Siemens SINUMERIK 840DE

Feedrate Control and Spindle Motion
7.9 Feedrate with handwheel override (FD, FDA)
Fundamentals
7-26 Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Parameters
OVR Feedrate change in percent for path feedrate F
OVRA Feedrate change in percent for positioning feedrate FA
or for spindle speed S
SPI Converts the spindle number into an axis identifier; the
transfer parameter must contain a valid spindle number.
The spindle identifiers SPI(...) and S... are identical
in terms of function.
Axis Positioning axes or geometry axes
Value range …200%, integers; with path and rapid traverse override,
the maximum velocities set in the machine data are not
exceeded.
Programmed feedrate change
The programmed feedrate change refers to or is combined with the feedrate override set on
the machine control panel.
Example:
Set feedrate override 80%
Programmed feedrate override OVR=50
The programmed path feedrate F1000 is changed to F400 (1000 * 0.8 * 0.5).
Example
N10 OVR=25 OVRA[A1]=70 ;Path feedrate 25%, Positioning feedrate for A1 70%.
N20 OVRA[SPI(1)]=35 ;Speed for spindle 1 35%.
Or
N20 OVRA[S1]=35
7.9 Feedrate with handwheel override (FD, FDA)
Function
With these functions, you can use the handwheel to traverse path and positioning axes
(position parameter) or change the axis velocities (speed override) during program
execution. The handwheel override is frequently used for grinding operations.
Notice
Only speed override can be used for path axes. The path feedrate F and the handwheel
override FD may not be programmed in the same NC block.