What are the functions of tailstock in lathe machine?

Tail stock is located on the lathe inner ways at the right hand end of the bed. The tail stock used for supports the other end of the work when it is being machined between centers. It holds a tool for performing operations such as drilling, tapping and reaming, etc…

To accommodate the different lengths of work and the body of the tail stock can be adjusted along with the ways chiefly by sliding it to the desired position where it can be clamped by bolts and plates.

The upper casting of the body can be moved to away from the operator by means of the adjusting screws to offset the tail stock for taper turning and to realign the tail stock center for straight turning.

The body is bored to act as the barrel and which carries the tail stock spindle that moves in and out of the barrel by screw when the tail stock hand wheel is turned.

Tail stock spindle:

tailstock in lathe machine

The front of the spindle has a taper hole into which the dead center or other tools are fit. The screw thread is left handed and so that the clockwise rotation of the hand wheel causes the spindle to advance.

The anticlockwise rotation causes the spindle to be drawn inward and ultimately the end of the screw strikes the back of the dead center fitted into the hole.

To remove tools from the spindle therefore only necessary to back up on the hand wheel until the spindle end is nearly inside the casting.

The spindle has a key way in the underside that mates with a small key fitted on the barrel to prevent rotation. After the adjustment is made the spindle is clamped in position by tightening the locking bolt on split lug.

Other features sometimes incorporated on tailstocks are graduated spindle and micrometer dials on the hand wheels for accurate length setting and felt wiper pads on the base and spindle.