Z probe offset - off edge of bed...

dbrb2

Hi,
I'm wiring a duet2 wifi up to an X5SA

All sensors and probes now seem to be working (though I think I killed one PWN fan channel...luckily I only need two!)

However, when the print head is at X=0, Y=0, the Z probe is off the side of the bed - which means when I do a home, the Z probe never detects

Does anyone know the appropriate gcode to tell the Z probe to home with an offset of say Z=50, Y=50?

M558 P5 X50 Y50 F500 T5000 H3

But this doesn't seem to have any effect...

PaulHew

@dbrb2 Needs to be done from your G31 IIRC

HTH
Paul

dbrb2

I had tried some G31 variations

The duet uses the offset here to set the X and Y position when the endstops are hit - but in my case this puts the Z sensor off the edge of the board - so after homing X and Y it will need to move in bot h X and Y before homing Z...

PaulHew

OK, I home Z in the middle of the bed. I have an Ender3 Pro and a Hangtight Titan Aero mount, so my Y is off the bed.
My homez.g

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2.1.6 on Mon Jan 13 2020 17:26:38 GMT+0000 (Greenwich Mean Time)
G91              ; relative positioning
G1 H2 Z5 F6000   ; lift Z relative to current position
G90              ; absolute positioning
G1 X122 Y122 F6000 ; go to first probe point
G30              ; home Z by probing the bed

Let get you homing Z first.

Please post your config.g just so we know if you are using RRF2 or 3
And a M115, please

Regards,

Paul.

dbrb2

Ah - some progress:

I updated my homez.g to be similar to yours above, and can now home the Z fine - though I do get the following error:

M280: Invalid servo index 3 in M280 command

"Home All" though still crashes the z into the bed. I haven't yet worked out the relationship between the homez.g, homey.g, homez.g, and homeall - It doesn't look like "homeall.g" simply calls he first three in sequence....

My config.g for z probe is:

; Z-Probe
M558 P5 I1 H5 F120 T6000                ; set Z probe type to inductive and the dive height + speeds
G31 P500 X50 Y50 Z5.0                   ; set Z probe trigger value, offset and trigger height
M557 X15:290 Y15:290 S20                ; define mesh grid

And M115 gives me:
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.05.1 ELECTRONICS: Duet WiFi 1.02 or later FIRMWARE_DATE: 2020-02-09b1

PaulHew

@dbrb2 Please post your config.g and you homez.g
Bits of config.g does not help us

What probe do you have, BL Touch or something else?

Regards,

Paul.

dbrb2

It's an NPN inductive probe. It seems to trigger OK at present when I use "z home" - but "home all axis" causes dthe probe to crash into the bed when it gets to Z - so "home all" doesn't seem to make use of the "homez" gcode....

; Configuration file for Duet WiFi (firmware version 2.03)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu Apr 23 2020 19:55:13 GMT+0100 (British Summer Time)

; General preferences
G90                                     ; send absolute coordinates...
G21                                     ; use mm
M83                                     ; ...but relative extruder moves
M550 P"TronXY X5SA"                     ; set printer name

M669 K1                                 ; select CoreXY mode

; Network
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 S0                              ; physical drive 2 goes forwards
M569 P3 S0                              ; 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 Z1200.00 E420.00      ; 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 X800 Y800 Z800 E800 I30            ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                 ; Set idle timeout

; Axis Limits
M208 X00 Y00 Z0 S1                      ; set axis minima
M208 X310 Y310 Z380 S0                  ; set axis maxima

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

; Filament Run Out Sensor
M591 D0 P1 C4 S1 ; Filament runout Sensor for Extruder E0 on E1 Endstop input P1 = signal HIGH.

; Z-Probe
M558 P5 I1 H5 F120 T6000                ; set Z probe type to inductive and the dive height + speeds
G31 P500 X20 Y20 Z5.0                   ; set Z probe trigger value, offset and trigger height
M557 X15:290 Y15:290 S20                ; define mesh grid

; Heaters
M307 H0 B0 S1.00                        ; disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 R4700             ; set thermistor + ADC parameters for heater 0
M143 H0 S120                            ; set temperature limit for heater 0 to 120C
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 P2 S0 I0 F500 H-1                  ; set fan 2 as part cooling fan
M106 P0 T45 S0.7 H1			; set fan 0 as our hotend fan

; Tools
M563 P0 D0 H1 F2                        ; define tool 0 uses part cooling fan 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

PaulHew

Have you seen this guide?
https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe

Please post homeall.g and homez.g

We will get there!

P.

dbrb2

I think I am getting there - a "home z" now works, as does a "auto bed level compensation"

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu Apr 23 2020 19:55:13 GMT+0100 (British Summer Time)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G90 ; absolute positioning
G1 X50 Y50 F6000 ; go to first probe point
G30 ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position

;G90 ; absolute positioning

However, a "homeall" complains that I have homes insufficient axis (even if run just after a sucesful home X and Y)

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu Apr 23 2020 19:55:13 GMT+0100 (British Summer Time)
G91                     ; relative positioning
G1 H1 X-335  Y-335      ; move quickly to X or Y endstop and stop there (first pass)
G1 X5 Z5 F6000          ; go back a few mm
G1 H1 X-335 F360        ; move slowly to X axis endstop once more (second pass)
G1 H1 Y-335 F360        ; move slowly to Y axis endstop once more (second pass)
G1 X50 Y50		; Move z probe over bed
G1 H1 Z-405             ; then move slowly to Z axis endstop
G1 H1 Z5 F6000          ; lift Z relative to current position
G1 H1 Z-335 F1800       ; move Z down stopping at the endstop
G90                     ; absolute positioning

In addition, the M280 z probe error still occurs - but from what I had seen of the guide you suggested, I had set the probe up as a type 5, which I think is correct....

PaulHew

@dbrb2 as long as the individual homing buttons work, ie homex y and z, you should be able to use this.

Rename homeall.g to OLDhomeall.g

Create a new homeall.g and put the following lines in it.

M98 P"homex.g"
M98 P"homey.g"
M98 P"homez.g"

Regards,

Paul

dbrb2

@PaulHew Cheers - I'll give it a go first thing in the morning

dbrb2

Thanks - that worked

And the M280 issue is also resolved - I had a deploy and retract probe file, but the inductive probe is always in place - so this was referring to a servo that did not exist

Cheers!

PaulHew

@dbrb2 Pleasure, That is what the forum is for!

Regards,
Paul

dbrb2

@PaulHew thanks
Mechanically and electrically all now works. Something I suspect though is wrong in my config still. My 20mmcalibration cube gets this far:

Which doesn't look great, before reliably lifting from the bed entirely. I have set Z quite a few times, and checked the bed temperature. This isn't a problem I had with the old stock board, so I suspect the issue is with my config....perhaps something to do with my extruder settings:

https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165

I'll double check them. Will get there though...try again tomorrow!