Siemens SINUMERIK Series Function Manual

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W3: Tool change16.6 Tool change pointExtended FunctionsFunction Manual, 03/2013, 6FC5397-1BP40-3BA1 797The M command for tool change is defined in machine data:MD22560 $MC_TOOL_CHANGE_M_CODEDefault setting is 6 (corresponding to DIN 66025).NoteIf the tool offset number is supplied from the PLC or an HMI tool manager, a preprocessingstop STOPRE must be inserted at a suitable point. STOPRE must be avoided, however,when tool radius compensation (G41 / G42) or SPLINE interpolation is active, since severalblocks are required here in advance for the path calculation.ReferencesFor further information about M functions which also apply to tool change M06 (e.g.extended address, time of output to PLC, auxiliary function groups, behavior during blocksearch, behavior during overstore) see:Function Manual, Synchronized Actions16.6 Tool change pointTool change pointThe selection of the tool change point has a significant effect on the cut-to-cut time(Page 796). The tool change point is chosen according to the machine tool concept and, incertain cases, according to the current machining task.Approaching a fixed pointFixed positions on a machine axis stored in machine data can be approached by means ofthe "fixed-point approach" function. This can be used to define and control one or severaltool change points.There are two fixed point approach options:● Approaching a fixed point in JOGThe machine user starts the "fixed-point approach" in the JOG mode with the traversekeys or the handwheel (see Section "Approaching a fixed point in JOG (Page 183)").● Approaching a fixed point with G75Fixed point approach is called using the command G75 from the part program.References:Programming Manual, Fundamentals, Section: Additional commands > Approach fixedpoint (G75)