7RWDORIIVHW:RUNRIIVHWFRDUVH%DVLVRIIVHW:RUNRIIVHWILQH6=6&RRUGLQDWHWUDQVIRUPDWLRQ: :&60&60Figure 4-1 Zero offsetsWhen the machine zero is not identical to the workpiece zero, at least one offset (base offsetor zero offset) exists in which the position of the workpiece zero is saved.Base offsetThe base offset is a zero offset that is always active. If you have not defined a base offset, itsvalue will be zero. The base offset is specified in the "Zero Offset - Base" window.Coarse and fine offsetsEvery zero offset (G54 to G57, G505 to G599) consists of a coarse offset and a fine offset.You can call the zero offsets from any program (coarse and fine offsets are added together).You can save the workpiece zero, for example, in the coarse offset, and then store the offsetthat occurs when a new workpiece is clamped between the old and the new workpiece zeroin the fine offset.NoteDeselect fine offset (only 840D sl)You have the option of deselecting the fine offset using machine data MD18600$MN_MM_FRAME_FINE_TRANSSee alsoActual value window (Page 40)4.8.1 Display active zero offsetThe following zero offsets are displayed in the "Zero Offset - Active" window:● Zero offsets, for which active offsets are included, or for which values are entered.● Settable zero offsets● Total zero offsetSetting up the machine4.8 Zero offsetsTurningOperating Manual, 05/2017, A5E40868721 89