Thread mills are made from solid carbide and most machine taps are made from HSS (high speed steel). However, thread mills will last much longer than taps, reducing downtime, and they will not break and get stuck in the hole like a tap can. Thread mills can be a much more cost-effective solution than machine taps, especially in difficult materials or applications.

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Indexable thread mills are generally for larger diameter threads, however there is a cross over between solid and indexable thread mills at around M16. Solid carbide thread mills will offer greater rigidity (indexable tools and mainly HSS shanks), often have longer flute lengths and more flutes, so they can be faster than most indexable thread mills. However, they can also be very expensive compared to indexable thread mill inserts above M16. Indexable thread mills offer the flexibility of being able to machine different thread forms and pitches with one holder. This makes them a very cost-effective solution. They are also exceptionally cost effective for large diameter threads. Some indexable thread mills are available with multiple inserts for higher performance applications, or with very long holders for long reach applications. In summary, it depends entirely on the tools being used and the application. For help and support in choosing whether to use a solid carbide thread mill or indexable thread mill, please contact our technical support team on 01924 869665.

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Many modern CNC machine tools come equipped with a thread milling cycle, however if your machine does not have a pre-programmed thread milling cycle that does not stop you from thread milling, however your CNC machine does need to be capable of simultaneous 3 axis machining. If your machine does not have a thread mill cycle, you can simply use the Vargus GENIUS software which will generate your thread milling programme for you for whatever machine control you require.Why are thread mills more expensive than taps?

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This depends entirely on the application, machine tool, material or budget. Thread mills have many benefits over taps, however on some applications taps can be faster, more cost effective and easier to programme than thread mills. For help and support in choosing whether to use a thread mill compared or a tap please contact our technical support team on 01924 869665.

There is no hard and fast answer to this question. Some thread mills are far faster than standard machine taps, some high-performance machine taps are faster than thread mills. It depends entirely on the application and the tools being used. However, thread mills are far safer to use than taps and can prevent scrapping of workpieces due to broken tools.

Thread milling has become an increasingly popular alternative to tapping and thread turning for many applications due to the advantages that it delivers. Whilst it is not suitable or cost effective for every application, it has many benefits compared to tapping or thread turning:

Thread mills are a high precision tool yet most customers use them in ER collet chucks and without through coolant. By using a hydraulic chuck, shrink chuck or any other holder with <0.003mm run-out, you will reduce vibration and therefor tool life and thread quality. Secondly, by using a through coolant thread mill it clears the chips out of the hole and prevents ‘double cutting of the swarf’ which can damage or mark the threads.

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Coated carbide thread mills for general thread milling applications. Helical flutes spread the cutting load & reduce vibration.

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