Siemens SINUMERIK 840D sl Operating Manual

Also see for SINUMERIK 828D Turning: Diagnostic manual Function manual Equipment manual Programming manual Operating manual

Parameters Description UnitX1 Allowance in X ∅ (abs) or allowance in X (inc) mmZ1 Allowance in Z (abs) or allowance in Z (inc) – (for undercut form F only) mmVX Cross feed ∅ (abs) or cross feed (inc) mm* Unit of feedrate as programmed before the cycle call10.2.5 Thread undercuts (CYCLE940)FunctionThe "Thread undercut DIN" or "Thread undercut" cycle is used to program thread undercutsto DIN 76 for workpieces with a metric ISO thread, or freely definable thread undercuts.Approach/retraction1. The tool first moves to the starting point calculated internally in the cycle at rapid traverse.2. The first cut is made at the machining feedrate, starting from the flank and traveling alongthe shape of the thread undercut as far as the safety distance.3. The tool moves to the next starting position at rapid traverse.4. Steps 2 and 3 are repeated until the thread undercut is finished.5. The tool moves back to the starting point at rapid traverse.During finishing, the tool travels as far as cross-feed VX.Procedure1. The part program or ShopTurn program to be processed has been cre‐ated and you are in the editor.2. Press the "Turning" softkey.3. Press the "Undercut" softkey.4. Press the "Thread undercut DIN" softkey.The "Thread Undercut (DIN 76)" input window opens.- OR -Press the "Thread undercut" softkey.The "Thread Undercut" input window opens.Programming technology functions (cycles)10.2 RotateTurningOperating Manual, 05/2017, A5E40868721 357