Bar Feeding Mechanism

Bar Feeding Mechanism

Bar Feeding Mechanism - When workpieces are to be machined from the bar stock on, capstan or turret lathes, it is necessary that some arrangement must be there for feeding the bar stock forward (for the next piece) after each finished workpiece is parted off. The bar may be pushed forward manually by hand.

But this arrangement takes more time, because the spindle and the long bar must come to a dead stop before any adjustment can be made. The other method of bar feeding which pushes the bar forward immediately after the collet chuck releases the work without stopping the machine.

Bar Feeding Mechanism

This method consumes less time as compared to manual bar feeding and the bar can be fed without stopping the machine. The method, however, suits to small machines only. The rotating sleeve mounted on the guide bar carries the rear end of the bar stock. The other end of the bar stock passes through the spindle to project outside the collet chuck.

Under the action of wire rope and weight, the sleeve and bar stock have a tendency to move to right i.e. towards the headstock and thus out from the collet chuck. After the finished piece has been parted off, the chuck opens and thus the bar stock automatically moves forward and rests against the bar stop fitted on the turret.