Y-Gantry problems to setup

Hello there,

i write here because im really frustrated. I were building a millingmachine over the last months and now im setting up LinuxCNC.

The last 2 days i tried to configure my second Y Axis. But I dont get the Config to work. (Im a complete LinuxCNC newbe)

Im using a China Bob and if i setup my machine as XYZ with the stepconf everything works fine. All and the correct motors are running but only 3 motors.

But when i try to add the second Y motor, LinuxCNC doesnt work like i want it to work. I post my ini and hal file.

Im following this guide:  forum.linuxcnc.org/49-basic-configuratio...s-on-one-axis-gantry but i cant follow everything. Per example i have axis in my ini file under [TRAJ].

I tried so much. I must say, im really confused right now. Maybe some sleep will help

At this moment:

X-Motor turns right in Jogging
Y1 Motor also runs right when I Jog Y
but instead of Z my Y2 motor turns and my Z motor never turns.


I would be so happy if someone could help me to get my machine running.


Thank you very much and good night! 

I think you have these wrong.
Axis and Joint 0 is X so..... HOME_SEQUENCE= 1
Axis and Joint 1 is Y1 So.....  HOME_SEQUENCE= -2
Axis and Joint 2 is Y2  So'''   HOME_SEQUENCE= -2

Axis & Joint 3 is Z so  HOME_SEQUENCE= 0

for a start change to above

Also
AXES=3
not 4, there are 4 joints but 3 axes.

tommylight wrote:

Also
AXES=3
not 4, there are 4 joints but 3 axes.
 

Well spotted

I think i found my problem....

I got 2.7.15 installed instead of 2.8...

Onig01 wrote:

I think i found my problem....

I got 2.7.15 installed instead of 2.8...

Yes you need 2.8.. for gantry homing but the above still applies

Im just makeing a new stick to install 2.8.2 new.

Will write if i was lucky.


Thank you so much for answering so fast! 

Hello togheter,

now i installed 2.8.2 and it seems like my configuration is working now.

But i have a problem with my home-signals.

I want to share pin inputs because i dont have much on the bob.

I tought to use:
Pin10 for y2 and x
Pin11 for z, y1 and my tool probe over traveling
Pin12 my tool probe

I understand, that i have to link the pin signal to a variable and then the variable to my net min-home.

I also tried something but i have a type missmatch. bit and float. I dont think i can do a typecast in linuxcnc?

Actually I try to link z and y1 signal so i could reference my z axis. (step by step i think if i can manage that the other 2 axis should be almost copy paste)


Maybe someone could look at my hal file and help me a bit?

mnux2 expects a float and you are using a bit.You can use conv_u32_float on the inputs but you  would also need to convert the outout back to a bit as well using conv_float_u32

Rather than use mux2 and lots of float conversions, use mux_generic and configure as bit-type in and out.