● Current tool radius=10, and so the effective compensation radius for TRC=15, the radius of
the SAR contour =25, with the result that the radius of the tool center path is equal to
DISR=10
● The end point of the circle is obtained from N30, since only the Z position is programmed in
N20
● Infeed movement
– From Z20 to Z7 (DISCL=AC(7)) with rapid traverse.
– Then to Z0 with FAD=200.
– Approach circle in X-Y-plane and following blocks with F1500 (for this velocity to take
effect in the following blocks, the active G0 in N30 must be overwritten with G1, otherwise
the contour would be machined further with G0).
● Smooth retraction (block N60 activated)
● Retraction with quadrant (G248) and helix (G340)
● FAD not programmed, since irrelevant for G340
● Z=2 in the starting point; Z=8 in the end point, since DISCL=6
● When DISR=5, the radius of the SAR contour=20, the radius of the tool center point path=5
Retraction movements from Z8 to Z20 and the movement parallel to the X-Y plane to X70 Y0.
Program code Comment
$TC_DP1[1,1]=120 ;Tool definition T1/D1
$TC_DP6[1,1]=10 ; Radius
N10 G0 X0 Y0 Z20 G64 D1 T1 OFFN=5 ; (P0 app)
N20 G41 G247 G341 Z0 DISCL=AC(7) DISR=10 F1500 FAD=200 ; Approach (P3 app)
N30 G1 X30 Y-10 ; (P4 app)
N40 X40 Z2
N50 X50 ; (P4 ret)
N60 G248 G340 X70 Y0 Z20 DISCL=6 DISR=5 G40 F10000 ; Retraction (P3 ret)
N70 X80 Y0 ; (P0 ret)
N80 M30
Further information
Selecting the approach and retraction contour
The approach and retraction contour are selected with the appropriate G command from the
2nd G group:
G147: Approach with a straight line
G247: Approach with a quadrant
G347: Approach with a semicircle
G148: Retraction with a straight line
G248: Retraction with a quadrant
G348: Retraction with a semicircle
Fundamentals
2.10 Tool radius compensation
NC programming
274 Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
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