Cut-To-Cut Time; Starting The Tool Change - Siemens SINUMERIK 840D sl Function Manual

W3: Tool change

17.5 Starting the tool change

17.4

Cut-to-cut time

The cut-to-cut time is the period that elapses when a tool is changed between retraction from
the interruption point on the contour (from cut) and repositioning at the interruption point (return
to cut) with the new tool when the spindle is rotating.
Typical cut-to-cut times are as follows:
Typical cut-to-cut times
0.3 to 1 s
0.5 to 5 s
17.5 Starting the tool change
Variants
The tool change can be actuated by:
● T function
● M command (preferably M06)
Parameterization
Which control versions should be effective is defined with the machine data:
MD22550 $MC_TOOL_CHANGE_MODE
Value
0
1
The M command for tool change is defined in machine data:
MD22560 $MC_TOOL_CHANGE_M_CODE
Default setting is 6 (corresponding to DIN 66025).
Note
If the tool offset number is supplied from the PLC or an HMI tool manager, a preprocessing
stop 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 several blocks
are required here in advance for the path calculation.
838
for turning machine with turret
for milling machine with automatic tool changer
Meaning
The T function loads the new tool immediately.
New tool with T function prepared for change and
placed in the tool change position simultaneously
during the machining time.
The M command is used to remove the old tool from
the spindle and load the new tool.
Typical application
Turning machines with tool turret
Milling machines with a tool magazine,
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions