- (on a lathe) a rotating horizontal screw for moving the tool carriage along the work at a constant rate.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for lead screw
The 24-tooth gear goes on the spindle stud and, the 40-tooth gear on the lead-screw.
As previously explained, lead-screw S is only used for feeding the carriage when cutting threads.
The carriage should not be disengaged from the lead-screw after starting the cut, the tool being returned by reversing the lathe.
The dial, therefore, would enable the carriage to be engaged with the lead-screw at points equal to a travel of one-half inch.
Suppose that nine threads to the inch are to be cut and the lead-screw has six threads per inch.
- a threaded rod that drives the tool carriage in a lathe when screw cutting, etc