Z Homing position different by zero

bernardomattiucci

I'm trying to set the machine to zero the Z axis in a non-zero position (like on the Anycubic Chiron). The limit switches are located at Z = 82 (adjustable), while the printing surface is located at Z = 0.

How do I make the firmware understand that before starting the movement of the Z axis it must make sure that it is above the sensor?

Because if actual Z is beyond the sensor, the XY plane is lowered until it meets the sensor.
If the actual Z is below the sensor, if the platen is lowered, the hotend will hit the print platen. And this doesn't have to happen!

jay_s_uk

depending on how you shut your machine down, you could save the location of Z and then use that at power up.
other than that, the machine will have no idea where the Z is to be able to make that choice

bernardomattiucci

I could move the sensors to Z = 5 and modify the homez.g file so that the lifting of the Z axis is 7 mm initial and not 5. In this way, inserting a G92 Z5 in the file, even if I reset the Z axis when Z <5, I would have a way to overcome the sensor and correctly reset.

jay_s_uk

@bernardomattiucci sounds like that would work

fcwilt

I'm not sure what you are trying to do.

Hopefully you can move the Z sensor so you cannot move past it - even when at Z = 0.

If you can do that you don't need to worry about "lifting" Z prior to homing.

Frederick

bernardomattiucci

This is the first result. Low quality, that's true, but that's already something.
I definitely have to adjust the jerk and probably the printing temperature (195 ° C).

The Z sensor, for now, I can not lower it below a certain limit.
Anyway ... I solved the problem. The zeroing takes place regularly with the Z sensor placed at Z = 10.

From console:
M201: Accelerations (mm/sec^2): X: 1000.0, Y: 1000.0, Z: 100.0, E: 4000.0
M203: Max speeds (mm/min): X: 20000.0, Y: 20000.0, Z: 1000.0, E: 5000.0, min. speed 30.00
M204: Maximum printing acceleration 10000.0, maximum travel acceleration 10000.0
M205: Maximum jerk rates (mm/sec): X: 66.7, Y: 66.7, Z: 5.0, E: 25.0
M566: Maximum jerk rates (mm/min): X: 4000.0, Y: 4000.0, Z: 300.0, E: 1500.0, jerk policy: 0

the values of M201 I changed them to X5000 and Y5000. I don't know why they were X1000 and Y1000.

New M201: Accelerations (mm/sec^2): X: 5000.0, Y: 5000.0, Z: 100.0, E: 4000.0

fcwilt

@bernardomattiucci

M205 and M556 set the same thing - just using different units.

I've never found a reason to use M204.

For starters you can try the default values for everything but M92 and M906.

Just comment out M201, M203, M204, M205 and M556 and re-boot.

If you wish to see the defaults just enter those commands with no parameters at the DWC console.

What material are you printing?

Do you have part cooling fan(s)?

Frederick

Phaedrux

@fcwilt said in Z Homing position different by zero:

I've never found a reason to use M204.

The only reason is to have faster travels than print moves.

fcwilt

@Phaedrux said in Z Homing position different by zero:

@fcwilt said in Z Homing position different by zero:

I've never found a reason to use M204.

The only reason is to have faster travels than print moves.

Given the numerous settings in slicers for speeds, etc in practice is M204 truly useful?

Frederick

Phaedrux

@fcwilt Given it's vintage it was a good option at the time. Some people also don't want to bake settings like that into gcode files since it's not adjustable after the fact.

bernardomattiucci

Goodmorning everyone

I had entered the codes M566, M203 and M201 in the config.g file to find the speed "limits" of the X and Y axes.
Now the 3 instructions in the file have been commented out.
From the Console I get this:

Custom M566
;M566 X4000.00 Y4000.00 Z300.00 E1500.00           										; set maximum instantaneous speed changes (mm/min)

Original M566
Maximum jerk rates (mm/min): X: 900.0, Y: 900.0, Z: 12.0, E: 120.0, jerk policy: 0

Custom M203
;M203 X20000.00 Y20000.00 Z1000.00 E5000.00       										; set maximum speeds (mm/min)

M203
Max speeds (mm/min): X: 6000.0, Y: 6000.0, Z: 300.0, E: 1200.0, min. speed 30.00

Custom M201
;M201 X5000.00 Y5000.00 Z100.00 E4000.00           										; set accelerations (mm/s^2)

M201
Accelerations (mm/sec^2): X: 500.0, Y: 500.0, Z: 20.0, E: 250.0

I'll do some printing tests with the default values and let you know.

bernardomattiucci

The settings of M566, M203 and M201 are the default ones.

Surely I have to fix the slicer settings (Cura 4.8).

fcwilt

@bernardomattiucci

That is not good.

Do you have a part cooling fan or fans?

And what material are you printing?

The first thing I would work with is your extrusion settings.

Frederick

bernardomattiucci

@fcwilt said in Z Homing position different by zero:

That is not good.

With the old electronics the print quality was much better, even if the speed did not exceed 33 mm / s.

Do you have a part cooling fan or fans?

Yes, I have a layers fan but I fear that the flow from the duct does not come out perfectly. I'll have to improve it. But I need suggestions.

And what material are you printing?

PLA, 180/185°C

The first thing I would work with is your extrusion settings.

I started from a print speed of 60mm / sec and am adjusting the speed of the outer walls, decreasing it by 5mm / sec each print.
I would like to avoid printing at too low a speed. But if I can't solve it, I'll start with the 30mm / sec of the old electronics.

Bernardo

jay_s_uk

Can you post your whole config? Have you set the correct thermistor?

bernardomattiucci

@jay_s_uk

; Communication and general
M111 S0                         														; Debug off
M550 P"Quadra 600"							  											; Machine name and Netbios name (can be anything you like)

;*** Networking
M552 S1																					; Turn network on
M586 P0 S1              																; enable HTTP
M586 P1 S0              																; disable FTP
M586 P2 S0              																; disable Telnet

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

; Drives
M569 P0 S0																				; X Axis - physical drive 0 goes forwards
M569 P1 S0																				; Y Axis - physical drive 1 goes forwards
M569 P3 S0																				; Extrusor - physical drive 3 goes forwards
M569 P5 S0																				; Z1 Axis - physical drive 5 goes forwards
M569 P6 S0																				; Z2 Axis - physical drive 6 goes forwards
M569 P7 S0																				; Z3 Axis - physical drive 7 goes forwards
M569 P8 S0																				; Z4 Axis - physical drive 8 goes forwards

M584 X0 Y1 Z5:6:7:8 E3																	; set drive mapping

M350 X16 Y16 Z16 E16 I1                       											; configure microstepping with interpolation
M92 X80 Y128.00 Z800.00 E102.16            												; set steps per mm
;Default M566 X900 Y900 Z12 E120 P0
;M566 X1800.00 Y1800.00 Z24.00 E240.00           										; set maximum instantaneous speed changes (mm/min)
;Default M203 X6000 Y6000 Z300 E1200 I30
;M203 X12000 Y12000 Z600 E2400   			    										; set maximum speeds (mm/min)
;Default M201 X500 Y500 Z20 E250
;M201 X1000 Y1000 Z40 E500	           													; set accelerations (mm/s^2)

M906 X1275 Y1875 Z1875 E1275 I30                  										; set motor currents (mA) and motor idle factor in per cent (60-90% of nominal current)
M84 S30                                       											; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                              											; set axis minima
M208 X602 Y602 Z602 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 S1 P"duex.e2stop+duex.e3stop+duex.e4stop+duex.e5stop"                     ; configure active-high endstop for low end on Z via pin duex.e2stop+duex.e3stop+duex.e4stop+duex.e5stop
;M574 Z1 S1 P"duex.e5stop"

M669 K0																	                ; select Kinematics Y to react with X and Z

; Z-Levelling
;M558 P0; H5 F120 T6000                       											; disable Z probe but set dive height, probe speed and travel speed
;M557 X15:587 Y15:587 S20                      											; define mesh grid

;M671 X-115:-115:715:715 Y130:470:470:130											; Z leadscrews are at Z2 (-115.130) Z2 (-115.470), Z3 (715.470), Z4 (715.130)

; Thermistors
;M140 H-1                                      											; disable heated bed (overrides default heater mapping)

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 											; 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 B4092  											; A"MK8"  ; 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 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 T45                              											; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0 S"Estrusore MK8"             											; 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

; Miscellaneous
M575 P1 S1 B57600                             											; enable support for PanelDue

M18 Z E0

M208 S1 Z-0.2

T0

@jay_s_uk said in Z Homing position different by zero:

Have you set the correct thermistor?

Honestly, I have no idea. I used the values of the old electronics.

jay_s_uk

@bernardomattiucci
are you using stock thermistors? if so, what printer is it?

bernardomattiucci

@jay_s_uk said in Z Homing position different by zero:

@bernardomattiucci
are you using stock thermistors? if so, what printer is it?

Thermistor 100 KΩ...

but i have no idea what it is (make / model). They gave me 3 supplied with the MK8 extruder.

bernardomattiucci

bernardomattiucci

Consider that, at the moment, I have no way to control the temperature of the hob. I have an electric "stove" lit under it which keeps the aluminum surface (and the glass surface) hot enough to be able to print (ambient temperature below 20 ° C).