G30 won't go far enough to reach probe

Nightreaver

That happens to me once in a while. For homeall and homez is replaced all G30 with G30 Z-99999

I think that fixes it.

RedWagon

Sorry, I commented out the default ones but the probe is defined earlier with:

M558 P4 I1

I've tried several combinations of the suggestions above but they all do the same thing.

G20
G30 Z-99999
G30 Z-200
M208 Z200
G30
G30 Z-99999
G30 Z-200
M208 S1 Z-200
G30
G30 Z-9999
M208 Z0:200
G30 
G30 Z-999999
M208 Z-200:200sG30 Z-9999
G30
G30 Z-99999

I measured and it dives for 10mm then returns to its original height.

From reading the docs it doesn't really sound like I should be doing a large dive for G30. Do I need to run G28 first with the endstop assigned to Z probe?

dc42

Does your Z axis move the correct amount? For example, if you send G91 followed by G1 S2 Z50 does it move the print head up or the bed down 50mm?

RedWagon

It's off by a little bit; right now it's travelling 8mm per 10mm. Shouldn't be enough for it to run through the max axis settings and not trigger the probe. I tested by doing a G92 Z0 then moving it around manually.

dc42

@redwagon said in G30 won't go far enough to reach probe:

It's off by a little bit; right now it's travelling 8mm per 10mm. Shouldn't be enough for it to run through the max axis settings and not trigger the probe. I tested by doing a G92 Z0 then moving it around manually.

It sounds to me that either your Z steps/mm is a little off, or your Z speed or acceleration is set too high. I suggest you find out which:

Calculate the Z steps/mm from the pitch/lead of your leadscrew mor the belt pitch and number of pulley teeth
If you think you have set the correct Z steps/mm, try reducing Z speed and/or acceleration in M203 and M201

When you have the Z movement sorted, try plain G30 with no parameters.

RedWagon

I've adjusted the Z steps/mm and lowered speed and acceleration. No changes; G30 by itself still lowers 10mm and throws the "Z probe was not triggered during probing move" error.

RedWagon

config.g

M555 P2						; Set output to look like Marlin
G21						; Work in millimetres
G90						; Send absolute coordinates...
M83						; ...but relative extruder moves

; No bed heater
M140 H-1

; Disable Fan 1 thermostatic mode
M106 P1 H-1

; Axis and motor configuration
M569 P0 S0					; Drive 0 goes forwards
M569 P1 S1					; Drive 1 goes forwards
M569 P2 S0					; Drive 2 goes forwards
M569 P3 S1					; Drive 3 goes forwards
M558 P4 I1					; use E0 endstop as Z probe
M574 X1 S2					; bind X homing switch to Z probe
M574 Y0						; radius homing switch present, no turntable homing switch
M669 K7 R0:150 H0.3 F30 A30 			; set Polar kinematics parameters
M666 X0 Y0 Z0					; put your endstop adjustments here, or let auto calibration find them
M350 X16 Y16 Z16 E16:16 I1			; Set 16x microstepping with interpolation
M92 X80 Y80 Z3200			 	; Set axis steps/mm
M906 X1000 Y1000 Z1000 E800 I60			; Set motor currents (mA) and increase idle current to 60%
M201 X1000 Y1000 Z100 E1000			; Accelerations (mm/s^2)
M203 X6000 Y6000 Z100 E3600 			; maximum linear speeds mm/minute
M566 X1200 Y1200 Z1200 E1200			; Maximum instant speed changes mm/minute

; Thermistors
M305 P1 T100000 B3974 R4700 H30 L0		; Put your own H and/or L values here to set first nozzle thermistor ADC correction

M570 S180					; Hot end may be a little slow to heat up so allow it 180 seconds

; Fans
M106 P1 S-1					; disable thermostatic mode for fan 1

; Tool definitions
M563 P0 D0 H1					; Define tool 0
G10 P0 S0 R0					; Set tool 0 operating and standby temperatures
M92 E80:80					; Set extruder steps per mm

;*** If you are using axis compensation, put the figures in the following command
M556 S78 X0 Y0 Z0				; Axis compensation here

M208 Z-0.2:200					; set axis travel limits

T0						; select first hot end

homeall.g

; Home All
G91 ; relative movement
G1 Z4 F100 H1; ensure head is clear of the bed
G1 S1 X-200 F3000 ; move radius towards minimum until the endstop switch is triggered
G1 S2 X5 ; move radius out by 5mm
G1 S1 X-20 F600 H1; move radius slowly to the endstop switch again
; Home Bed
G90 ; absolute movement
G1 S2 X10 ; move to 10mm from centre of bed 
G92 X10 Y0 ; define current position as X10 Y0
; Home Z
; G1 X0 Y0 ; put head over the centre of the bed, or wherever you want to probe
G30 ; lower head, stop when probe triggered and set Z to trigger height

homebed.g

G91 ; relative movement
G1 Z4 F100 H1 ; ensure head is clear of the bed
G90 ; absolute movement
G1 S2 X0 ; move to centre of bed 
G92 X0 Y0 ; define current position as X0 Y0
G91 ; relative movement
G1 Z-4 F100 H1; restore original Z position

homedelta.g

; Example Homing file for RepRapFirmware on delta printer

;M117 Use https://configurator.reprapfirmware.org/ to set up your printer config

;G91							; use relative positioning
;******* Change F250 in the following line to F2500 when you are finished commissioning
;******* Change 320 in the following to a higher value if your Kossel has taller towers
;G1 S1 X320 Y320 Z320 F2500	; move all carriages up 320mm, stopping at the endstops
;G1 S2 X-3 Y-3 Z-3			; move all carriages down 3mm
;G1 S1 X6 Y6 Z6 F250			; move carriages slowly up 6mm, stopping at the endstops
;G1 Z-5 F2000				; down a few mm so that we can centre the head
;G90							; back to absolute positioning
;G1 X0 Y0 F2000				; centre the head and set a reasonable feed rate

homeradius.g

G91 ; relative movement
G1 Z4 F100 H1; ensure head is clear of the bed
G1 S1 X-200 F3000 ; move radius towards minimum until the endstop switch is triggered
G1 S2 X5 ; move radius out by 5mm
G1 S1 X-20 F600 ; move radius slowly to the endstop switch again
G1 Z-4 F100 H1; restore original Z position

homez.g

G91 ; relative movement
G1 Z4 F200 H1; raise head 4mm to ensure it is above the Z probe trigger height
G90 ; back to absolute mode
;G1 X0 Y0 ; put head over the centre of the bed, or wherever you want to probe
G30 ; lower head, stop when probe triggered and set Z to trigger height

dc42

Have you tested the Z probe? https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

RedWagon

I ran through those tests and still get the same results. I have to manually move the printer within 5mm of the Z probe triggering or it will give the error "Z probe was not triggered during probing move"

RedWagon

Finally fixed it!

The missing command was setting the Z endstop to the Z probe with M574 Z1 S2