G30 S-1 is giving me heart stitches [SOLVED]

o_lampe

@Veti said in G30 S-1 is giving me heart stitches:

@o_lampe said in G30 S-1 is giving me heart stitches:

Now, when I home Z, the homed height is set to -2 or whatever I set in M208.

post you home script

G91
G29 S2
G1 S1 Z-300 F800
G1  Z5 F800
G1 S1 Z-10
;G92  Z0.0
G90
;G29 S1

What does it mean, when DWC is giving me a warning about Z=0 datum isn't set everytime i load the heightmap?
Is it trying to do that, when it crashes against the leadscrew?
I've made two short videos to show what happens, but I'm not sure when I find the nerve to upload them to u-tube.

Veti

that is not a home script. as it disregards any endstop

nevermind. it used the old S syntax.

that is the reason why its set to S-1
when the endstop is triggered the axis is set to the endstop position.
with a G30 this will not happen as this sets the current positon to z=0

that would also get rid of the Z=0 datum message.

o_lampe

@Veti
To be clear, it uses the Z-probe as endstop.

Veti

that is wrong.

try a default homez.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.2.2 on Wed Jan 20 2021 13:31:39 GMT+0100 (Central European Standard Time)
G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G90 ; absolute positioning
G1 X15 Y15 F6000 ; go to first probe point
G30 ; home Z by probing the bed

; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning

o_lampe

@Veti said in G30 S-1 is giving me heart stitches:

with a G30 this will not happen as this sets the current positon to z=0
that would also get rid of the Z=0 datum message.

So, I should use G30 instead of G1 S1?

Veti

@o_lampe

yes

you REALLY need to use a standard config that is generated by the config tool.

o_lampe

@Veti said in G30 S-1 is giving me heart stitches:

@o_lampe

yes

you REALLY need to use a standard config that is generated by the config tool.

I started filling out the config wizard, but then got stuck with the stepper settings. I would have to copy my existing config settings into the wizard, so what is it good for?
I'd just copy any possible mistake into the new file, if there's any...

Veti

@o_lampe
well it would have generated a correct homing script for once.
and as i said it will make the migration to version 3 easier

o_lampe

@Veti said in G30 S-1 is giving me heart stitches:

G1 X15 Y15 F6000 ; go to first probe point

The head moves to that first probe point and then throws an error insufficient axes homed
As always I homed X/Y before homeZ with G92 X0 Y0.

Do I really have to install endstops for X/Y axis?
I never needed them for my CNC. I just parked the toolhead at 0,0 before I switched off and went the G92 way to start...
I checked the homeX/Y files. They all look similar to the one I originally posted. (I had this SD-card backup from my CNC machine)

Veti

the G30 command give you insufficient axis homed?

fcwilt

@o_lampe said in G30 S-1 is giving me heart stitches:

As always I homed X/Y before homeZ with G92 X0 Y0.

The would work IF the actual positions of X and Y were zero. How do you know they are?

Do I really have to install endstops for X/Y axis?

No - you can use sensor-less homing.

I don't care for that myself. To me using physical end stop sensors for homing is like stopping your car using the brakes. Sensor-less homing seems like stopping your car by running into the car in front of you.

As to using G30: did you read the docs on what each variant of G30 does?

Frederick

o_lampe

@Veti said in G30 S-1 is giving me heart stitches:

the G30 command give you insufficient axis homed?

No, the macro doesn't run G30 because of the error message.

I used jumpers on X/Y endstops and defined them as active high
When I ask M119 it reports X/Y at min endstops. Now I should be able to use the homeall macro. But it stops after the same line as above mentioned.

Veti

post your homeall then

o_lampe

@fcwilt said in G30 S-1 is giving me heart stitches:

As to using G30: did you read the docs on what each variant of G30 does?

Yes, and I also tried some other versions with various Px and Sx parameters.

o_lampe

@Veti said in G30 S-1 is giving me heart stitches:

post your homeall then

; homeall file for use with dc42 Duet firmware on CoreXY printers
; This file assumes the endstop switches are at the low end of each axis.
; Reverse the X and Y movement for high-end switches.
; Adjust the bed upper and lower limits in config.g (M208 commands) to get the correct homing positions

G91                       ; relative mode
G1 F2400 		   		; course home X or Y //S1 X-340 Y-240 
G1 S1 X-340               ; course home X
G1 S1 Y-240               ; course home Y
G1 X14 Y14 F600             ; move away from the endstops
G1 S1 X-20                ; fine home X
G1 S1 Y-20                ; fine home Y
G1 X20 Y20 F4000
G1 F600
G1 S1 Z-300 F600
G1 Z5 F200
G30

; If you are using a microswitch for Z homing, insert similar code for the Z axis here,
; but use lower feed rates suitable for your Z axis.

G90                       ; back to absolute mode

; If you homed the Z axis using an endstop switch, you can insert a G92 command here to correct the height.

Veti

what script wont work without endstops

o_lampe

with the homeall script the behaviour is a bit different: it runs to 20,20 then probes (G1 S1) and runs against the rear beam.

Whenever G30 is issued,the printer freaks out.

o_lampe

@Veti
that was just my interpretation why homeZ doesn't work even after I homed X/Y
Seems the fake endstops doesn't change anything

Veti

if you dont want to use endstops, you should just setup sensorless homing

https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing

fcwilt

@o_lampe said in G30 S-1 is giving me heart stitches:

with the homeall script the behaviour is a bit different: it runs to 20,20 then probes (G1 S1) and runs against the rear beam.

Whenever G30 is issued,the printer freaks out.

Do you understand what a G1 command with the S1 (now H1) parameter does?

If you have the X and Y end stops forced active your homeall.g script will not work.

If you wish to use the Z probe for homing you don't use any G1 S1 Znnn command - just G30 BUT you likely want to use a G1 Xnnn Ynnn command to move to the center of the bed first.

You also need to have M574 Z0 and a valid Z probe configuration - which you appear to have.

If you aren't going to have actual end stops and are not going to use sensor-less homing you can force any axis to be "homed" with G92 Xnnn (or Y) but naturally the value nnn should be where the axis is actually positioned at the time.

I suggest you just install actual end stop sensors.

Frederick