Supplementary Conditions - Siemens SINUMERIK 840D Function Manual

H1: Manual traversing
17.12 Retraction in the tool direction (JOG retract)
17.12.10

Supplementary conditions

Incremental measuring systems
The user must ensure that machine axes with incremental measuring systems are clamped
with sufficient speed in the event of a power failure to prevent a change to the last position,
known and saved by the control. Otherwise the assumed position when the control is restarted
differs greatly to the actual position of the machine axis. Drive-autonomous retraction must also
not be activated for these axes.
A detailed description of the automatic restoration of actual positions after the next start of the
control (Power On) can be found in:
References:
Basic Functions Function Manual, Section "R1 Referencing" > "Automatic restoration of the
machine reference"
Drive-autonomous retraction
The "Drive-autonomous retraction" function must not be activated for machine axes involved in
the retraction movement.
Axis couplings
Axis couplings are not restored with the selection of JOG retract.
Tapping using G63
JOG retract is not possible for tapping with compensating chuck and speed-controlled spindle
without encoder (G63).
Transformations
If a transformation is selected through JOG retract, the active measuring systems of all
machine axes involved in the transformation must be in the "referenced" or "restored" state.
OEM transformations such as parallel kinematics for hexapods, can only be traversed with
referenced measuring systems. Traversing with restored axis positions is not possible.
Tool orientation via directly programmed orientation axes
JOG retract cannot generate a retraction movement in the tool direction if the tool orientation
is not performed via NC functions, but through direct programming of the orientation axes.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA