Page 283 - THREADING CATALOG

USER GUIDE

Entering the Workpiece

A sudden load is applied to the cutter when it enters Internal Threading
the workpiece and as a result the cutter may be
broken, or a mark will remain. If entering is smooth, THREAD MILLING
then the load on the tool will increase gradually
and the surface will remain “clean”. There are three
ways to initially enter the workpiece: radial entering, 2
tangential entering by arc, tangential entering by line.
DW DC 1 6 3
Radial Entering 4
The cutter enters the workpiece in a straight line
to the center workpiece axis. This is the simplest 5
method, but also the least recommended,
because the angle of the hugging is too large.
Internal Threading External Threading

2

DW DC 1 2 3 1
4 3 DW
4
DC

5
External Threading DW - workpiece diameter
DC - cutter diameter
1-2: rapid approach
2-3: tangential entry by arc
3-4: helical movement during one full orbit (360°)
4-5: tangential exit by arc
DW 2 1 5-6: rapid return
3 4
DC Tangential Entering by Line
This method is very simple, with all the advantages
of the tangential entering by arc method,
but is used only for external threading.
DW - workpiece diameter External Threading
DC - cutter diameter
1-2: straight line entry 2 1 DC
2-3: helical movement during one full orbit (360°) 4 3
3-4: straight line exit

Tangential Entering by Arc (recommended)
The tool enters the material in an arc movement, DW
and at the end of the thread the tool also extends in
an arc movement from the material. This method is
recommended because the cutter gradually enters the
material and the load on the tool increases gradually.

DW - workpiece diameter
DC - cutter diameter
1-2: tangential line entry
2-3: helical movement during one full orbit (360°)
3-4: tangential line exit

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