Homedelta.g Problem

Dave Parry · 30 Oct 2020, 16:38

I've started getting
G28
Error: G0/G1: target position not reachable from current position errors when homing my mini kossel.
I think its the homedelta.g file, because if i rem out the line
; G1 X0 Y0 F2000 ; centre the head and set a reasonable feed rate
it goes away but the head moves sideways after homing to X 10.9 Y2.2 which it didnt do before.
The last changes I did were to th econfig.g file to calibrate the X and Y steps /mm but didnt change anything else.
How do I stop this?
My homedelta.g file is
; Homing file for RepRapFirmware on Mini Kossel
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 Y330 Z320 F5000 ; 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

Veti · 30 Oct 2020, 16:57

what firmware are you on? if its not up to date please update.

the homing file looks like it was generated for a old version of the syntax.

please generate an up to date version using.

https://configtool.reprapfirmware.org

Dave Parry · 30 Oct 2020, 18:12

Thanks, thats cured it.

Dave Parry · 30 Oct 2020, 19:28

No Spoke too soon.
As soon as I put G501 in the config.g file it happens again.
I'm running
Firmware Electronics: Duet 0.85
Firmware Version: 1.26.1 (2020-02-09b1)
Web Interface Version: 1.22.5

the config-override.g file generated is
; config-override.g file generated in response to M500
; This is a system-generated file - do not edit
; Delta parameters
M665 L217.290:217.290:217.290 R106.726 H221.667 B85.0 X-1.474 Y-2.338 Z0.000
M666 X-7.170 Y6.461 Z0.710 A0.00 B0.00
; Heater model parameters
M307 H0 A90.0 C700.0 D10.0 S1.00 V0.0 B1
M307 H1 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H2 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H3 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H4 A340.0 C140.0 D5.5 S1.00 V0.0 B0
M307 H5 A340.0 C140.0 D5.5 S1.00 V0.0 B0

Veti · 30 Oct 2020, 19:29

@Dave-Parry

post your config.g and your config overwrite

Dave Parry · 30 Oct 2020, 19:41

Config.g
; Configuration file for Duet 0.8.5 (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Fri Oct 30 2020 17:48:17 GMT+0000 (Greenwich Mean Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"MiniKossel" ; set printer name
M665 R105.6 L217.29 B85 H248.92 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X-26.4 Y-26.4 Z-26.6 ; put your endstop adjustments here, or let auto calibration find them

; Network
M540 PBE:EF:DE:AD:FE:ED ; set custom MAC address
M552 P192.168.1.49 S1 ; enable network and set IP address
M553 P255.255.255.0 ; set netmask
M554 P192.168.1.1 ; set gateway
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet

; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M92 X83.22 Y77.58 Z79.68 E631.43 ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E1000.00 ; set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 Z-0.1 S1 ; set minimum Z

; Endstops
M574 X2 Y2 Z2 S1 ; set active high endstops

; Z-Probe
M558 P1 H10 F120 T2400 ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X11 Y0 Z1.663 ; set Z probe trigger value, offset and trigger height
M557 R85 S20 ; define mesh grid

; Heaters
M305 P0 T100000 B3950 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M305 P1 T100000 B4388 R4700 ; set thermistor + ADC parameters for heater 1
M143 H1 S280 ; set temperature limit for heater 1 to 280C

; Fans
; M106 P0 S0 I0 F500 H-1 c"Part Cooling" ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S0 I0 F500 H-1 c"Bed Cooling"

; set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned off

; Tools
M563 P0 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
T0 ; select first tool
M501

dont have Config overwrite file

Veti · 30 Oct 2020, 19:48

M92 X83.22 Y77.58 Z79.68

on a delta its better to use M579
https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer#Section_Correcting_for_small_X_and_Y_scaling_errors

how did you arrive at those values?

M666 X-7.170 Y6.461 Z0.710

your endstops are out by quite some bit. that is a difference of 13mm. this could be why the G1 X0 Y0 does not work at Z216

try adjusting them so they are on the same level

Dave Parry · 30 Oct 2020, 19:56

thanks for reply veti
re M579 do I put the steps/mm back to 80 and insert a line M579 with my values in?

The end stops are all pretty near in my config file, those you copied are generated by auto cal, but will check again.

Veti · 30 Oct 2020, 20:01

@Dave-Parry said in Homedelta.g Problem:

M579 with my values in?

see
https://duet3d.dozuki.com/Wiki/Gcode#Section_M579_Scale_Cartesian_axes

@Dave-Parry said in Homedelta.g Problem:

those you copied are generated by auto cal, but will check again.

yes but those are the values used. and they suggest that the endstops are not at the same level.

alternatively you could change the previous line to

G1 Z-15 F2000 ; down a few mm so that we can centre the head

Dave Parry · 30 Oct 2020, 20:40

Have readjusted them, they were'nt that far out but now their within 0.04.
But still have same problem

Phaedrux · 30 Oct 2020, 21:01

Have you tried adding vetis command to lower the print head before trying to move to X0 Y0?

G1 Z-15 F2000 ; down a few mm so that we can centre the head

Error: G0/G1: target position not reachable from current position

This error basically means that you're trying to move the head to a position that would require one of the arms to move higher than it physically can. So when trying to move to x0 y0 it would need to raise one arm higher than it can. Dropping all arms down a bit first will help with that.

Dave Parry · 30 Oct 2020, 21:11

Yes forgot to do that. That solved that, but have developed another problem that the Y axis does'nt always home properly on the first attempt. Particulaly if the head if off centre. Homes ok if I press home a second time.

jay_s_uk · 30 Oct 2020, 21:17

@Dave-Parry increase your home height to the theoretical full travel of the axis.
So of your homes height is 320mm but your carriage could have to travel 400 if it's fully extended then put 400mm in for each axis.

Dave Parry · 30 Oct 2020, 21:27

Great that sorted it. Was getting a bit frustrated with it, but hopefully sorted now

Phaedrux · 30 Oct 2020, 23:44

We're always here to help.

Duke · 11 Nov 2020, 00:20

Hi Guys,
I've been getting this error on my mini Kossel delta as well.
I tried updating the firmware and it's still happening.
My homedelta.g and config.g are as follows:

; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Nov 10 2020 18:53:43 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
;*** Slow homing has been configured. Change F180 to F1800 below when your configuration is working
G1 H1 X265 Y265 Z265 F180 ; move all towers to the high end stopping at the endstops (first pass)
G1 H2 X-5 Y-5 Z-5 F1800 ; go down a few mm
;*** Slow homing has been configured. Change F180 to F360 below when your configuration is working
G1 H1 X10 Y10 Z10 F180 ; move all towers up once more (second pass)
G1 Z-5 F2400 ; move down a few mm so that the nozzle can be centred
G90 ; absolute positioning
G1 X0 Y0 F2400 ; move X+Y to the centre

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Nov 10 2020 18:47:04 GMT-0500 (Eastern Standard Time)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"MiniKossel" ; set printer name
M665 R105.6 L215 B85 H250 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; put your endstop adjustments here, or let auto calibration find them

; Network
M540 PBE:EF:DE:AD:FE:ED ; set custom MAC address
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 forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S1 ; 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 Z80.00 E663.00 ; set steps per mm
M566 X1200.00 Y1200.00 Z1200.00 E1200.00 ; set maximum instantaneous speed changes (mm/min)
M203 X18000.00 Y18000.00 Z18000.00 E1200.00 ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E1000.00 ; set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 Z-0.1 S1 ; set minimum Z

; Endstops
M574 X1 S1 P"!xstop" ; X min active high endstop switch
M574 Y1 S1 P"!ystop" ; Y min active high endstop switch
M574 Z1 S1 P"!zstop" ; Z min active high endstop switch
;M574 Z2 S2 ; configure Z-probe endstop for high end on Z

; Z-Probe
M558 P8 C"zprobe.in" H10 F120 T2400 ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X11 Y0 Z2 ; set Z probe trigger value, offset and trigger height
M557 R85 S20 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B3950 ; 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 B1 S1.00 ; enable 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" T100000 B4388 ; 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

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H-1 ; set fan 1 value. Thermostatic control is turned off

; Tools
M563 P0 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
T0 ; select first tool

Phaedrux · 11 Nov 2020, 00:42

@Duke said in Homedelta.g Problem:

G1 Z-5 F2400 ; move down a few mm so that the nozzle can be centred
G90 ; absolute positioning
G1 X0 Y0 F2400 ; move X+Y to the centre

If it's the same error as the previous poster then increase the size of that Z move to drop the head further. Try -25 instead of -5

Duke · 11 Nov 2020, 00:45

@Phaedrux
That worked perfectly, thank you so much!
I guess I didn't understand this thread as well as I thought, but now it makes more sense.