jackshaft

plural jackshafts

1. A common mechanical component used to transfer or synchronize rotational force in a machine.

   Synonyms: countershaft

2. A wheelless axle used to turn the wheels of a locomotive.

   Final drive is by reduction gears on the jackshaft, and through flycranks and rods to the wheels.

   1950 October, “S.R. Diesel-Mechanical Shunter”, in Railway Magazine, page 692

present singular third person jackshafts · participle present jackshafting · participle past jackshafted · past jackshafted

1. To transfer or synchronize rotational force by means of a jackshaft.

   Synonyms: countershaft