Page 120 - MILLING_CATALOG_INCH_2022_P361-P592

USER GUIDE
THREAD MILLING TOOLS

Entering the Workpiece

When a sudden load is applied to the cutter as it enters Depth Per Pass
the workpiece the cutter may be broken, or damage may Based on the number of passes, the table below
be incurred. If entering is smooth, then the load on the presents ISCAR's recommendations for depth per
tool will increase gradually and the surface will remain pass, which is expressed as a percentage according
unmarked. to the total depth that is required to be removed.
There are three ways to initially enter the
workpiece: radial entering, tangential entering by Number of Radial Passes
arc, tangential entering by linear movement.

Radial Entering
The cutter enters the workpiece in a straight
line towards the center workpiece axis.
This is the simplest method, but also
the least recommended because the
hugging angle may be is too large.
Internal Threading

DW DC 1 2
4 3

Depth Per Pass

External Threading

DW 2 3 1 4

DC

1 pass 2 passes 3 passes

75% 65% 75%

DW - Workpiece diameter
DC - Cutter Diameter
1-2: Straight line entry
2-3: Helical movement during one full orbit (360°)
3-4: Straight line exit
100% 100% 100%

480 ISCAR