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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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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 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

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

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

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