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Have you tried combining X and Y home switches on one input, and Z and Y2 home switches on another?

1. with only one switch, forget Y2 and tandem, it does not work.
2. you can use a single switch for both Y sides, but only as a single Y axis/joint, just choose Y step and Y dir for both stepgens (1 and 2 as far as i can se in your ini)
3. LinuxCNC can do multiple switches for a single input, must be normally closed, though
4. For tandem axis/joints with separate switches on both Y you would need 2 inputs as Y and Y2 can not be on the same input, so 2 inputs for 4 or more switches.
5. point 4 above works perfectly fine as i have some machines set up like that with parallel port, and can do gantry squaring.

I have a gantry too, and the only difference I can see between my config and yours is that you don't seem to have your Y2 homing switch configured.

i forgot to mention I do not have any more input available on my g540 to add limit switch

Hi tommy, thx for quick reply.

i only have limit switch on one side of Y, i was hoping to make it work with the same switch for both sides (not being able to square machine but able to stop machine from crashing) is it possible to assign Y and Y2 to the same switch? if not what do i have to change to make it work.

thank you

RikoBR wrote:

... i got it to where machine will turn on and respond to jog, however i cannot have Y and Y2 work together i can run them individually.

From a quick glance, there is no home switch assigned for Y2, so that will not work, as you describe above is not the normal tandem axis/joint behavior, normal is : no jogging possible for tandem axis before homing.
Does the machine have a home switch on each side of the Y axis? That is a must for tandem to work and can be used to adjust the gantry at each homing of the machine (squaring the gantry).
If not, you can set both stepgens for the Y axis as normal XYZ machine, just do not choose tandem. This can not do squaring, though.

Here is my ini file

Please post your ini file.

I am very new to the system, i just bought a used CNC (with macch3) about 2 months ago and decided to upgrade to linuxcnc. i have a g540 diver and bought a mesa 7i92t. installed it and after 2 days i got it to where machine will turn on and respond to jog, however i cannot have Y and Y2 work together i can run them individually.

I have tried some stuff i found (including AI) and cant make it work i know its something simple for you guys but not to me.
and eventually i will have to figure my spindle out i have a 120v water cooled spindle with a VFD in one of my tries spindle kinda worked but now its no. any info or posts to help with that is also appreciated

I have the .hal and .ini attached if that helps figure out 

thank you in advance! 

   

Summarized Problem: Why doesn't the orientation of the spindle in the AXIS GUI reflect the actual position of the machine's spindle in space? Within the bounding box. The bounding box dimensions and size are correct. 
 
In our Linux CNC configuration when we turn on the machine and open AXIS, the GUI displays a 3D bounding box built by the min and max values given for the joints/axis in the INI file.  The GUI then puts the virtual spindle in the center of our workspace which is fine initially however our HOME position for our Bostomatic 3-axis milling machine is in the top front corner. I was expecting that when we press home all then the GUI virtual spindle will realize it is not in the correct position, however it does not, after it homes the virtual spindle is in the same position in AXIS  as when the application opened (the center). Where as our machine correctly went through the homing procedure where the soft-limit switch and home is shared and the actual spindle is now in that top front corner (which would be the top front corner of the GUI bounding box if it did what I wanted it to).  In this config the min and max values for the x, y and z axis are respectively (-9,9), (-6, 6) and (-6, 6). Which makes sense why AXIS is assuming that the origin, (the (0,0,0)) is the same at the home position.  So then I thought the solution would be to change the x, y, and z axes' mins and maxes to be: (-18, 0), (-12, 0) and (-12, 0) so that the (0, 0, 0) position is that corner where the home actually is.  This does put the virtual spindle in the right position. However this messes up the range of the axes because is assumes the position the machine is in when it is turned on IS on the edge of the bounding box and therefor won't jog in the positive direction because AXIS thinks it has no room but the machine indeed does. And therefor the GUI and the machine are still not on the same page just off in a different way.  SO, how do I get AXIS on the same page as the machine.  

I set configPDOS="false" and set debug level to 1 then started linuxcnc and did dmesg:
[ 5955.390588] EtherCAT DEBUG 0-3: Sync after 2916 ms: 10723 ns
[ 5955.391589] EtherCAT DEBUG 0-3: 9904 ns difference after 2920 ms.
[ 5955.391591] EtherCAT DEBUG 0-3: ref_time=812044903503955000
[ 5955.391592] EtherCAT DEBUG 0-3: app_time=812044909343879717
[ 5955.391593] EtherCAT DEBUG 0-3: start_time=812044909442878936
[ 5955.391594] EtherCAT DEBUG 0-3: cycle=1000000
[ 5955.391595] EtherCAT DEBUG 0-3: shift_time=0
[ 5955.391596] EtherCAT DEBUG 0-3: remainder=923936
[ 5955.391597] EtherCAT DEBUG 0-3: start=812044909442955000
[ 5955.391598] EtherCAT DEBUG 0-3: Setting DC cyclic operation start time to 812044909442955000.
[ 5955.393588] EtherCAT DEBUG 0-3: Setting DC AssignActivate to 0x0300.
[ 5955.396589] EtherCAT ERROR 0-3: Failed to set SAFEOP state, slave refused state change (PREOP + ERROR).
[ 5955.397588] EtherCAT ERROR 0-3: AL status message 0x001E: "Invalid input configuration".
[ 5955.399588] EtherCAT 0-3: Acknowledged state PREOP.

ethercat upload 0x60c2 1
0x02 2
ethercat upload 0x60c2 2
0xfffffffd -3

Don't know what this means; could you explain what interpolation time is?