Export contour in gcode

[AdyV94]

I want to export a contour to gcode, with I and J in absolute coordinates. And I don't succeed Can someone explain to me how to do it? I also leave an example of how I would need gcode (test-Sketch.nc) generated with dxf2gcode.

[Kunda1]

Moved to the Path/CAM subforum

Path_Walkthrough_for_the_Impatient

[chrisb]

I want to export a contour to gcode, with I and J in absolute coordinates. And I don't succeed Can someone explain to me how to do it? I also leave an example of how I would need gcode (test-Sketch.nc) generated with dxf2gcode.

The predecessor of the philips postprocessor could create such paths, using 'K' parameter instead of 'J'. It isn't well maintained, I just commented some lines out which lead to an error, but it may be a basis for what you need. It had lots of parameters which then could not be set as arguments, but had to be changed at the top of the file.

Important are here
USE_RADIUS_IF_POSSIBLE which I have set to False and possibly
ABSOLUTE_CIRCLE_CENTER, which I have set to true.

The output resembles what you expect (header removed manually):

Code: Select all

N7 G54 
N8 G0 Y6.000 
N9 (TC: Default Tool) 
N10 M66 T1 
N11 ()
N12 (Engrave) 
N13 G0    
N14       
N15 X-39.718 Z24.318    
N16 Y4.000    
N17 G1       Y-5.000    
N18 X25.815 Z32.123       
N19 X52.204 Z0.761       
N20 G3 X20.083 Z-43.440    R28.146    
N21 G1 X-39.617 Z-19.211       
N22    Z24.318       
N23 G0 Y6.000 
N24 M30

[sliptonic]

Sorry. I made an error as moderator and edited the first post instead of replying with quote.
I reverted what I could but may have lost part of the original post.

I was trying to ask OP about the reason for wanting absolute arc centers. To my knowledge, the request hasn't come up before and I don't see an advantage. I'm just curious about the use-case.

[dtay]

Hi,

It makes comparing g-code to a blueprint less painful. Sinumerik example:

ABS_ARC_CENTER.JPG (57.45 KiB) Viewed 1090 times

[AdyV94]

Sorry. I made an error as moderator and edited the first post instead of replying with quote.
I reverted what I could but may have lost part of the original post.

I was trying to ask OP about the reason for wanting absolute arc centers. To my knowledge, the request hasn't come up before and I don't see an advantage. I'm just curious about the use-case.

It is a Wire EDM from 1996 and it doesn't know much relative coordinates, the whole program goes on absolute coordinates, at x and y it knows some relative coordinates but it automatically converts them to absolute. For i and j it's a hassle, only absolute coordinates work. So basically I would just need an outline with absolute coordinates including i and j.