Auto level using 3 ball screw

R006

hey,

I am writing to seek assistance with a leveling issue I am experiencing in the Z-axis of my system. The system incorporates three ball screws, and during the leveling process using paper at the center point, I observed that the nozzle touches the paper at the center, while the other two points are slightly loose and tight, respectively, in comparison to the center point.

To address this issue, I executed the G32 command, attempting to center the pointer and make it tighter. However, the problem persists. I would appreciate your guidance and expertise in resolving this matter.

Could you please provide recommendations or steps to ensure that the ball screws are properly leveled and the nozzle maintains consistent contact across all points?

Can any one Explain me which is reference pitch & roll?

please refer the image.

Screenshot 2024-02-05 101826.jpg

Any suggestion? @dc42 @Phaedrux @mrehorstdmd

moth4017

hi
you to define your z axis rod positions with respect to x 0, y0 in your config like this

;Ball joint 3pl
M671 X-15:318:152 Y-15:-15:318 S35 ;leadscrews at front left,front right, rear Center s= max correction factor must be in same order as M584

moth4017

then in a macro you will need to do the following
bed.g
G28 ; home
M401 ; deploy Z probe
G30 P0 X 1stpos Y1stpos Z-99999 ; probe near an adjusting screw
G30 P1 X2nd pos Y2nd pos Z-99999 ; probe near an adjusting screw
G30 P2 X3rdpos Y3rd pos Z-99999 S3 ; probe near an adjusting screw and report adjustments needed
M402 ; retract probe

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