Page 80 - THREADING CATALOG

USER GUIDE
THREAD TURNING There are several methods for thread machining by turning operations. The workpiece can rotate clockwise or
Thread Turning Methods

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
Internal
External
External
Internal
Left-Hand Threading
Left-Hand Threading
Right-Hand Threading
Right-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.
AlternativeThread Turning Methods*
External Internal External Internal
Right-Hand Threading Right-Hand Threading Left-Hand Threading Left-Hand Threading
LH

LH
RH

RH
* Change to negative anvil see anvil selection guide for assistance
The threading tool is adjusted according to the production method.
The cutting tools differ in the direction in which they are recommended to work.
(LH) Left-Hand Tool (RH) Right-Hand Tool

Right-hand tools are recommended to work from right to left and left-hand tools are recommended to work from left to right,
so that the sides of the pocket prevent movement of the insert during the turning operation.
The tool can be positioned upside down to allow easier chip evacuation.

Thread Turning Methods
External Right-Hand Threading External Left-Hand Threading
RH*
RH

RH* LH

*Change to negative anvil see anvil selection guide for assistance

ISCAR
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