countershaft

American  

[koun-ter-shaft, -shahft] / ˈkaʊn tərˌʃæft, -ˌʃɑft /

noun

Machinery.

1. jackshaft.

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countershaft British  

/ ˈkaʊntəˌʃɑːft /

noun

1. an intermediate shaft that is driven by, but rotates in the opposite direction to, a main shaft, esp in a gear train

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Other Word Forms

Derived Forms

• countershafting
  noun

Etymology

Origin of countershaft

First recorded in 1860–65; counter- + shaft

Example Sentences

The countershaft remains in the exact same position, however, which means the engine has rotated down in front�ultimately lowering the bike�s center of gravity.

From Time Magazine Archive

This shaft drives a countershaft that rotates, and, in turn, transmits rotation to the propshaft.

From Time Magazine Archive

When changing rear sprockets, it's always a good idea to check the condition of your chain as well as the countershaft sprocket.

From Time Magazine Archive

The chain reaches its tightest point when there suspension is compressed so that there's a straight line between the rear axle, swingarm pivot, and countershaft sprocket.

From Time Magazine Archive

This arrangement gives six spindle speeds, and double this number is obtained by using a two-speed countershaft overhead.

From Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. by Jones, Franklin D.