Siemens SINUMERIK 840D sl Programming Manual page 142

Feed control
7.8 Feedrate with handwheel override (FD, FDA)
Significance
FD=<velocity>:
FDA[<axis>]=<velocity>:
<axis>:
Note
FD and FDA are non-modal.
Example
Further information
Traverse path axes with velocity override (FD=<velocity>)
The following conditions must be met for the part program block in which path velocity
override is programmed:
• Path command G1, G2 or G3 active
• Exact stop G60 active
• Linear feedrate G94 active
142
Path feedrate and enabling of velocity override
with handwheel
<velocity>:
• Value = 0: Not allowed!
• Value ≠ 0: Path velocity
Axial feedrate
<velocity>:
• Value = 0: Path default with handwheel
• Value ≠ 0: Axial velocity
Axis identifier of positioning axis
Path definition: The grinding wheel
oscillating in the Z direction is traversed to
the workpiece in the X direction with the
handwheel.
The operator can continue to feed manually
until the sparks are flying uniformly.
Activating "Delete distance-to-go" switches
to the next NC block and machining
continues in AUTOMATIC mode.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals