Auto level using 3 ball screw

R006

@moth4017
My points are: M671 X-52.00:150.05:372.00 Y23.50:375.05:23.50 S5.0 ;leadscrew at front left, center and front right

moth4017

@R006 are they in the same order as they are in you M584?

R006

@moth4017 Yes
M584 X0 Y1 Z2:3:4 E5

moth4017

@R006

do you have a macro to do you bed leveling like the one above, i have found its better to do 4 points (each corner)

R006

@moth4017 I am using 5 points 1st front left 2nd back left 3rd back middle 4th back right & 5th front right

jay_s_uk

@R006 maybe you should post your bed.g so we can see what you're actually doing

moth4017

@R006 try it without 3rd back middle. and post your macro

R006

@moth4017 @jay_s_uk
G30 P0 X30 Y30 Z-9999
G30 P1 X30 Y270 Z-9999
G30 P2 X150 Y270 Z-9999
G30 P3 X270 Y270 Z-9999
G30 P4 X270 Y30 Z-9999 S3

jay_s_uk

@R006 they should all have separate P numbers for a start...
The S value is wrong if you're wanting to use 5 points.
I also suggest you look at using iteration to perform the measurements more than once

moth4017

My bed.g file as an example

; bed.g  G32
echo "bed.g G32"
M118 P3 S"M118  bed.g" L1
M561                                  ; clear any bed transform
G90
; If the printer hasn't been homed, home it
if !move.axes[0].homed || !move.axes[1].homed 
	G28
if sensors.probes[0].value[0] == 1000 ; if sensor is value other than 1000 do this, 0=probe attached
	echo "already homed, going to pick up probe"
	M98 P"/macros/ProbePickUp"           ; probe pick up
if sensors.probes[0].value[0] == 0    ; Probe the bed and do auto calibration
	G90
	G1 X14 Y44 F20000                     ; go to just above the first probe point
		while true
			if iterations = 5
				M98 P"/macros/ProbeDropOff"       ; probe drop off; end loop
				abort "Too many auto calibration attempts"
			G30 P0 X12 Y12 Z-99999             ; probe starboard bow 
			if result != 0
				continue
			G30 P1 X293 Y12 Z-99999            ; probe port bow
			if result != 0
				continue
			G30 P2 X293 Y274 Z-99999           ; probe port stern 
			if result != 0
				continue
			G30 P3 X12 Y274  Z-99999 S3        ; probe starboard stern   S3 = number  of z axis motors
 
			if result != 0
				continue
			if move.calibration.initial.deviation <= 0.07
				break
			echo "Repeating calibration because deviation is too high (" ^ move.calibration.initial.deviation ^ "mm)"
    
echo "Auto calibration successful, deviation", move.calibration.final.deviation ^ "mm"
G1 F12000 X149.5 Y177.5               ; probe to center bed 	
G30 F2000                             ;Single Z-Probe
M98 P"/macros/ProbeDropOff"           ; probe drop off
G1 Z30 F1000                          ; get the head out of the way

moth4017

@jay_s_uk
hi i thourght the s value was for number of motors as in this example from the Duet 3 documentation
G30 P2 X100 Y10 Z-99999 S3 ; probe point 2 near a leadscrew and calibrate 3 motors

i didnt read it correctly
The S parameter on the last G30 command in the sequence indicates that a complete set of points has been probed and instructs the firmware what sort of calibration to perform.

jay_s_uk

@moth4017

The S parameter on the last G30 command in the sequence indicates that a complete set of points has been probed and instructs the firmware what sort of calibration to perform.

and

Cartesian/CoreXY kinematics: S-1 will report the Z offset for each probed point, but no calibration is done. S0 specifies that the number of factors to be calibrated is the same as the number of points probed. Otherwise, the value indicates the number of factors to be calibrated, which must be no greater than the number of points probed, eg S3 in the above example with 3 points probed

my understanding is its the number of points

moth4017

@jay_s_uk ok when i set it s4 with 4 points probed i get this error
Error: Number of calibration factors (4) not equal to number of leadscrews (3)

jay_s_uk

@moth4017 maybe you're right then

moth4017

@jay_s_uk whick means the documentation on the Duet doc sight is incorrect

jay_s_uk

@moth4017 maybe @droftarts can investigate

R006

@jay_s_uk yes i know it's mistake in copy paste.

Please help me

Phaedrux

What does the console report after you run G32?
If you run it several times in a row, what does it say each time?
How are you homing before?

Please share all your config.g and homing files. It would also be nice to know your firmware version and what type of probe.

moth4017

@R006 i ran this code on my printer

G28
;do what you need to deploy probe
G30 P0 X30 Y30 Z-9999
G30 P1 X30 Y270 Z-9999
G30 P2 X270 Y270 Z-9999
G30 P3 X270 Y30 Z-9999 S3

This is the result in the console

Leadscrew adjustments made: 1.149 -0.144 -0.766, points used 4, (mean, deviation) before (-0.119, 0.653) after (-0.000, 0.023)

you would need to run the same code again without the G28

and here are my results
Leadscrew adjustments made: 0.006 0.021 0.025, points used 4, (mean, deviation) before (0.019, 0.024) after (0.000, 0.023)

you will see that the mean deviation from the first run was
(-0.119, 0.653)
second run
(0.019, 0.024)

the more times you run it the deviation should become less ,

R006

@moth4017 ok i will try this