Thread Cutting on Lathe

Thread Cutting

Thread cutting on All Geared Lathe Machine is one of the most important operations performed in a lathe. The process of thread cutting is to produce a helical groove on a cylindrical surface by feeding the tool longitudinally.

Thread Cutting On All Geared Lathe

 1. The job is revolved between center or by a chuck. The longitudinal feed should be
equal to the pitch of the thread to be cut per revolution of the work piece.

2. The carriage should be moved longitudinally obtaining feed through the lead-screw
of the lathe.

3. A definite ratio between the longitudinal feed and rotation of the headstock spindle
should be found out. Suitable gears with required number of teeth should be mounted on the
spindle and the lead screw.

4. A proper thread cutting tool is selected according to the shape of the thread. It is
mounted on the tool post with its cutting edge at the lathe axis and perpendicular to the axis
of the work.

5. The position of the tumbler gears are adjusted according to the type of the thread

6. Suitable spindle speed is selected and it is obtained through back gears.

7. After the process of thread cutting is over, the thread is checked by suitable
gauges.