fixer wrote: Yannis, I belive that I know what you want to achieve. You want to manually rotate your saw (C axis), then you would like to move the X-Y in line with the angle the saw is pointing to. All this manually, without programming. This is possible with some custom hal component logic.
There are other (possibly easier) ways to do this too.
Take a look at the G10 commands:
linuxcnc.org/docs/2.7/html/gcode/g-code.html#gcode:g10-l2
That allows you to rotate the XY coordinate system around the Z axis.
So, a hardware button that runs an
MDI_COMMAND
could be set up that runs G10 L2 R[something] would mean that a G1 F100 X2000 (on a second button maybe) would follow the current line of the saw
You could do a similar thing with polar coordinates, but you still need the G10 L20 X0 Y0 to make the current position the centre of the polar coordinate system.
In fact there are three things to do on the button-press so making the MDI_COMMAND button call a G-code subroutine is probably the way to go.
You might need some mathematics in the subroutine to calculate exactly how far the saw can run (then making that request will not cause a "move exceeds limits" warning.
