(in a lathe) one of several gears for driving the headstock at various speeds.
- backgeared, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use back gear in a sentence
The head stock of a lathe—the back gear in particular—is about as hard a thing to improve as the link motion of a locomotive.
Referring again to Fig. 494, g′ is the pinion to drive the back gear while g receives motion from the back-gear pinion.
Another plan is to let the back gear move endwise and bush its bearing holes with hardened steel bushes.
As shown in the sketch, g is in one of these grooves while h is the other, but when the back gear is in, g would be in h.
Various methods of moving the back gear into and out of gear with the cone spindle gears are employed.