Millright Mega V Controller Change

I recently purchased a Millright Mega V XL and the GRBL controller that comes with it drops out consistently during jobs so I swapped out the controller with a Mesa 7i96 and I'm trying to use LinuxCNC to control the 7i96 board. I initially used the Pncconf tool to generate the configuration for LinuxCNC. This machine has limit switches installed for the X, Y, and Z axes'. I've been able to get to the point where the machine is now jogging on all axes'. The problem is when I attempt to home the machine in any axis. When I try this I get the errors: "hit limit switch in home state 7" followed by "Joint 0 on limit switch error".

I've tried everything I can think including tracing the logic through the control.c and homing.c (software engineer) and I can't figure out why these errors are being generated.

I've attached my latest ini and hal files.

Any help is greatly appreciated!

--
Evan

if you have a combined home/limit switch on a joint you need to have

HOME_IGNORE_LIMITS = YES

on that joint

linuxcnc.org/docs/html/config/ini-homing.html

If I use that setting on that joint and try to home that axis it just crashes into the side of the machine ignoring the limit switch.

Is there another setting that I need in order to use that limit switch?

I suspect you didn't tell pncconf that you have shared home/limit switches
(so LinuxCNCs joint home inputs are unconnected in the hal file)

That is:

net x-home-sw => joint.0.home-sw-in
net min-x => joint.0.neg-lim-sw-in

would need to change to

# net x-home-sw => joint.0.home-sw-in
net min-x => joint.0.neg-lim-sw-in joint.0.home-sw-in

etc

With these changes my machine is finally homing correctly!

I just have to figure out how to reverse the direction of the Y axis according to LinuxCNC and it might actually be working!

emoseman wrote:

With these changes my machine is finally homing correctly!

I just have to figure out how to reverse the direction of the Y axis according to LinuxCNC and it might actually be working!

Have you tried changing STEP_SCALE = -57.288 to 57.228 that should change the motor direction.

But then you would need to change the signs on the homing so they move in the correct direction

I would try to swap two wires between y motor and y driver. That way you do not have to remember those "inversions" over coming years. Or write good documentation in your hal file.
m5c
Mike

This is what I ended up having to do to get the Y axis moving in the right direction.

Thanks for the tip!