back gear

American  

noun

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

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Other Word Forms

• backgeared adjective

Example Sentences

The worm-gear has 40 teeth, and the worm is triple threaded, thus making a back gear equivalent to 40⁄3, or 131⁄3 to 1.

From Project Gutenberg

The steps of the cone should be so proportioned that the belt will shift from one to the other, and have the same degree of tension, while at the same time they should give a uniform graduation or variation of speed throughout, whether the lathe runs in single gear or with the back gear in.

From Project Gutenberg

The cone pulley and back gear is of the full proportion and power of an eighteen-inch lathe. c is an ordinary lathe carriage fitted to slide on the bed, and be operated by hand-wheel d and a rack pinion as usual.

From Project Gutenberg

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 Project Gutenberg

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 Project Gutenberg