Function Manual
172 01/2017
Active spindle control mode
Active spindle mode oscillation mode
Active spindle positioning mode
Tapping with compensation chuck active
Constant cutting rate active (G96)
Path feedrate F
Functionality
The feedrate F is the
of the tool along the programmed workpiece contour. The individual axis velocities
therefore result from the portion of the axis path in the overall distance to be traversed.
The feedrate F is effective for the interpolation types G1, G2, G3, CIP, and CT and is retained in a program until a new F
word is written.
SINUMERIK 808D/SINUMERIK 808D ADVANCED Programming and Operating Manual
Dimension units for F: G94, G95
The dimension unit for the F word is determined by G functions:
● G94 F as feedrate in mm/min or inch/min
● G95 F as feedrate in mm/rev of the spindle or inch/rev
(only meaningful when the spindle is running)
The inch dimension system applies with G700 or system setting "inch" with MD10240 SCALING_SYSTEM_IS_METRIC=0.
Dimension units for F with G96, G97
For
the group with G94, G95 has been extended by the G96, G97 functions for the
(ON/OFF).
These functions also influence the S word.
With activated G96 function, the spindle speed is adapted to the currently machined workpiece diameter (transverse axis)
such that a programmed cutting rate S remains constant on the tool edge (spindle speed times diameter = constant).
The S word is evaluated as the cutting rate as of the block with G96. G96 is modally effective until cancellation by another G
function of the group (G94, G95, G97).
The feedrate F is always evaluated in the unit of dimension of mm/rotation or inch/rotation (as for G95).
Maximum tool path velocity
The maximum path velocity is obtained from the maximum velocities of the relevant axes (MD32000 MAX_AX_VELO) and
their proportion of the path. The maximum velocity of an axis stored in the machine data cannot be exceeded.
CFC feedrate override for circles
When machining circular contours using milling tools and the active tool radius compensation (G41/G42), the feedrate at the
milling cutter center must be adjusted if the programmed F value is intended to be active at the circular contour. If the
feedrate override is active, inside and outside circle machining is detected automatically.
The feedrate override can be switched-off using
.
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