multi axis synchronous jog?

Hi all,

please help me, i want to make cnc spinning machine with linuxcnc, my python code to track the contours is nearly finished but i need to
jog axes in synchronous and i dont know can i make.

start 2 axis jog in realtime, when you call command.jog() in two axes not start same time.
like this:comm.jog(linuxcnc.JOG_CONTINUOUS, False, 0, xv * jfeed)
comm.jog(linuxcnc.JOG_CONTINUOUS, False, 2, zv * jfeed)

I don't understand your problem but it looks like one axis is starting sooner then the second axis in time.

Your python command's are done from a gui updating thread let's say 100ms interval. This is i think your problem.

If you want to have more freedom, try to use the stepgen component.
Then you can sent position value's with halcmd. Then in python you can code the motion profile's for your spinning machine.




 

There is no way to actually synchronize jogs of multiple axes (currently anyways)

You could probably get something very close by starting two independent jogs in realtime (as Andy, I thinking is leading to)

I guess it depends on how synchronized you need.

it would be nice to have a true multi axes jog - for chamfering on a lathe for instance.

Good idea, but how to pass multiple values realtime to hal?
I explain the full problem, i need to teach the movements by hand with joystick and cannot cross the bounding curves and move seamlessly.
tried to switch between jog (free moves) and mdi(bounding curves) mode but not working because of lag in switching modes.
I switched to full jog mode teaching,  but because of axes not start synchronized a small gap between the bounding curve and the moves.
Later I upload the code with instructions to use, but I need to go to working.

ok i solve my sync jog problem.

i made a hal component that get input of an angle then make 2 analog out from it.

component syncjog;
pin in float angle;
pin out float analog0;
pin out float analog1;

function _;
license "GPL";
;;

#include <rtapi_math.h>

const float k = 3.1415926535 / 180;

//main function
FUNCTION(_) {
analog0 = sin(angle * k);
analog1 = cos(angle * k);
}