Strange error with my X axis

Hello,

Today I did some mechanical modifications on my machine and now I am not able to go to X zero anymore. I didn't touched anything in my INI or HAL file.

When I now try to input "G0 X0" after homing, LinuxCNC tell me that this command will exceed the negative soft limit of my X axis but my axis minimal is -0.001. Even more strange, if I input "G0 X0.1", it work but if I then start moving my Y axis, it will sudently stop telling me that my X axis soft limit of -0.001 has been exceeded ...

I am getting crazy with this problem, can someone help me ? I don't see how it can be related to what I did as the axis doesn't even start moving if I try to move to zero position.

Here is the INI file for my X axis (my limit switch is at X maximum position => HOME_OFFSET) :

[AXIS_X]
MAX_VELOCITY = 25.0
MAX_ACCELERATION = 350.0
MIN_LIMIT = -0.001
MAX_LIMIT = 355.0

[JOINT_0]
TYPE = LINEAR
HOME = 345.0
MIN_LIMIT = -0.001
MAX_LIMIT = 355.0
MAX_VELOCITY = 25.0
MAX_ACCELERATION = 350.0
STEPGEN_MAXACCEL = 480.0
SCALE = 200.0
FERROR = 1
MIN_FERROR = .25
HOME_OFFSET = 355.000000
HOME_SEARCH_VEL = 5.000000
HOME_LATCH_VEL = -2.492522
HOME_IGNORE_LIMITS = YES
HOME_SEQUENCE = 1

Thank in advance.

 

check your G54x offsets and active tool offsets.

cmorley wrote:

check your G54x offsets and active tool offsets.
 

My offsets are at zero and my active tool has only a 0.1 mm offset on Z axis.

Another strange thing is also that after the X homing, instead of going to 340 like specified in the INI, it always go to 340.10.. 

You don't have a rotational offset set do you?
Do you use AXIS ? axis has a page that will show you all active offsets (you might need to select it in the drop down menu)

X changing while moving Y sounds like rotational offsets, unless you use backlash comp or leadscrew mapping.

I use Milkins to skew my XY axis !

I could have search for this for hours, thank you guys !

It now make sense, my homing position is at Y=10 and I use a skew of 0.001/mm, so LinuxCNC can't allow me to travel less than X=0.01. And if I then jog Y, I going out of the XY plane.

I wasn't aware that LinuxCNC was skewing the plane in "visible" coordinate, I thought it was something hidden behind the scene.

Now I will see if I need to adjust only JOINT min/max or also AXIS to have something more easy to use. Like allow JOINT until -1 (for motors and thus milkins) and AXIS to 0.

Thank you.

EDIT :

I confirm that it was only needed to adjust the JOINT min/max to allow -1 as min and I kept my AXIS at 0 as a minimum. It now work correctly, I can go to X0 and travel along the Y without getting out of limit.