H1: Manual and handwheel travel
3.9 Retraction in the tool direction (JOG retract)
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
195
3.9.4 Tool retraction
General retraction behavior
The tool is retracted by manually traversing the geometry axis specified when selecting JOG
retract in the workpiece coordinate system (WCS). The specification of the retraction
movement can be performed via the traversing keys of the machine control panel (MCP) or
via the handwheel. Retraction is possible within the traversing range limits (working area
limitation, software limit switch, etc.).
The retraction movement can be stopped and started again with NC stop and NC start.
The axes and spindles not involved in the tool retraction can be manually traversed as
required.
Traversing direction
Per default, the retraction movement is only enabled for the positive traversing direction. If
traversing in the negative direction is also to be possible, this must be explicitly enabled:
MD10735 $MN_JOG_MODE_MASK, Bit 8
Retraction behavior for thread cutting (G33) or tapping (G331, G332)
In addition to the geometry axes, a spindle is also involved in the retraction movement for
thread cutting (
G33 or G331/G332). The retraction movement is executed when either the
selected geometry axis or the spindle is traversed.
Retraction using the handwheel
If one of the axes involved in the retraction movement is traversed by means of traversing
key, the handwheel pulses for other axes involved in the retraction movement are ignored.
If handwheels have been selected for several axes and these are moved, the handwheel
pulses are evaluated in the following order:
1. Retraction axis
2. Spindle
3. Axes/spindles not involved in the retraction movement
The pulses of the other handwheels are ignored and only evaluated at standstill of the
preceding handwheels.
Locked functions
During JOG retract, the requirements for the following functions are ignored:
● Spindle start via DB31, ... DBX30
● Traversing of a spindle or axis involved in the retraction via function block FC18
● Switchover of a spindle or an axis involved in the retraction to the PLC-controlled axis
● Changing a spindle or axis involved in the retraction to another channel
● Using a spindle or axis involved in the retraction as main run axis (command axis,
oscillating axis, FC18 / concurrent axis)
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