Gcode dinamic position error

Hallo

I'm new user,
I have 2.5.1 version and I use axis gui. I have only one stepper axes for my first test with linuxcnc. It's all ok but I have a strange problem ...
If I write:

the axes go to approximately 70% of measure then reverse the mouvement and go to approximately -70% of mesure and reverse again .... on until the end. But if I write in this way the code:

the motion is perfect!!! :dry:

does anyone know the problem?

Try adding G64 Pn to your code first, to avoid "blending" of the moves.

linuxcnc.org/docs/devel/html/gcode/gcode.html#sec:G64

Rick G

You should always have a preamble line to set the working conditions expected. If you just accept what is currently active in the modal groups you may get surprised from time to time. A short tutorial on preamble is here . In your case I would just use G61 in the preamble.

John

gfx1 wrote: the axes go to approximately 70% of measure then reverse the mouvement and go to approximately -70% of mesure and reverse again

As well as the other comments about the motion-blending mode, I think this shows that your axis acceleration values are much too low. The effect of blending should not be quite this obvious.

Thank you to all ..... I solve with g64 p0.005 and g61 :lol:

the Gcode is new for me!!

Glad to hear you have it sorted out!

Rick G