Siemens SINUMERIK 840D sl Function Manual page 81

The following conditions must be met:
● The radius of a new tool (R2) must not exceed the radius of the original tool (R1) by the factor
2:
R2 < 2 * R1
● The slot must have an odd number of blocks.
● The central block must comprise a straight line.
● The radius of the rounding at the start of the slot or the length of the block preceding the slot
must not be less than the difference R2 - R1.
Activation
To activate the function "slot shape recognition", the following channel-specific setting data
must be set to "1":
SD42977 $SC_SLOT_FORM_RECOGN = 1
Parameterization
Number of blocks for predictive feature recognition
The slot shape recognition is only active if the following channel-specific machine data is set to
a value greater than zero:
MD28620 $MC_MM_NUM_FEATURE_BLOCKS > 0
With MD28620, the minimum number of blocks is defined that are considered at any one time
in order to detect the slot shape.
Recommended value: 15 (This corresponds to the number of contour elements for a T-slot with
an arc between the straight lines.)
Example
In the following part program section, a deflection line is programmed that will be cut with a laser
beam.
Program code
N1 G01 G90 G71 F10000
N2 $TC_DP1[1,1] = 120
N3 $TC_DP3[1,1] = 0.0
N4 $TC_DP6[1,1] = 0.2
N6 G91 G41 G01 T=1 D=1
N7 X100.00
N8 Y-24.500
N9 G02 X-0.200 Y-0.200 I-0.200
N10 G01 X-49.700
N11 G03 X-0.100 Y-0.100 J-0.100
N12 G01 Y-0.100
Tools
Function Manual, 06/2019, A5E47435126B AA
2.5 2D tool radius compensation
Comment
; Tool radius = 0.2 mm
; Activate TRC.
; Rounding at the start of the deflec-
tion line contour.
W1: Tool offset
81