Programming technological functions (cycles)8.4 Turning - only for G code programsMillingOperating Manual, 03/2013, 6FC5398-7CP40-3BA1 433Parameter Description UnitDA Thread changeover depth (inc)First machine all thread turns sequentially to thread changeoverdepth DA, then machine all thread turns sequentially to depth 2 ·DA, etc. until the final depth is reached.DA = 0: Thread changeover depth is not taken into account, i.e.finish machining each thread before starting the next thread.mmMachining: • Complete, or• from turn N1N1 (1...4) start thread N1 = 1...N or• only thread NXNX (1...4) 1 from N threadsParameters, G code program (thread, face)PL Machining planeParameter Description UnitP • Thread pitch in mm/revolution• Thread pitch in inch/revolution• Thread turns per inch• Thread pitch in MODULUSmm/revin/revturns/"MODULUSG Change in thread pitch per revolution – (only for P = mm/rev or in/rev)G = 0: The thread pitch P does not change.G > 0: The thread pitch P increases by the value G per revolution.G < 0: The thread pitch P decreases by the value G per revolution.If the start and end pitch of the thread are known, the pitch change to beprogrammed can be calculated as follows:|P e2 - P 2 |G = ----------------- [mm/rev 2]2 * Z 1The meanings are as follows:P e : End pitch of thread [mm/rev]P: Start pitch of thread [mm/rev]Z 1 : Thread length [mm]A larger pitch results in a larger distance between the thread turns on theworkpiece.mm/rev2Machining • ∇ (roughing)• ∇∇∇ (finishing)• ∇ + ∇∇∇ (roughing and finishing)
