0M Cutter comp

I have a Daewoo VMC with a Fanuc 0M control. The only way I can get the cutter comp to work properly (not crashing) is to use G1 G3 G41 in the same block. I have never seen G1 and G3 in the same block on other machines. My post for my programming software will not generate a program with a G1 and G3 in the same block, so all I can do is program manually at the machine. There were some old programs in memory when I got the machine, that is how I found out how it has been working. Any help or ideas would be much appreciated. Thank you

Quote:

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Originally Posted by millguy63

I have a Daewoo VMC with a Fanuc 0M control. The only way I can get the cutter comp to work properly (not crashing) is to use G1 G3 G41 in the same block. I have never seen G1 and G3 in the same block on other machines. My post for my programming software will not generate a program with a G1 and G3 in the same block, so all I can do is program manually at the machine. There were some old programs in memory when I got the machine, that is how I found out how it has been working. Any help or ideas would be much appreciated. Thank you

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G1 and G3 cancel each other out. You should only activate G41 or G42 in G00 or G01 mode. Same for cancelling with G40.

Why not post your program here so we can see what might be causing the problem.

This is a simple tool path I copied and pasted. G1 G3 and G41 are in the same block. If I delete the G3 it will not turn the cutter comp on. If I delete the G1 it will make an arc movement but still not comp properly.

N2T27M98P8
( TOOL 27- .187 FINISH ENDMILL )
G17G80G40
G56
S1833M3
G90G0X.1448Y-.062
G43Z5.H27
M8
Z.1
G1Z-.125F5.5
G1G3G41Y.125D57
G1X-.875
G3Y-.125J-.125
G1X.1419
G40Y.062
G0Z5.
M9
G91G28Z0.
M5
M30

Most CNC machines will not allow you to start cutter compensation on an arc move. Must be done on a linear move. Same with cancelling.

Quote:

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Originally Posted by millguy63

This is a simple tool path I copied and pasted. G1 G3 and G41 are in the same block. If I delete the G3 it will not turn the cutter comp on. If I delete the G1 it will make an arc movement but still not comp properly.

N2T27M98P8
( TOOL 27- .187 FINISH ENDMILL )
G17G80G40
G56
S1833M3
G90G0X.1448Y-.062
G43Z5.H27
M8
Z.1
G1Z-.125F5.5
G1G3G41Y.125D57 <----------- removed G3 and it backplotted fine.
G1X-.875
G3Y-.125J-.125
G1X.1419
G40Y.062
G0Z5.
M9
G91G28Z0.
M5
M30

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With the G3 in the G41 block it backplots ugly. Removing the G3 solved the problem. What value do you have in D57?

Hmmmmm. millguy63 musta taken off on holiday or somethin'. Hope he got his problem figured out.