Page 124 - MILLING CATALOG p319-550

THREAD MILLING TOOLSEntering the workpiece USER GUIDE

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

Radial entering

The cutter enters the workpiece in a straight
line to the center workpiece axis.
This is the simplest method, but also
the least recommended because the
angle of the hugging is too large.

Internal Threading

DW DC 12
43

External Threading

DW 2 1
3 4
DC
2 passes 3 passes
1 pass

75% 65%
75%

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

440 ISCAR