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Technical Information
Thread milling process and technology
Thread milling cutter entry cycles
Linear plunging Helical interpolation (cyl. thread)
With linear plunging of the thread milling cutter into the Helical interpolation is the overlaying of circular and linear
material, a very large angle of contact is created at the movement. Different threads can be produced by the form
milling cutter which leads to long chips and a high loading of overlaying the direction of pitch and the direction of
on the tool. This is particularly the case when the difference rotation of the circular movement.
in diameter between the hole size and the milling cutter is
small. In addition, this method produces a small delay mark. d2 development
This method is not suitable for accurate and small threads. of helical line
1 helix
angle pitch p
2
3
4
5
helix line circumference = x d
90° quarter circle entry cycle Helical interpolation (conical thread)
A 90° entry cycle with a small difference in diameter between In order to produce a perfectly round thread with a NPT
the tool and the thread removes a large part of chip volume thread milling cutter, it is necessary to take into account
during the linear section of the entry cycle. This method is the pitch when NC-progamming. In contrast to cylindrical
therefore only recommended for relatively large differences threads, the machining path is not a 360 circle but four
in diameter between hole size and thread milling cutter segments of a circle. With every one of the four segments
(thread milling cutter TMU). The advantage using this entry the taper is corrected inwards.
method lies in the simple programming and the relatively
short entry path.
pitch p d2 1 1. circle segment
d2 2 2. circle segment
3. circle segment
4. circle segment
Technical 180° semicircle entry cycle
With a 180° entry cycle, the loading on the tool is the lowest
when plunging, as the angle of contact is relatively small
during the complete entry cycle.This method requires a little
more sophistication in programming but has shown to be
the most costefficient when thread milling with theTM,TMC
and DTMC thread milling cutter.
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