Automatic Corner Override G62; Cutting Feedrate Control - Siemens SINUMERIK 802D sl Programming Manual

Movement Control Commands

3.4 Cutting feedrate control

3.4 Cutting feedrate control
3.4.1

Automatic corner override G62

It is often better to reduce the feedrate at inside corners with active tool radius
compensation.
G62 is operative only at inside corners with active tool radius compensation and
active continuous--path mode. Any corner whose inside angle is higher than the
setting in $SC_CORNER_SLOWDOWN_CRIT is ignored. The inside angle is de-
termined by the bend in the contour.
The feedrate is reduced by the factor $SC_CORNER_SLOWDOWN_OVR:
Applied feedrate = F * $SC_CORNER_SLOWDOWN_OVR * feedrate override.
The feedrate override is the product of the feedrate override from the machine con-
trol panel multiplied by the override from synchronized actions.
The feedrate reduction starts at a distance of $SC_CORNER_SLOW-
DOWN_START before the corner. It ends at a distance of $SC_CORNER_SLOW-
DOWN_END after the corner (see Fig. 3-16 ). An appropriate path is traveled on
curved contours.
y
Tool center point path
Tool path velocity v
F
F * $SC_CORNER_SLOWDOWN_OVR
Fig. 3-16
3-68
Layer to be milled off
$SC_CORNER_SLOWDOWN_START
$SC_CORNER_SLOWDOWN_END
Inside angle ± $SC_CORNER_SLOWDOWN_CRIT
$SC_CORNER_SLOWDOWN_START
$SC_CORNER_SLOWDOWN_END
Parameterization of feedrate reduction G62 illustrated by example of a 90_ corner
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) - - 04.07 Edition
Workpiece
Feedrate reduction at corner
Path s
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04.07
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