G30 Insufficient Axes Homed For Bed Probing

Stephen6309 · 17 Jul 2019, 13:26

Have you sent each line of the homing file by itself via the gcode console to see which line is causing the problem?

deckingman · 17 Jul 2019, 13:57

@steve-lynch said in G30 Insufficient Axes Homed For Bed Probing:

When I home all, the very first move moves the gantry to the front of the coreXY printer, and it hits the end stop.. this is at zero... then the x moves right, stops, and goes left to home against the end stop.. then it does the 2nd pass, and moves to bed center, where it triggers the BLTouch, clears the "not homed" light in the Web interface, then it looks like it did what it was supposed to do successfully... except for the "insufficient homed" Message which remains on screen.

Have you actually got the axes all moving in the right directions according to this procedure. https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareCoreXYPrinter

Regardless of that, your homeall.g file is still wrong. Read again what I said about using G1 S1 X-nnn, Y-nnn. That's X and Y minus a value that is the same or greater than your axis maxima rather than X0 Y0.

Also, take out your first G90 absolute command just before the Z5 move. That will try to move to the absolute position of 5mm from Z=0, but until Z has been homed, the firmware has no idea where Z0 is. So keep the move as relative then it will move the Z axis by 5mm from wherever it happens to be (which is what you want).

Edit - I was going to suggest that if tell me what you axes maxima and minima are, I'll post a homing file that you can copy and paste. But on second thoughts, you won't learn that way - it's that "catch a man a fish or teach him to fish thing"

Steve Lynch · 17 Jul 2019, 15:08

@deckingman the machine goes right when I go right, left when I go left, away and towards when I command it to be so. manual gcode moves are also correct... it took a month of playing, but I finally got it going the right way. As I've been posting ad-nauseum (probably driving you guys crazy) the left front (alpha Motor corner) is X0 Y0 max is 300 in both directions.

I do not understand the whole negative value thing you're referring to... so even if my end stop is zero for example, I want to tell it to home to -300?

Believe me, I want to learn to fish, but because of time differences and stuff, it's frustrating to wait 24 hours or more for a reply... 2 weeks have flown by, and I'm no better off than when I started. It would be wonderful to be able to give this a whirl.

Thanks for all your help though man! Seriously! I am learning... it's just a lot to process. I'm a CNC and laser Cutter builder... I'm super comfy with my cartesian configurations, but corexy is a new game for me.

Steve Lynch · 17 Jul 2019, 15:09

@stephen6309 I'll try that!

Steve Lynch · 17 Jul 2019, 16:21

Ok, If I enter the Gcode line by line, I get no errors.

If I run the Homeall, I get an error. I made your changes.... I think.... Am I closer? It still doesn't work right, but i'm learning what's what!

G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
M401 ;deploy mechanical z probe
;G1 S1 X-300 Y-300 F10000 ;move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-300 F10000 ;Now do a fast move just on X and detect end stop
G1 S1 Y-300 F10000 ;Likewise Y

G1 X5 Y5 F6000 ;go back a few mm

G1 S1 X50 F360 ;move slowly to X axis endstop once more (second pass)
G1 S1 Y50 ;then move slowly to Y axis endstop

G1 Z5 F6000 ;lift Z relative to current position
G90 ;absolute positioning
G1 X190 Y150 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

M402 ;retract mechanical Z probe

deckingman · 17 Jul 2019, 16:23

@steve-lynch said in G30 Insufficient Axes Homed For Bed Probing:

I do not understand the whole negative value thing you're referring to... so even if my end stop is zero for example, I want to tell it to home to -300?

Yes. The reason is that the absolute position of 0,0 is where you want the nozzle to be when X and Y are homed. But, when you turn the printer on, the nozzle could be anywhere on the bed but the printer doesn't "know" that. You might have been working in the printer with the power off and manually moved both axes to the maximum position. But the firmware has no idea that you've done that so it has no idea where the nozzle is. Which is the whole purpose of homing - to establish a datum position.

To help you understand, all moves are in fact relative. Absolute moves are moves to a certain position on the bed but this position is relative to the homed position - usually X0, Y0. For example the absolute position of X=100 in your case, means the nozzle is 100mm to the right if the edge of the bed - i.e. 100mm relative to X=0. On the other hand, what we call relative moves are relative to where the nozzle is now. In relative terms G1 X100 means move 100mm to the right from wherever the nozzle happens to be, but in absolute terms G1 X100 means move to a position which is 100mm from X =0.

So until an axis has been homed (i.e. until a datum position is known) all moves have to be relative to where the nozzle is now. When we start the homing process, the nozzle could be anywhere up to the maximum travel distance in either X or Y. In order to find and trigger the end stop, we need to move in a negative direction towards where the end stop is. And because the nozzle could be at (say) X max when we turn in the printer, and we need to enure that it will travel far enough to reach the end stop, then that move must be at least equal to the X max position (it will stop before then if it triggers the end stop - providing you use S1). Doing G1 X0 Y0 won't work because in absolute terms, the firmware has no idea where X0 Y0 is because we haven't yet established that. In relative terms G1 X0 Y0 means move the head by zero mm from where it is now so that won't work either.

Does that help clarify things?

deckingman · 17 Jul 2019, 16:30

@steve-lynch Sorry, I was typing my other lengthy post so didn't see your latest.

Yes you are getting closer.

You can uncomment this line - it saves a bit of time if that first move is a diagonal move which stop when one or other end stops triggers.
;G1 S1 X-300 Y-300 F10000 ;move quickly to X or Y endstop and stop there (first pass)

Your second "G1 Z5 F6000 ;lift Z relative to current position" needs an S2 because at that point in time, the Z axis still hasn't been homed.

Steve Lynch · 17 Jul 2019, 16:30

yes actually, that's kind of what I surmised... That way no matter where it is on the bed, it has a theoretical travel distance equal to the total dimensions of the build volume.. That actually makes perfect sense!
Cheers!

deckingman · 17 Jul 2019, 16:31

@steve-lynch said in G30 Insufficient Axes Homed For Bed Probing:

yes actually, that's kind of what I surmised... That way no matter where it is on the bed, it has a theoretical travel distance equal to the total dimensions of the build volume.. That actually makes perfect sense!
Cheers!

We seem to be typing at the same time - see my latest.

Steve Lynch · 17 Jul 2019, 16:31

@deckingman OOps! I left that commented, because I was observing what each G code did... Forgot to free that back up! Good eye!

Steve Lynch · 17 Jul 2019, 16:36

Dang it! Can ya' throw me a bone? What is it that is causing the error... It seems to be in relation to the first set of moves... this block of moves

;G1 S1 X-300 Y-300 F10000 ;move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-300 F10000 ;Now do a fast move just on X and detect end stop
G1 S1 Y-300 F10000 ;Likewise Y

as soon as the gantry starts moving, it errors... But I do not see any G28 reference in there, or G30 at this stage of the Gcode.... is it right in front of me?

deckingman · 17 Jul 2019, 16:38

@steve-lynch What;s teh error message exactly? And did you put that S2 in the second G1 Z move?

Steve Lynch · 17 Jul 2019, 16:56

G28! (in a little exclaimation Triangle) then below it it says G30 insufficient homing for bed probing

uncommented fthat line, and added S2 to the second Z5...

G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
M401 ;deploy mechanical z probe
G1 S1 X-300 Y-300 F10000 ;move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-300 F10000 ;Now do a fast move just on X and detect end stop
G1 S1 Y-300 F10000 ;Likewise Y

G1 X5 Y5 F6000 ;go back a few mm

G1 S1 X50 F360 ;move slowly to X axis endstop once more (second pass)
G1 S1 Y50 ;then move slowly to Y axis endstop

G1 S2 Z5 F6000 ;lift Z relative to current position
G90 ;absolute positioning
G1 X190 Y150 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

M402 ;retract mechanical Z probe

Phaedrux · 17 Jul 2019, 17:32

@steve-lynch said in G30 Insufficient Axes Homed For Bed Probing:

G1 S1 X50 F360 ;move slowly to X axis endstop once more (second pass)
G1 S1 Y50 ;then move slowly to Y axis endstop

These need to be negative moves again to go back towards the endstop.

And if you're using the BLTouch, just remove these entirely. M401 ;deploy mechanical z probe and M402 ;retract mechanical Z probe. They are not needed. The probe pin will deploy automatically with G30. Deploying it before your other moves risks it either hitting the bed and causing an error, or getting caught on something and breaking.

Steve Lynch · 17 Jul 2019, 18:37

Yeah, That's what I thought.. DC42 Told me to put them back in... I didn't specify what Build I was on... I read that that is handled by Type 9 probe now. Cool!
Thanks!

Steve Lynch · 17 Jul 2019, 18:43

UGH! Still! G30 Insufficient Axes Homed for Bed probing!

we trim more and more off each go-round, but still we do not kill the error!

Phaedrux · 17 Jul 2019, 18:44

@steve-lynch can you post your homeall one more time?

deckingman · 17 Jul 2019, 18:47

@phaedrux said in G30 Insufficient Axes Homed For Bed Probing:

@steve-lynch can you post your homeall one more time?

@Steve-Lynch That - and also your deploy probe and retract probe macros - there could be a move in there that needs an S2

EDIT. Inore that - you aren't now using them

Steve Lynch · 17 Jul 2019, 18:47

G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 S1 X-300 Y-300 F10000 ;move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-300 F10000 ;Now do a fast move just on X and detect end stop
G1 S1 Y-300 F10000 ;Likewise Y

G1 X5 Y5 F6000 ;go back a few mm

G1 S1 X-300 F360 ;move slowly to X axis endstop once more (second pass)
G1 S1 Y-300 ;then move slowly to Y axis endstop

G1 S2 Z5 F6000 ;lift Z relative to current position
G90 ;absolute positioning
G1 X190 Y150 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

Steve Lynch · 17 Jul 2019, 18:49

I posted the deploy and retract above.. they're really short...

deploy just contains M280 P3 S10 I1

retract contains: M280 P3 S90 I1