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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 various motions of the machine are as follows: There are 16 speeds of work table, 8 with the single, and the same with the back gear.

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

This is the position of i when the back gear is not in use, the motion of the cone being communicated to s through i.

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

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

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

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