Siemens SINUMERIK 840D Function Manual page 698

H1: Manual traversing
17.12 Retraction in the tool direction (JOG retract)
The axes and spindles not involved in the tool retraction can be manually traversed as required.
Switching the coordinates systems is possible (MCS ⇔ WCS).
Traversing direction
The retraction movement is only enabled for the positive traversing direction by default. If
traversing in the negative direction is also to be possible, this must be explicitly enabled:
MD10735 $MN_JOG_MODE_MASK, bit 8 = 1
Retraction behavior dependent on processing type and tool type
The following retraction motion is possible depending on the machining type and the active tool
type:
● Thread cutting (G33) or tapping (G331,G332):
Irrespective of the tool type, traverse movements are only possible in the retraction axis (tool
axis)
● Tool type 2xx (drilling tools): traverse movements are only possible in the retraction axis
(tool axis)
● Tool type 4xx (grinding tools): No retraction motion possible
● Tool type 5xx (turning tools): No retraction motion possible
Retraction movement for thread processing
For thread cutting (G33) or tapping (G331,G332) the retraction movement is performed if either
the retraction axis or the spindle is moved.
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 following functions are blocked or are not performed:
● 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
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA