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Suggested Speeds & Feeds |
Widia GTD (formerly Greenfield)PM Plus Thread MillsSuggested Speeds and Feeds
* To adjust inches per minute for internal threads: If D1 is the major diameter of the thread to be cut and d1 is the diameter of the cutter, then calculate the programmed feed rate by taking ((D1-di)D1) X (calculated feed rate (IPM) from above) Example: To cut a 5/8-18 thread with a 3/8 dia., 4 flute cutter in Cast Iron the numbers above yield a feed rate of 12.3 IPM. (1536 RPM x .008 ipr). The programmed feed rate would be ((.625-.375)/.625)x12.3 = 4.9 IPM. |
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