"Z probe already triggered at the start of the homing move."????

Phaedrux · 4 Feb 2019, 16:44

Can you post your homing files as well?

What type of probe is it?

dc42 · 4 Feb 2019, 17:44

Have you tested your Z probe as described at https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe

crchisholm · 4 Feb 2019, 18:17

@phaedrux I don't have a probe. I have an end-stop. That's part of what is confusing me.

crchisholm · 4 Feb 2019, 18:24

Here are the homing files

; homex.g
; called to home the X axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-305 F1800 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 S1 X-305 F360 ; move slowly to X axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

; homey.g
; called to home the Y axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Y-275 F1800 ; move quickly to Y axis endstop and stop there (first pass)
G1 Y5 F6000 ; go back a few mm
G1 S1 Y-275 F360 ; move slowly to Y axis endstop once more (second pass)
G1 Z-5 F6000 S2 ; lower Z again
G90 ; absolute positioning

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; 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 S2 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning

crchisholm · 4 Feb 2019, 18:28

I say I don't have a probe, but actually I have a BLTouch (still uninstalled and in the original package). I have not printed anything to mount it too yet, so I was hoping to put that off until everything else was setup and working.

Bad Plan???

SupraGuy · 4 Feb 2019, 19:02

@crchisholm said in "Z probe already triggered at the start of the homing move."????:

I say I don't have a probe, but actually I have a BLTouch (still uninstalled and in the original package). I have not printed anything to mount it too yet, so I was hoping to put that off until everything else was setup and working.

Bad Plan???

I wouldn't say that it's a bad plan, particularly if you have everything that you need to get basic printing started without needing the BLTouch sensor to get started.

Adding the sensor isn't too big a deal, and you can always revert back to a known working configuration if you decide that you need to print something else without getting it working.

Phaedrux · 4 Feb 2019, 19:20

@crchisholm said in "Z probe already triggered at the start of the homing move."????:

; Endstops
M574 X1 Y1 S0 ; Set active low and disabled endstops
; Z-Probe
M574 Z1 S2 ; Set endstops controlled by probe
M558 P5 H5 F0 T6000 ; Set Z probe type to switch and the dive height + speeds
G31 P500 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
M557 X15:13 Y15:195 S20 ; Define mesh grid

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; 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

You can change your configuration to use a simple endstop for the Z axis for the time being, and setup the BLTouch later once you have the parts printed.

First you'll need to change the quoted config section above to match the following:

; Endstops
M574 X1 Y1 Z1 S0 ; Set active low and disabled endstops

; Z-Probe
; M574 Z1 S2 ; Set endstops controlled by probe
; M558 P5 H5 F0 T6000 ; Set Z probe type to switch and the dive height + speeds
; G31 P500 X0 Y0 Z0 ; Set Z probe trigger value, offset and trigger height
; M557 X15:13 Y15:195 S20 ; Define mesh grid

Basically just added the Z min endstop to the first M574 command, and commented out the whole z probe section.

For the homing files you'll have to change homez and homeall to not use a G30 command and instead use G1 S1 Z move to seek the endstop.

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:24 GMT-0500 (Eastern Standard Time)
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 Z-300 ; seek end stop
G1 Z5 ; back up 
G1 S1 Z-300 F300 ; home Z again slowly
G90 ; absolute positioning
G1 Z5 ; part nozzle 5mm above the bed

SupraGuy · 4 Feb 2019, 19:38

For that matter, you can set upt he printer to use a manual adjustment for the Z probe

M558 P0

This will allow you to use the Z jog buttons in the DWC as the Z probe, adjusting the Z height to 0 manually until you're ready to print the BLTouch parts.

My earlier response was assuming that you had an already complete kit though.

crchisholm · 5 Feb 2019, 18:34

this worked great. Thanks.
One more question, though. Am I right to assume that the Duet supports either am min or max end-stop, but not both?

Phaedrux · 5 Feb 2019, 18:37

@crchisholm you really only need one or the other to home to, afterwards the firmware will enforce travel limits.

You can use one of the other endstops like e0 or e1 and use it as a general trigger endstop to do whatever you want if triggered. They can all be wired together if you use a switch on each axis for max.

crchisholm · 23 Feb 2019, 15:22

@phaedrux question: the code you show above... can it be entered and exicuted directly in the DWC? I have my printer built and all functionality tested except the BlTouch, so I don’t want to do something now that creates a problem (like a crash into the bed). I think I understand the M557 and M558 commands, and a lessor understanding of the G29, G30 and G31 commands but not real confident yet. Ruining this sfuff like console commands would allow me to dip my toes in the process ( I think)

Phaedrux · 23 Feb 2019, 17:10

Yes every command can be run from the console. The config.g is just a list of commands that gets run in order at startup. There's nothing special about it other than that. Any time a new command is run it takes effect.

So you could enter each line one at a time in the console. Or to make for less typing you could enter the commands into a new macro file called BLTouch test and then run that macro. That way if you want to revert just reboot the duet. If it all tests ok you can put the commands into config.g.

The gcode wiki is a good reference to keep on hand for figuring out how the gcodes work.

G29 is for mesh bed leveling.
G30 runs the macro bed.g. and can be used for a number of things like lead screw leveling. It's not required.
G31 defines the XYZ position of the probe in relation to the nozzle tip. So when the probe triggers the system know where the nozzle is.

crchisholm · 23 Feb 2019, 21:26

This post is deleted!

crchisholm · 23 Feb 2019, 21:28

This post is deleted!

crchisholm · 23 Feb 2019, 21:31

This post is deleted!

Scachi · 23 Feb 2019, 21:40

@crchisholm You have your bltouch connected now ?
Check your sensor signal wiring and the value of your probe-z shown in the web frontend.
If it reads 1000 all the time you may have a wiring problem like bad crimp or using the wrong polarity of your probe signal cable or something like that.

Check the documentation and all the test and probe release reset command mentioned there:
https://duet3d.dozuki.com/Wiki/Connecting_a_Z_probe#Section_BLTouch

crchisholm · 23 Feb 2019, 21:43

I don't know why I am having trouble typing here, but what I actually entered in DWC was...
M557 X0:200 Y0:200 S50
M558 P9 H5 F100 T6000
G32
and I get the Z Probe already triggered before probing move started.

Phaedrux · 23 Feb 2019, 21:58

@crchisholm what do you have in bed.g? That's what gets run when you send g32

crchisholm · 23 Feb 2019, 22:25

@scachi Well, you called that one correctly! I have continuity on four or the five wires all the way from the termination point back to the jack on the BLTouch connector. The white wire does not. I am not sure what I can do about this as my eyes are just not up to working on a connector that small. I may have to return the device back to Amazon and order another. This is frustrating, but then, no body forced me to build this printer. Crap

crchisholm · 23 Feb 2019, 22:30

@phaedrux As you will see from my last, I now have another issue I have to get resolved before I move ahead with this.

To answer your question.....

; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool v2 on Fri Feb 01 2019 16:04:23 GMT-0500 (Eastern Standard Time)
M561 ; clear any bed transform
G29 ; probe the bed and enable compensation

BTW, how do you mark code as you did in your message. I tried <code></code> and that didn't seem to work.