Z axis not homing

jay_s_uk

@prior123 can your printer even reach X-38 Y-10?
Post your config.g

jay_s_uk

@prior123 you may also want to check your retractprobe.g as well

PRIOR123

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Tue Mar 16 2021 15:54:40 GMT+0000 (Greenwich Mean Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"" ; set printer name

; Network
;M551 P"" ; set password
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0 S1 ; physical drive 0 goes backwards
M569 P1 S1 ; physical drive 1 goes backwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z400.00 E93.00 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X600 Y600 Z600 E600 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X-5.5 Y-10 Z0 S1 ; set axis minima
M208 X220 Y220 Z250 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-49 Y9 Z1.597 ; set Z probe trigger value, offset and trigger height
M557 X-15:165 Y20:230 S20 ; define mesh grid
;M557 X5:205 Y5:165 S20 ; Define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T98801 B4185 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T98801 B4185 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 C"Part Cooling" S0 H-1 ; set fan 0 name and value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 C"Heatsink/Hotend" S1 H1 T45 ; set fan 1 name and value. Thermostatic control is turned on
M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
M106 P2 C"PartCooling" S1 H1 T45 ; set fan 2 name and value. Thermostatic control is turned on

; Tools
M563 P0 S"PrintHead01" D0 H1 F0 ; 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

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
T0 ; select first tool

PRIOR123

@jay_s_uk This has stopped the warning sign! thank you

jay_s_uk

@prior123 all sorted now?

PRIOR123

@jay_s_uk

the homing error is fixed but the x and y positioning when homing the Z via home all isnt working

jay_s_uk

@prior123 because you're in absolute mode. Surely X-38 Y-10 is off your bed or even outside your axis limits

PRIOR123

@jay_s_uk so should i comment out that line then? sorry im pretty unknown when it comes to programming

jay_s_uk

@prior123 well where do you want the nozzle to move to when you do the G30?

PRIOR123

@jay_s_uk probably X-60 and Y-10

But i just changed that in the homeall.g and it doesnt seem to be doing anything

jay_s_uk

@prior123 how? That's way outside your bed limits set in M208 in your config

PRIOR123

@jay_s_uk this has helpe massively! thank you.

How can i work out the true measurements essentially ive defined it all no with

M208 X60 Y-10 Z0 S1 ; set axis minima
M208 X235 Y235 Z260 S0 ; set axis maxima

however im not trying to define the mesh coordinates and i am continuously getting this

Warning: Skipping grid point X=200.0, Y=180.0 because Z probe cannot reach it
Warning: Skipping grid point X=220.0, Y=180.0 because Z probe cannot reach it
Warning: Skipping grid point X=220.0, Y=200.0 because Z probe cannot reach it
Warning: Skipping grid point X=200.0, Y=200.0 because Z probe cannot reach it

PRIOR123

@prior123 the Z probe can go further im just really confused why it thinks it cant

jay_s_uk

@prior123 your z probe has an offset of x-49. That means it can probe any further than 49mm before your x maximum. So with a maximum of 235, you can only probe up to X186 (otherwise the nozzle will have to go outside the machine limits)

PRIOR123

@jay_s_uk said in Z axis not homing:

235

sooo close now

ive recalibrated the Z probe, and redefined both the bed size and mesh size.

I have just one last issue it still wont hit the last point on the bed and throws out an error before continuing the rest of the G32 code

G31 P500 X-43 Y10 Z3.79 ; set Z probe trigger value, offset and trigger height
M557 X60:260 Y30:245 S20 ; define mesh grid

i thought it may have been the S value but that doesnt seem to make sense as 20 goes into 260

any more ideas?

jay_s_uk

@prior123 what error does it throw

PRIOR123

@jay_s_uk
G32
Warning: Skipping grid point X=240.0, Y=30.0 because Z probe cannot reach it
Warning: Skipping grid point X=260.0, Y=30.0 because Z probe cannot reach it
Warning: Skipping grid point X=260.0, Y=50.0 because Z probe cannot reach it
Warning: Skipping grid point X=240.0, Y=50.0 because Z probe cannot reach it

jay_s_uk

@prior123 again, you cant probe those points because your nozzle will go outside your axis limits. Based on 260, the closest you can go is X217

fcwilt

@prior123 said in Z axis not homing:

@jay_s_uk
G32
Warning: Skipping grid point X=240.0, Y=30.0 because Z probe cannot reach it
Warning: Skipping grid point X=260.0, Y=30.0 because Z probe cannot reach it
Warning: Skipping grid point X=260.0, Y=50.0 because Z probe cannot reach it
Warning: Skipping grid point X=240.0, Y=50.0 because Z probe cannot reach it

If the warnings are in response to G32 we need to see your bed.g file.

Do you understand how the probe X and Y offsets limit where the probe can reach?

And, just FYI, I find it easier to use the P parameter for M557 rather than the S parameter. I care more about the number of grid points rather than the actual spacing of the grid points.

Frederick

PRIOR123

@fcwilt said in Z axis not homing:

557
; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Tue Mar 16 2021 15:54:40 GMT+0000 (Greenwich Mean Time)
M561 ; clear any bed transform
G29 ; probe the bed and enable compensation

What would i put for the M557 if it wasnt using an S value? i only put an S value because it feels easier to understand if i know the distance