Siemens SINUMERIK 840D sl Operating Manual

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Parameter Description UnitX1 orX1αEnd point X ∅ (abs) or end point in relation to X0 (inc) orThread taperIncremental dimensions: The sign is also evaluated.mm ordegreesZ1 End point Z (abs) or end point in relation to Z0 (inc)Incremental dimensions: The sign is also evaluated.mmLWorLW2orLW2 = LRThread advance (inc)The starting point for the thread is the reference point (X0, Z0) brought forward bythe thread advance W. The thread advance can be used if you wish to begin theindividual cuts slightly earlier in order to also produce a precise start of thread.Thread run-in (inc)The thread run-in can be used if you cannot approach the thread from the side andinstead have to insert the tool into the material (e.g. lubrication groove on a shaft).Thread run-in = thread run-out (inc)mmmmmmLR Thread run-out (inc)The thread run-out can be used if you wish to retract the tool obliquely at the end ofthe thread (e.g. lubrication groove on a shaft).mmH1 Thread depth (inc) mmDPorαPInfeed slope as flank (inc) – (alternative to infeed slope as angle)DP > 0: Infeed along the rear flankDP < 0: Infeed along the front flankmmInfeed slope as angle – (alternative to infeed slope as flank)α > 0: Infeed along the rear flankα < 0: Infeed along the front flankα = 0: Infeed at right angle to cutting directionIf you wish to infeed along the flanks, the maximum absolute value of this parametermay be half the flank angle of the tool.DegreesInfeed along the flankInfeed with alternating flanks (alternative)Instead of infeed along one flank, you can infeed along alternating flanks to avoidalways loading the same tool cutting edge. As a consequence you can increase thetool life.α > 0: Start at the rear flankα < 0: Start at the front flankD0 Initial plunge depth – (only for ∇ and ∇ + ∇∇∇ under "Manual Machine")If you want to rework some threads, input the initial plunge depth D0 (inc.). This isthe depth that was reached during a previous machining.By inputting the plunge depth, you avoid unnecessary idle cuts when reworking thethreads.mmD1 or ND(only for ∇ and∇ + ∇∇∇)First infeed depth or number of roughing cutsThe respective value is displayed when you switch between the number of roughingcuts and the first infeed.mmU Finishing allowance in X and Z – (only for ∇ and ∇ + ∇∇∇) mmNN Number of noncuts - (only for ∇∇∇ and ∇ + ∇∇∇)Programming technology functions (cycles)10.2 RotateTurning368 Operating Manual, 05/2017, A5E40868721