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

• countershafting noun

Etymology

Origin of countershaft

First recorded in 1860–65; counter- + shaft

Example Sentences

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

From Time Magazine Archive

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

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

Kawasaki offers optional parts for the KX250, including carburetor tuning parts, ignition rotors, a larger countershaft sprocket, aluminum and steel rear sprockets, solid brake discs for wet racing conditions and a 20-inch front wheel.

From Time Magazine Archive

The carriage c is fed along the bed as an ordinary lathe carriage, and the emery wheels are revolved from an overhead countershaft.

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