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main shaft

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noun Machinery.
  1. the principal shaft of a motor, transmission, etc. (distinguished from jackshaft).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for main shaft

Historical Examples

  • A is the pump; B the eccentric on main-shaft to work it by steam power.

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    Frank W. Doughty