Using Nine9 MCC Mill for Tapered Pipe Threads (Rc 1/4–19) on SUS304, High Productivity Without Pre-Milling

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• Using Nine9 MCC Mill for Tapered Pipe Threads (Rc 1/4–19) on SUS304, High Productivity Without Pre-Milling

Client: Can Nine9 MCC mill be used for machining#Tapered Pipe #PT (Rc) 1/4 –19 internal threads on SUS304 stainless steel? Nine9 Engineering: Yes, absolutely. The Nine9 MCC thread mill can directly cut Rc (PT) 1/4–19 internal threads in SUS304 without pre-milling the taper. Recommended setup: Insert: R05510-09516-32 (6-flute MCC insert) Vc: 60 m/min S: 2000 rpm f: 0.005 mm/tooth (≈60 mm/min) Client: Why MCC is efficient here? Nine9 Engineering: 6-flute insert = higher #productivity: With six effective flutes, the feed per revolution is multiplied (fz × 6), enabling a noticeably faster cycle while maintaining excellent finish and gauge control. Client: Why this works on taper threads? Nine9 Engineering: The MCC toolpath uses helical interpolation with a taper (1:16 for Rc threads). The tool simultaneously moves in XY and Z while slightly changing radius per pitch, generating the 55° Whitworth tapered profile. You do not need to pre-mill the taper. Ensure proper pilot hole and verify with Rc 1/4–19 gauge. More information about MCC Threading Mill >>  https://nine9.jic-tools.com.tw/MCC-Threading-Mill.html

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