As material removed from the job, the tool has to advance relative to the job to cut new areas of the job. This motion is achieved through the feed drive. Importance of a Feed Drives are: 1. The drive: A feed mechanism may be powered by a separate electric motor or from the spindle drive through kinematic links like gears, chain and belt. 2. Feed engaging devices: These may be form or friction clutches, sliding gears etc. 3. Feed reversing devices: While cutting an internal thread the reversing of the feed is usually required. 4. A safety device for protecting the feed mechanism against overload. Many design of engine lathes incorporate a dropping worm to overcome the problem of overloading. 5. A geear train for rapid traverse movements of carriages, tables etc. driven by a separat e electric motor or by high speed shafts in the gearbox. 6. The feed gearbox set at the beginning of the feed.
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