Squaring a dual Y Axis CNC

[Storm]

Hi,
I have a CNC that isn't cutting square which I think started when I switched to dual Y axis end stops.
I presume they are not quite level despite both being pushed to the front of the machine as far forward as they can be.
Is there a way to account for the offset in GCode or will I physically have to keep moving one of the endstops before I get it right?
I see there is an M666 command to adjust an endstops offset but this seems to be for Delta machines.

[jay_s_uk]

You need to split the axis during homing, apply the offset and then rejoin them.
There's no M666 for normal endstops currently

[Nightowl]

I'm not sure if what I'm doing resolves your issue, but I use dual Y axis end stops I've configured them like this:

; Endstops
M574 X2 S1 P"io8.in"          	; configure switch-type (e.g. microswitch) endstop for high end on X via pin io8.in
M574 Y2 S1 P"io6.in+io5.in"	; configure switch-type (e.g. microswitch) and dual self-squaring high ends on Y1 via pin io6.in and on Y2 via pin io5.in
M574 Z2 S1 P"io2.in"          	; configure switch-type (e.g. microswitch) endstop for high end on Z via pin io2.in

I know it works because, when the machine was powered down, I accidentally moved one of the Y axes. When I then homed it, the machine realigned the Y axes and it's square again.

I hope this helps.

[deckingman]

@storm If you have multiple motors, and if you have multiple end stops (one per motor) and if you use RRF 3, then you can do it using M574.

[jay_s_uk]

@deckingman you can't apply an offset if the endstops aren't in exactly the same place. only way is back to old school RRF2 methods and split the axis into Y and U

[deckingman]

@jay_s_uk said in Squaring a dual Y Axis CNC:

@deckingman you can't apply an offset if the endstops aren't in exactly the same place. only way is back to old school RRF2 methods and split the axis into Y and U

Ah yes - I've should have read the OP's first post properly. My bad.

[Storm]

@jay_s_uk Thanks for this. I tagged it on the the end of my Y Homing and it works great.

[Storm]

Here's the code I used if anyone comes across this post in the future

M584 Y1 U2 P4 ;Separate Y Axis into Y&U and show U axis on UI
M564 S0 H0 ;Allow movement without homing as U axis not homed
G1 U2 ;Move right hand side of Y axis 2mm from endstop
M564 S1 H1 ;Enforce axis minimums and maximums and only allow movement after homing
M584 Y1:2 P3 ;Rejoin Y axis and hide U from UI