Height map does not match home position

Jered

@dc42
I will move my home switches.

Thanks for your help

droftarts

@Jered you don’t need to move the switches. You can home y to the axis maximum, rather than the minimum.

Ian

Phaedrux

See my post above. I describe what to change.

also see this guide for corexy setup and testing.

https://docs.duet3d.com/en/User_manual/Machine_configuration/Configuration_coreXY

Jered

@Phaedrux
Ok, I will have a closer look.

droftarts

@Jered There's also a description of a homing file for maximum end endstop here: https://docs.duet3d.com/User_manual/Machine_configuration/Configuration_cartesian#homing-files
See M574 for information on setting an endstop to the high end.

Ian

Phaedrux

One thing that would be different in my post based on what I see from your photo is that you have the switches at left and back, that would be X min, Y max. Which would be this in the config

; Endstops
M574 X1 S1 P"io0.in"                                                                   
M574 Y2 S1 P"io1.in"

Then in your homing files the X movement would be negative, and the Y movement positive.

-X moves should go to the left, +X moves to the right
-Y moves to the front, Y moves to the back

That way the homing switches stay in the same place, but your 0,0 point becomes the front left.

That corexy guide I linked has a section on testing the motor movement to make sure things are going in the correct direction.

Jered

@Phaedrux
I have another question. Do you think this could also be messing with my G32 command. I have the ratrig with true bed leveling.

Phaedrux

Yes if the coordinate system is incorrect things may not behave how you'd expect.

Jered

@Phaedrux

I think I have this fixed now. I just want to make sure that the G32 comand is correct.

When this command is issued, my machine drives to the z leadscrew which is at the front right, then to the middle back, then to the front left leadscrew. Is my bed.g in the correct order?

Seems like it should starting at the closest z leadscrew to 0,0 then moving in order from there.

In other words, should P0 be closest to the 0,0 point?

Attached is my bed.g

bed.g

At least this can be fixed easily if it is an issue.

Phaedrux

See here: https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_auto_levelling

The order it probes them in bed.g is irrelevant but the order of the positions in the M671 command must match the order of the axis in M584.

You must use the M671 command to define the X and Y coordinates of the leadscrews. The M671 command must come after the M584 command and must specify the same number of X and Y coordinates as the number of motors assigned to the Z axis in the M584 command; and these coordinates must be in the same order as the driver numbers of the associated motors in the M584 command. The M671 command must also come after any M667 or M669 command.

Jered

@Phaedrux

Thank for your help guys! I think this is all sorted out. Everything seems to match now.