Strange X and Y homing (axis that shouldn't move, move)

MJCT

Hi, having a problem with the X and Y homing.
First the code:
; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"AA 300x300x600" ; set printer name

M667 S1 ; select CoreXY mode

; Network
M551 P"AA" ; set password
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z4000.00 E92.60 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X1750 Y1750 Z1750 E1750 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y15 Z0 S1 ; set axis minima
M208 X290 Y295 Z585 S0 ; set axis maxima

; Endstops
M574 X1 Y1 S0 ; set active low and disabled endstops
M574 Z1 S2 ; set endstops controlled by probe

; Z-Probe
M307 H4 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch
M558 P9 H0.5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X25 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X20:270 Y20:275 S20 ; define mesh grid

; Heaters
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S110 ; set temperature limit for heater 0 to 110C
M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M106 P0 S0 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Tools
M563 P0 S"Extr 1" D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

; Miscellaneous
T0 ; select first tool

Problem, when X axis is going back a few mm, the Y axis also moves slightly in the positive direction and it shouldn’t, there is nothing in the code telling y axis to move!
Homing the Y axis is even weirder. It homes the first time but it doesn’t move back for a second passage, besides that, when it hits the Y endstop the X axis moves a little bit to the positive direction.
But when I use the dashboard to move the axis they move as expected, only in the reight direction and only the specified axis.

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
G91 ; relative positioning
G1 H2 Z0.5 F6000 ; lift Z relative to current position
G1 H1 X-295 F1800 ; move quickly to X axis endstop and stop there (first pass)
G1 H2 X5 F6000 ; go back a few mm
G1 H1 X-295 F360 ; move slowly to X axis endstop once more (second pass)
G1 H2 Z-0.5 F6000 ; lower Z again
G90 ; absolute positioning

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
G91 ; relative positioning
G1 H2 Z0.5 F6000 ; lift Z relative to current position
G1 H1 Y-315 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 H2 Y5 F6000 ; go back a few mm
G1 H1 Y-315 F360 ; move slowly to Y axis endstop once more (second pass)
G1 H2 Z-0.5 F6000 ; lower Z again
G90 ; absolute positioning

Thanks

Veti

@MJCT said in Strange X and Y homing (axis that shouldn't move, move):

G1 H2 X5 F6000 ; go back a few mm

the H2 option is not compatible with corexy. delete the h2 part

Phaedrux

H2 is fine for the Z axis, but for the X and Y axis it's telling it to turn a single motor, which results in diagonal movement on coreXY.

You don't need H2 on those X and Y moves anyway since it's been homed once already. The movement to backoff the endstop can be done as normal.

Veti

the configurator generates this at the moment. so this should be changed. @chrishamm

MJCT

Thanks for the help.
The strange movements in the X and Y stopped and the Y axis goes for a second pass like it should be.

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
G91 ; relative positioning
G1 H2 Z0.5 F6000 ; lift Z relative to current position
G1 H1 X-295 F1800 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 H1 X-295 F360 ; move slowly to X axis endstop once more (second pass)
G1 H2 Z-0.5 F6000 ; lower Z again
G90 ; absolute positioning

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v2.1.3 on Thu Nov 28 2019 16:04:13 GMT+0000 (Hora padrão da Europa Ocidental)
G91 ; relative positioning
G1 H2 Z0.5 F6000 ; lift Z relative to current position
G1 H1 Y-315 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y5 F6000 ; go back a few mm
G1 H1 Y-315 F360 ; move slowly to Y axis endstop once more (second pass)
G1 H2 Z-0.5 F6000 ; lower Z again
G90 ; absolute positioning