Radius to end of Arc Differs From Radius to Startline

[Bob La Londe]

Radius to end of Arc Differs From Radius to Startline

Ok... Why? I mean I used this G-code file to cut an actual work piece under my previous profile. However under the Gecko XML I get this error.

What setting would be different that the code would be good in one, but not the other?

I reloaded my old profile and loaded the same g-code file just to make sure and it did not stop at this as an error.

Except for having to reverse the X motor direction and increase the kernal to 45000 my XML is exactly the same and the one on the Gecko website. 

[ger21]

Probably a different IJ mode.

[Bob La Londe]

Not caring if I sound stupid, but where do I check/set the IJ mode in the XML or settings of Mach 3?  

Sure glad I didn't delete my old profile when I got the Gecko profile working. 

[RICH]

Go to the Config>General config and in the middle of the page you have the option of ij mode / absolute or incremental.
Remember to save the settings.

RICH

[ger21]

In General Config.

It's a good idea to have your g-code set it.

G90.1 is absolute IJ
G91.1 is incremental IJ

Put the correct one at the start of your code.

[Christy]

I've been getting the same error also.  This is coming up on programs that have been used with no problems and new programs using exactly the same software.  I can use point to point and all is good, but arcs will not go at all.  They will cut, but all wrong.  I've tried making sure G20 is on and deleting the G54 that I'd read about.  No luck.  I've also reformatted thecomputer and reinstalled the Mach 3 that has always worked before.  Again no luck.  HELP PLEASE!

[Hood]

It is likely the IJ mode and  not the offset (G54) or whether  Imperial or Metric (G20/G21).
Type G91.1 into MDI and press keyboards enter and then regenerate the toolpath, if that doesnt work MDI G90.1

Hood

[rrc1962]

Whenever that error has popped up it was always a G-Code error.  If I recall, it was a missing G2 or G3 word following a G0 or G1 move.  It's only happened a few times in 10 years and probably after I had been monkeying with the post.

[Christy]

Thanks,  I added the G91.1 And now it is working again.  Christy

[Hood]

Good to hear
If you just MDI'd the G91.1 then it would be best to add it to the start of your code so that if it gets changed by some other code it will change it automatically when you run the next code.
Hood