[3.6.0-rc.2] changed behaviour while homing on coreXY

marvineer

Hi folks, today I updated to 3.6-rc2.

Everything was working fine until I tried to home the machine.
Then I noticed that when homing to y, the tool head moves diagonally instead of just moving to the y end stop. I had a surprised face and lets say I am grateful for the HW estop

Its an e3d tool changer (coreXY) and I have the following file homey.g (minimal example) that worked as I intended it in 3.5.4:

; homey.g
; called to home the Y axis

G91					; relative positioning
M400					; make sure everything has stopped before we change the motor currents
M913 X20 Y20				; drop motor currents to 20%
G1 H2 X2 F1800				; move x so that the endstop is free to pass
G1 H1 Y-282 F1800			; move quickly to Y axis endstop and stop there (first pass)
G1 Y2 F1000				; go back a few mm
G1 H1 Y-5 F300				; move slowly to Y axis endstop once more (second pass)

G90               			; absolute positioning

M400 						; make sure everything has stopped before we reset the motor currents
M913 X100 Y100 				; motor currents back to 100%

So, the problem I found lighs in line 7: There I want to make shure to leave room for the X endstop to pass.
This moves the toolhead out of way enough. After that the homing sequence for y begins.

the homing move in line 8:
3.5.4: moves straight to the y endstop, the machine moves only in y
3.6-rc.2: moves diagonally towards y and x endstop

When i comment out line 7 ;G1 H2 X2 F1800 the homing sequence for y is performed now, but of course there is possibly not enough room to pass the x endstop while doing so.

Was there a change in behaviour since 3.5.4 that didnt make it into the release notes or did I miss something? Or is this unintended behaviour?
Thanks in advance!

jay_s_uk

@marvineer G1 H2 on a coreXY setup will only move a single motor. That's intended.
I'm also pretty sure this has been this behaviour for ages so what you're describing for 3.6 is correct behaviour

marvineer

@jay_s_uk Yep, maybe I was not clear in my first post:

The point is: line 8 behavs differently depending if line 7 is commented out or not.
Thats where the sense stops making sense to me

This is the difference in behaviour for me:

In fact, this returns the old, intended behaviour:

G1 H2 X2 F1800				; move x so that the endstop is free to pass
M400
G1 H1 Y-282 F1800			; move quickly to Y axis endstop and stop there (first pass)