NEED FOR AUTOMATS Limitation of manually operated lathes • Movement of tool to precise location becomes difficult • Idle time between tool changeover, setting of tool and setting time of workpiece is larger.

AUTOMATS •Bar Feeding Mechanism •Transverse tool feeds •Feed motions of the cutting tools •Turret Indexing Mechanism.

Automatic lathes can be classified as follows: (i) Single spindle automatics (ii) Multi spindle automatics (iii) Chucking machines (iv) Horizontal spindle machines (v) Vertical spindle machines.

In fully automatic lathes, once the machine is set up, all the movements related to the manufacturing cycle and also the loading of blanks and the unloading of machined parts are performed without the operator's participation. In semiautomatic machines, the two latter movements are accomplished by the operator.

Single spindle automatics have only one spindle and they machine one component at a time. •Multi spindle automatics have more then one spindles (4 to 8). Multi spindle machines have higher production rate as compared to single spindle machines.

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