BLTouch XY offset problems

Warringer

I have converted my old A8 into an AM8 and turned to the Duet Wifi for a new controller board from RAMPS.

Now, I wanted to use the BLtouch for bed leveling.

So far, so good. Everything works.

Not the BLtouch bed leveling...

I get the BLtouch to work nicely and consistently. When not trying to get a Mesh of the bed.

When I try to run a full 'Auto Bed Compensation', it moves to the X center of the bed and stops two millimeters in front of the bed (Y axis) and tries to level (which incidentally trashed two Z endstop switches).

When I try to compensate for it with the Y axis offset by making it larger, it stops further from the Y axis bed. It I try to compensate by making the Y offset smaller, it does not even move to the center of the X axis...

Here is the config.g and an image of the position of the BLtouch when trying to run G29...

; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Wed Jan 30 2019 16:08:54 GMT+0100 (Central European Standard Time)

; General preferences
G90                                      ; Send absolute coordinates...
M83                                      ; ...but relative extruder moves

; Network
M550 P"printbot"                         ; Set machine name
M551 P"xxxxxxxxxxxxxx"                         ; Set password
M552 S1                                  ; Enable network
M587 S"xxxxxxxxxxx" P"xxxxxxxxxxx"           ; Configure access point. You can delete this line once connected
M586 P0 S1                               ; Enable HTTP
M586 P1 S0                               ; Disable FTP
M586 P2 S0                               ; Disable Telnet

; Drives
M569 P0 S1                               ; Drive 0 goes forwards
M569 P1 S1                               ; Drive 1 goes forwards
M569 P2 S0                               ; Drive 2 goes backwards
M569 P3 S0                               ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1                  ; Configure microstepping with interpolation
M92 X79.71 Y79.94 Z402.09 E95        ; Set steps per mm
M566 X600.00 Y600.00 Z18.00 E300.00      ; Set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z360.00 E6000.00  ; Set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z100.00 E10000.00 ; Set accelerations (mm/s^2)
M906 X750.00 Y750.00 Z750.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                  ; Set idle timeout

; Axis Limits
M208 X-27 Y-10 Z0 S1                     ; Set axis minima
M208 X220 Y190 Z240 S0                   ; Set axis maxima

; Endstops
M574 X1 Y1 Z1 S0                         ; Set active low and disabled endstops

; Z-Probe
M307 H3 A-1 C-1 D-1                      ; Disable heater on PWM channel for BLTouch
M558 P9 H5 F100 T6000 A10 R0.5 S0.008    ; Set Z probe type to bltouch and the dive height + speeds
G31 P500 X37 Y32 Z2.3                    ; Set Z probe trigger value, offset and trigger height
M557 X20:200 Y20:200 S40                 ; Define mesh grid

; Heaters
M307 H0 B0 S1.00                         ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4388 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S130                             ; Set temperature limit for heater 0 to 130C
M305 P1 T100000 B4388 C7.060000e-8 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S275                             ; Set temperature limit for heater 1 to 275C

; Fans
M106 P0 S1 I0 F500 H1 T45                ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P1 S1 I0 F500 H-1                   ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P2 S1 I0 F500 H-1                   ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Tools
M563 P0 D0 H1                            ; 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

; Automatic saving after power loss is not enabled

; Custom settings are not configured

; Miscellaneous
T0                                       ; Select first tool

alt text

aidar

Looks to me, that your probe is in front and left from nozzle, so in - direction in both x and y. Probe offset is from nozzle to probe, so i guess in G31 command X and Y should be negative, X-37 and Y-32.

Warringer

Certainly worth a try...

EDIT:

Thanks...

Sometimes its the simple things you don't see... >_>