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G-Code, CAD, and CAM discussions / G-Code G15/G16 Polar coordinate
« on: July 27, 2015, 10:07:34 AM »
Hi,
this is my first post in the cnc world at all :-)
I am building a larger 3D-printer with a horizontal X axis and a rotational Y axis (plus Z-axis) - just like a normal tower crane. I calibrated the Y-axis so that G0 Y360 yields a full turn.
I than converted the cartesion coordinates of the G-code output of the CAM program to polar coordinates and read the file into Mach3.
The geomety of my input file shows perfectly up in the mach3 toolpath window!
G90
G0x0y0
G16
G1x1y45 (e.g.)
...
G15
M30
%
But unfortunately, G1x1y45 didn't go to the 45° position. Rather, a first G1x1y1 yielded a 30° move. But any efforts to scale this, where unsuccefull. The following problems occured, but I was unable to find a reasonable reasoning behind it:
- The scaling factor is not always 1 : 30, sometimes 12° sometimes even non linear (depending on the x-value)
- Mach switched sometimes (only) the x-moves in G91 modes (incremental)
- any attempt to calibrate "motor tuning" in the G16 mode didn't work (sometimes even non linear)
Any help would be very much appreciated.
Hans
this is my first post in the cnc world at all :-)
I am building a larger 3D-printer with a horizontal X axis and a rotational Y axis (plus Z-axis) - just like a normal tower crane. I calibrated the Y-axis so that G0 Y360 yields a full turn.
I than converted the cartesion coordinates of the G-code output of the CAM program to polar coordinates and read the file into Mach3.
The geomety of my input file shows perfectly up in the mach3 toolpath window!
G90
G0x0y0
G16
G1x1y45 (e.g.)
...
G15
M30
%
But unfortunately, G1x1y45 didn't go to the 45° position. Rather, a first G1x1y1 yielded a 30° move. But any efforts to scale this, where unsuccefull. The following problems occured, but I was unable to find a reasonable reasoning behind it:
- The scaling factor is not always 1 : 30, sometimes 12° sometimes even non linear (depending on the x-value)
- Mach switched sometimes (only) the x-moves in G91 modes (incremental)
- any attempt to calibrate "motor tuning" in the G16 mode didn't work (sometimes even non linear)
Any help would be very much appreciated.
Hans