GSK980MDc Milling CNC System User Manual
170
I Programming
same points” and “the last two same points”
z
The alarm and corresponding explanation of ‘Circular arc data error in cutter compensation C’
(a) The example of this alarm may occur in a circle
Program example
:
N0 G90 G00 X-50 Y-50 Z50
N1 G01 G42 X0 Y0 D1 F800
N2 G02 I50
N3 G91 G01 X-50 Y-50
Programmed path
Tool center path
r
G42
N1
N2
N3
P2
P1
The transit point between straight line N1 and circular arc N2 is P1, the transit point between circular
N2 and straight line N3 is P2, and the compensation radius is r, in this case, the circular after tool
compensation is more than 360
°.
Programmed path
Tool center path
The path after N9 block is inserted
r
r
G42
N1
N2
N3
P2
P1
The path after N9 block is not inserted
After a block (N9 G91 G0 X0 Y0) (without moving) is inserted between N1 and N2 in the
above-mentioned program, the “circular data error in cutter compensation C” may alarm.
Because the point after N9 inserted which is equal to the one of N1, namely, they are regarded as “two
same points”. The transit point P1 is performed treating the “two same points”, the position of P1 is
obviously differ from the above one which does not insert the N9 block. So the cut circular arc path by this
transit point is absolutely differing from the path to be machined, so the alarm is then generated: “circular
arc data error in cutter compensation C”
(b) The example for a non-circle may occur:
Programmed path
Tool center path
r
N2
N0
N1
P1
P2
Program example: N0 G90 G00 X-50 Y-50 Z50
N1 G01 G41 X0 Y0 D1 F800
N2
G02
X50
R25
The P1 and P2 are the transit point of tool compensation as the left figure shown, wherein the “r” is
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