Help with tandem axis Y

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! 

   

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

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

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.

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

that never cross my mind, did not think that was possible and then i  can just assign limit switches on pncconfig? i can sure try that. is that how you have yours?

No, I have a 7i76e with lots of inputs. I used to have a machine run off a parallel port, though, which has very few inputs.

tommylight wrote:

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.

Is that what you meant Tommy? use my limit switch from Z with Y and limit switch from X with Y2?