G02 G03 in MDI EMC2

[welderfabrod]

Hi Guy's trying to cut an arc in EMC2 MDI without much luck.
I just need a arc that runs into a bore to create a bellmouth for the intake for a small jet engine sound simple enough. But for some reason not so.

My Lathe is in Radius mode.
The bore is 38.9mm. dia. the arc has a radius of 11.800mm. The arc starts at X27.535 Z0 which is where I position the cutter before commanding the G03 and ends at X19.450 Z-11.200 so my centre offsets are X3.715 Z-11.200

So My Gcode is G03 X19.450 Z-11.200 I3.715 J-11.200
What I get is the error Start=(X27.535 Y0.000), Centre=(X31.25 Y-11.200), End=(X19.450 Y0.000) r1=11.8001 r2=16.269

First thing is why does the error show Y instead Z when I'm in lathe mode.
Second whats wrong with my Gcode.

I tried to put this on the EMC2 forum but kept getting error in email message.

Any ideas Thanks Rod

[welderfabrod]

Nobody have any ideas of this problem.

Rod

[Torsten]

Originally Posted by welderfabrod Hi Guy's trying to cut an arc in EMC2 MDI without much luck. I just need a arc that runs into a bore to create a bellmouth for the intake for a small jet engine sound simple enough. But for some reason not so. My Lathe is in Radius mode. The bore is 38.9mm. dia. the arc has a radius of 11.800mm. The arc starts at X27.535 Z0 which is where I position the cutter before commanding the G03 and ends at X19.450 Z-11.200 so my centre offsets are X3.715 Z-11.200 So My Gcode is G03 X19.450 Z-11.200 I3.715 J-11.200 What I get is the error Start=(X27.535 Y0.000), Centre=(X31.25 Y-11.200), End=(X19.450 Y0.000) r1=11.8001 r2=16.269 First thing is why does the error show Y instead Z when I'm in lathe mode. Second whats wrong with my Gcode. I tried to put this on the EMC2 forum but kept getting error in email message. Any ideas Thanks Rod

Try this
G01 X27.535 Z0.
G18 G03 X19.45 Z-11.2 I3.715 K-11.2

[welderfabrod]

Thanks Torsten I posted this on the EMC2 forum as well I got the same answer from John. But why should a G18 be needed when I'm set up in lathe mode and therefore surely always in G18. John also struggled with this for a while apparently. This can be very confusing. Perhaps its just a legacy thing as I believe EMC2 was inteneded for mills when it was originaly writen.

I'm going to try the G18 today.

Thanks Rod

[welderfabrod]

Thanks torsten worked fine just put the J in out of habbit from the mill, bit dumb I gues. but I hadn't realised I needed the G18 if I was in lathe Mode.
So thanks for that.

Rod