Threadinsert

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Threading insertsize chart

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Thread turning is another option for making internal threads when tapping conditions are not optimal, such as parts with large diameters or in difficult-to-cut materials. Thread turning is most often performed on a lathe with a cylindrical workpiece and uses an indexable carbide insert with a boring bar. When boring bars are too large for the size of hole, a solid carbide threading bar can be used. In thread turning, the workpiece rotates as the cutting tool moves axially to create a continuous thread path. Like thread-milling, it normally takes multiple passes to generate a full thread profile. Unlike a thread-milling cutter, all the material removal is accomplished with only one cutting edge engaged. Removing only a fraction of the thread depth in each pass keeps the cutting edge from being overloaded.

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