This thread interference is made possible primarily by their tapered design. Both thread types rely on thread interference for tight, robust connections. Visually, NPT and NPTF pipe threads look identical. NPT (National Pipe Taper) is a general-purpose tapered pipe thread, and NPTF (National Pipe Taper Fuel) is a dryseal tapered pipe thread. Both thread types also have installation differences based on gauging the threads for conformance before installation. While NPT threaded plastic fittings are standard and readily available, there are distinctly specific installation and sealing recommendations for plastic versus metal installation. Both thread types use a thread taper that provides solid and vibration-resistant connections. NPT and NPTF pipe thread applications range from electrical conduits to high-pressure piping carrying natural gas and chemically aggressive liquids. 04 = ~.414 The closest thing to that number is the outside diameter of pipe D which is. So my question is, did I mess something up in Mastercam? Am I using the wrong size hole in Mastercam? Nothing in the Handbook is even close to what the diameter would be.

So I started slowly increasing the diameter with my wear offset and I ended at like -.04 when I hit my right size. If I change the depth, I assume Mastercam will adjust the toolpath to adjust for taper to hit the sized hole that I modeled.ĭrilled with a Q drill. I did not override mahor or minor diameter calculated thinking that since the thread mill already has the taper in the tool, Mastercam would adjust automatically. So I went to the Machinery's Handbook, and E1 (Handtight Engagement 0.3736), is the size that I modeled the hole diameter as in Mastercam. I bought a multi flute thread mill with the taper already in the tool and modeled the tool to the manufacturing specs in Mastercam. I've threadmilled normal threads before but not NPT threads.

So I had this job I had to make some internal 1/8 - 27 NPT threads.

Thread milling npt mastercam