12-10-2010, 12:49 PM
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AUTOMATIC LATHES
INTRODUCTION
These are machine tools in which components are machined automatically.
The working cycle is fully automatic that is repeated to produce duplicate parts with out participation of operator.
All movements of cutting tools, their sequence of operations, applications, feeding of raw material, parting off, un loading of finished parts all are done on machine.
All working & idle operations are performed in definite sequence by control system adopted in automatic which is set up to suit a given work.
Only operation reqd to be performed manually is loading of bar stock/ individual casting/ forged blanks.
These machines are used when production requirements are too high for turret lathes to produce economically.
Advantages
Greater production over a given period.
More economy in floor space.
More consistently accurate work than turrets.
More constant flow of production.
Scrap loss is reduced by reducing operator error.
During machine operation operator is free to operate another machine/ can inspect completed parts.
SEMI AUTOMATICS
These are turning machines used for chucking work.
In this type of lathes although all movements of w/p (or) tools are automatically controlled, but w/p has to be loaded into & removed from chuck at beginning & end of each cycle of operation.
Machine cycle is automated, but direct participation of operator is reqd to start subsequent cycle, i.e., to machine each w/p.
Operator work is to load w/p or blank into machine, start the ma/c, checks the work, & removes the completed part by hand.
