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NPT carbide threadmill


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I haven't machined a NPT thread in a while, but when I did, we had a set depth value we would go to, mill a plain circle(with proper in/out of course), then comp the tool out until the gauge fit right. In this case, you shouldn't need to put in an angle value, just do 1 revolution or add a finish pass, but if it was a single point cutter you would use the angle value on a prepped hole.

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The thousands of internal pipe threads I have machined, I have never added a value in the taper angle box and never had a problem with the threads. Hmm, maybe I outta try it with the taper angle next time and see what happens. Using the threadmill toolpath and a 3/8-18 NPT, I have used the following parameters (conservative to me, but have worked very well) using an Accupro thread mill (.360" dia, MSC item #02154854). .675" Major Diameter, .5625" Drill Diameter, 11 active teeth, 2100 rpm @ 5 IPM, .611" depth, .055556 pitch, 5 multipasses at .015" with a spring pass.

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