidge

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 Joshua Rose

In this machine the motion for both drilling and turning is received by belt on the cone pulley shown on the right, which is provided with back gear similar to that of a lathe.

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

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