Page 114 - Threading_Handbook

2.10 Thread Turning Methods
THREAD TURNING There are several methods for thread machining by turning operations. The workpiece can

rotate clockwise or counterclockwise and the cutting tool is fed toward or away from the
chuck.
The most common and recommended methods for external and internal, right-hand and
left-hand threading is shown in the sketch below.

Recommended Thread Turning Methods
External
Internal
External
Internal
Right-Hand Threading Right-Hand Threading Left-Hand Threading Left-Hand Threading
LH

LH
RH
RH

The alternative methods for external and internal, right-hand and left-hand threading shown
in the drawing below are not recommended. By using the alternative method, the tool is
less stable during thread machining, which can cause vibration, poor surface finish and
decrease tool life.

Not Recommended Thread Turning Methods
External Internal External Internal
Right-Hand Threading Right-Hand Threading Left-Hand Threading Left-Hand Threading

LH

LH
RH

RH

114 ISCAR