Definition of jackshaft in English:

jackshaft

noun

  • A small auxiliary or intermediate shaft in machinery.

    • ‘The tip jack shaft comprises at least one group of contact links which are arranged in a comb-type manner on the wide side of the tip jack shaft.’
    • ‘Using Dave's lathe, we made a new coupler that would keyway inside our fulcrum and jack shafts. This removed much of our runout.’

Pronunciation:

jackshaft

/ˈjakˌSHaft/