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Thread tools \ Technical introduction – thread milling

Types of thread milling cutter

We distinguish between the following types of thread milling cutter:
Multi-range thread milling cutter without collar recess
The simple construction of the multi-range thread milling cutter makes it a cost-eff ective tool for milling
female threads. With this type of cutter, two to three thread sizes can be produced at the same pitch above
the specifi ed nominal dimensions. Please note the relationship between milling diameter and thread size.

Multi-range thread milling cutter with collar recess
The multi-range thread milling cutter with collar
recess is suitable for universal application. The
collar recess enables very deep threads to be
milled. With this type of cutter, all thread sizes can
be produced at the same pitch above a nominal
dimension.
Process steps for thread milling cutter with collar recess:
① Tool moves to initial position, centred above drill hole
② Start of thread milling with descending loop
③ Milling of tread with subsequent ascending loop
④ Start of second thread milling program with descending loop
⑤ Milling of thread with subsequent ascending loop
1
2 ⑥ Movement to initial position and end of machining procedure
3
4
5
6
Thread milling cutter with countersinking step
The thread milling cutter with countersinking step
is characterised by the combination of countersink-
ing and thread milling. With this type of cutter, two
to three thread sizes can be produced at the same
pitch above the specifi ed nominal dimensions.
Process steps:
① Tool moves to start position centred on hole
② 90° bevel countersink
③ Begins thread milling with descending loop
④ Thread milling with subsequent ascending loop
⑤ Moves to start position and ends machining
1
2
3
4
5
Micro-thread milling cutter
Micro thread milling cutters allow threads to be
produced reliably from M1 up to a thread depth of
5xD. Here, we diff erentiate between two tool geom-
etries: A universal geometry covering all material
groups up to 1500 N/mm and a hard machining
2
geometry, developed for hardened materials up to
63 HRC. With hard machining, the thread milling
cutter is used in anti-clockwise rotation M04 to
achieve the optimum service life.
Process steps:
① Tool moves to start position centred on hole
② 90° arc in
③ Thread milling
1
2 ④ 90° arc out
3
4 ⑤ Final position
5
Thread milling cutter with thread cutting insert
The advantages of thread milling are particularly apparent with larger threads. Due to the enormous cost of
the solid carbide cutting material over the diameter range of 20 mm, supports made of steel or solid carbide
and fi tted with a solid carbide cutting insert can be used. With high projections or deep threads, a support
made from solid carbide should be used to ensure suffi cient rigidity. If the correct cutting insert has been
selected, male threads can also be created. The cutting inserts are all in a full profi le design and enable the
production of high-precision thread.
Thread milling system with front milling cutter insert
The development of the thread milling system with front milling cutter insert has enabled the production
of medium to large thread through a reliable process. Here, two support designs are also available in steel
and solid carbide. In terms of cutting inserts, both partial and full-profi le plates are available. Partial profi le
plates allow threads to be created with diff erent pitches, and full-profi le plates allow precise threads with
one pitch.

Source: Hahn+Kolb Werkzeuge GmbH
Technical data subject to change. www.iconridge.com
Availability subject to country specific rules and regulations. 239

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