NEW TOOL MILLS 0-80 THREADS.

Since an unusual, tiny single-thread cutter first went into thread-milling test use at the Kansas City division of Allied Corp's Bendix Aerospace in late 1983, the new tool form has proved itself in dozens of critical applications, especially in cutting threads into very small holes - as small as No. 0-80. In conventional thread milling on non-NC machines, whether by single- or multiple-thread cutters, the workpiece is generally rotated at the same time the cutter rotates. Planetary thread-milling machines (non-NC) have been used when parts are cumbersome: the workpiece remains stationary while the machine's two eccentric quills both rotate the cutter and orbit it around the threadform centerline. Both techniques, though, require specialized machinery.