Siemens SINUMERIK 840D Function Manual page 684

H1: Manual traversing
17.11 Circular travel in JOG
Specification of circle parameters
At least the following data is required for circular travel in JOG:
● Coordinates of the circle center point
● The maximum circle radius for internal machining or minimum circle radius for external
machining
● Machining mode (internal or external machining)
The specifications are made via the user interface in the channel-specific setting data:
SD42690 $SC_JOG_CIRCLE_CENTRE (circle center point)
SD42691 $SC_JOG_CIRCLE_RADIUS (circle radius)
SD42692 $SC_JOG_CIRCLE_MODE (jog circle mode)
For details, see Chapter "Parameter setting (Page 689)".
Activating the function
The PLC sets the interface signal after the "Circular travel in JOG" function has been selected:
DB21, ... DBX30.6 (JOG circular travel)
The NC confirms the activation with the interface signal as soon as the function is effective:
DB21, ... DBX377.6 (JOG circular travel active)
Note
Activation is not possible:
● during an NC reset
● In case of impending emergency stop
● During processing of an ASUP
● If at least one of the participating axes is already being traversed
● If PTP travel is active
● During active Cartesian manual traversing with generic transformation
No alarm message occurs. Delayed activation takes place after closure or after
acknowledgement of the active function.
Sequence
After activating the function, the tool can be traversed by means of a continuous or incremental
JOG motion using traverse keys or a handwheel:
● For a JOG movement request for the 1st geometry axis of the active plane, traversing is
done from the current position via a concentric arc with the same center point as for the
defined arc.
● For a JOG movement request for the 2nd geometry axis of the active plane, traversing is
done perpendicular to the defined arc. As a result, the circle radius changes.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA