Spoted a little bug on Z prob I think

[Donpi]

Hi,

when I home Z and the blTouch senor is allready triggered.
I get the message that the sensor is allready triggered and no z movement.
This is the expected behaviour, I hope.

What I think is a bug is that the Z change state to homed.
I think It should remain unhomed.

I use RFF 3.1.1, a Duet 3 and a blTouch.
And here is my homez.g

;Clear bed transformation
N561
 
;Goto prob position
G91
G1 H2 Z5 F6000
G90
G1 X150 Y70 F6000
G91
 
;Reset sensor
M280 P0 S160
 
;Rough prob
M402 ; Retract prob
M401 ; Deploy prob
G1 H1 Z-305 F6000
M402 ; Retract prob
 
;Down 5mm
G1 H2 Z5 F6000
 
;Fine prob
M402 	; Retract prob
M401 	; Deploy prob
G30 	; Prob
M402 	; Retract prob

[dc42]

I agree, it should remain not homed. I will test this.

[dc42]

It's not a bug, it's because you are using the Z probe as an endstop switch in this line:

G1 H1 Z-305 F6000

That will mark Z as homed.

You should use a G30 command for that line too. You can use M558 to set the probing speed (F parameter) to a higher value before the first G30 command, and restore it to the usual value for the second.

[Donpi]

@dc42 haha great I did as you said and by the way removed all those unnecessay M401 and M402.
Now it remains not homed.

Thank you.

[A Former User]

N561

Also I think your code N561 is wrong.

I think it should be M561: Set Identity Transform

[Donpi]

@CaLviNx Thanks I didn't see this.
By the way it explain some weird behaviour I had in the past