Sandvik Coromant Threading - Manual (Page 38)

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2. Applications – Thread milling
Thread milling – main considerations
To achieve the best results in a thread milling operation, always
consider the following points.
- Choice of cutting diameter
A smaller cutting diameter will help to achieve higher quality
threads.
- Tool path is important
• Tool path will give right or left hand threads, using down- or up-
milling
• Always engage and retract the thread mill in a smooth path, i.e.
roll in and out of cut
- Be aware of feed per tooth
Always work with small feed per tooth values (very small hex) to
achieve best quality.
- Always calculate the correct feed required by the machine
software
To ensure the correct insert load.
- Several infeed passes may be needed
In diffi cult applications, it may be necessary to separate the opera-
tion into several infeed passes to achieve higher quality threads.
- Dry machining is the fi rst choice