Leveling the bed...

TLeTourneau

@tletourneau said in Leveling the bed...:
Just an update, I think I figured out my issue resetting the BLTouch. I was doing a M280 P7 S160 and I needed to do a M280 P7 S160 I1 because I am using the heater 7 connection without an expansion board connected. My readings are still odd, here is what I am doing: The process I used is: power on the machine, input the G92 X20 Y20 Z20 so I can leave the head in the same spot, set the bed to have a light drag on a piece of 20lb paper and run the G92 Z0 and then the G30 S-1. The G30 S-1 command seems to raise the bed at the end, should it? That might make it hard to achieve repeatable results.

I've installed anti-backlash nuts on the bed and a 330x330x3mm borosilicate glass plate with an interface between the glass and the bed of a sheet of 0.5mm high temp silicone rubber.

Here are the results:

BLTouch on glass:
-0.598
-0.610
-0.587
-0.645
-0.582

BLTouch with blue painters tape on glass:
-0.585
-0.605
-0.600
-0.600
-0.587
-0.600

I entered the following commands between each iteration:
G92 Z0
G30 S-1
M280 P7 S160 I1

Again, I noticed the bed raising after the probe took it's reading whenever the G30 S-1 was executed.

I am including my config file in case that helps:

; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Nov 16 2018 15:16:22 GMT-0600 (Central Standard Time)

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

M667 S1                                            ; Select CoreXY mode

; Network
M550 P"Tronxy X5S"                                 ; Set machine name
M552 P192.168.0.95 S1                              ; Enable network and set IP address
M553 P255.255.255.0                                ; Set netmask
M554 P192.168.0.1                                  ; Set gateway
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 backwards
M350 X16 Y16 Z16 E16 I1                            ; Configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E98.00                   ; Set steps per mm
M566 X600.00 Y600.00 Z12.00 E120.00                ; Set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z180.00 E1500.00          ; Set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z100.00 E10000.00           ; Set accelerations (mm/s^2)
M906 X1100.00 Y1100.00 Z1100.00 E1100.00 I30       ; Set motor currents (mA) and motor idle factor in per cent
M84 S30                                            ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                                   ; Set axis minima
M208 X330 Y330 Z400 S0                             ; Set axis maxima

; Endstops
M574 X1 Y1 S0                                      ; Set active low endstops

; Z-Probe
M574 Z1 S2                                         ; Set endstops controlled by probe
M307 H7 A-1 C-1 D-1                                ; Disable heater on PWM channel for BLTouch
M558 P9 H5 F100 T6000 A5 R0.3 S0.005 B1            ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X-42 Y-4 Z0                                ; Set Z probe trigger value, offset and trigger height
M557 X15:315 Y20:315 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 P0 S0.3 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
M106 P2 S1 I0 F500 H1 T45                          ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; 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 power saving
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss

; Custom settings
M591 D0 P1 C3 S0

I'm going to run a mesh grid and see what I get, I've set the sensitivity back to 0.005.

Phaedrux

I don't suppose you could post a video showing the behaviour of the probe?

TLeTourneau

Well, it's better and running with a sensitivity of 0.005 again. I'll try to fine tune it tomorrow and run a 240 point mesh and see how it goes.

TLeTourneau

@phaedrux I'll make one tomorrow and post it.