Thread turning cuts internal and external threads on a lathe or CNC turning centre using a single-point indexable insert, rather than a tap, die or thread mill. It's the standard method for producing threads on turned components where the thread forms part of a larger turned profile.
Insert profiles. Full profile inserts cut a complete thread form in one pass and are matched to a specific pitch. Partial (multi-point) profile inserts cover a pitch range with one insert geometry, trading some finish quality for flexibility. Standard thread forms covered include ISO metric, UNF, UNC, NPT and BSP.
Grades and coatings. Carbide grades and PVD/CVD coatings are selected by material: uncoated or TiN-coated grades for mild and free-machining steels, TiAlN-coated grades for stainless and higher-temperature alloys, and CBN or ceramic tipped options for hardened steel threading.
Toolholders. External thread turning uses a shank-style holder sized to the machine's tool post. Internal thread turning uses a boring bar sized to the minimum bore diameter and thread length, with bar diameter and stick-out kept as short as rigidity allows to control chatter.
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