Duet 3 mini 5+ sensorless homing will not work

Alucardi

@Phaedrux if yo have anything to help please tell me. I Dont know what to do. Issue is that it does not detect the stall it just sits there.

Phaedrux

Well let's start with finding the motor current limits.

Here's how I do it.

Set M906 to the rated max of the motor. In my case M906 X2000 Y2000.
Then I use M913 to reduce it to whatever I need it to be for regular usage. 85% for printing, 50% for homing. 20% for idle, etc. That way I know that the M913 percentage is the percentage of the motor max current.

Do all of this with no M915 active.

So start with 85% current and jog the print head around. Reduce it to 70% and jog around, 60% and jog around, 50, 40, 30, 20, 10, 5. At some point in there your motors won't move. When you find that point increase the M913 by 1% until it moves again reliably.

Now that you've found the lowest current needed to have the motors move you can use that amount for sensorless homing and the motors should stall quite easily when blocked.

Once you have that the rest should get easier.

https://forum.duet3d.com/topic/20622/duet-3-mini-5-sensorless-homing-configuration/3?_=1610961629552

This thread has some valuable and specific information on sensorless homing with the mini5+. It's worth reading.

Alucardi

@Phaedrux I have read that thread a million times and still don't understand. I found out that 303 mah works. But still no dice. Sensitivity is -64 which is as sensitive as it goes and will NOT work, i tried 3.3 which i had before but wont work. It detects a stop after a while i think but it is not working as it should, i get error But the then i get error "G28
Error: Insufficient axes homed for bed probing
Error: G0/G1: insufficient axes homed"
So either i have a broken card, a card that will not work with my steppers even though a duet wifi did or i am missing something else. Just to prove it il add a video.
video

Phaedrux

Of the million times did you catch this post?

https://forum.duet3d.com/topic/20622/duet-3-mini-5-sensorless-homing-configuration/24?_=1610996023189

You need to run the stealthChop tuning procedure first. You can do this is the homing files.This is what I suggest:

Execute a tiny move (1 or 2 microsteps) away from the homing direction.
Pause for 100ms using G4.
Execute a small move away from the homing direction, e.g. 10mm.
Execute the homing move.
Don't forget to reduce current for the homing move (M913).

Alucardi

@Phaedrux i must be stupid but i don't understand it and others that have gotten it to work do NOT have that in their homeall.

Alucardi

@Phaedrux Figured it out but no affect.

M400							; finishes all current moves and and thus clears the buffer
M913 X34 Y34 					; drop motor current to 33%
M569 P0.0 P0.1 D3 V100    		; reduce V to ensure stealthChop is enabled
M915 P0.0 P0.1 S-64 R0 F0 H400	; sensitivity, don’t take action, don’t filter
M400 							; finishes all current moves and and thus clears the buffer
G91								; relative positioning
G1 H2 Z10 F6000	    	   		; lift Z relative to current position
G1 H1 X0.1
G4 P100
G1 H1 X20
G1 H1 X-335 F7000		   		; move to X
G1 H1 Y0.1
G4 P100
G1 H1 Y20
G1 H1 Y-348 F7000          		; move to Y
G30 P0 G1 X167.5 Y167.5    		; home Z by probing the bed
G90                   	  		; absolute positioning
M400							; finishes all current moves and and thus clears the buffer
M569 P0.0 P0.1 D2      			; restore default for motor
M913 X100 Y100 					; return current to 100%
M400							; finishes all current moves and and thus clears the buffer

Phaedrux

I don't have my mini5 in a corexy and I use endstops in the cartesian I do have it in, but I can go through setting it up and I can see if I hit any sticking points.

CoreXY is going to be different, but hopefully it's not a deal breaker.

@Alucardi said in Duet 3 mini can't configure sensorless homing + missing extruder:

i must be stupid

Do you need another banana break? Don't despair.

Alucardi

@Phaedrux why does this not work? is it cause other drivers cause it worked fine on my wifi. I need the printer but i wont redesign it for endstops. So if I cannot get this to work before end of this week il make sure to post a video on how to set fire to a mini 5+ lol (that isa promise)
Also i do believe something is broken since it will NOT detect a stall even if i pick -64.

Alucardi

played around with different move types and all i could find. Still no go.

M400							; finishes all current moves and and thus clears the buffer
M913 X50 Y34 					; drop motor current to 33%
M569 P0.0 D3 V60   		 		; reduce V to ensure stealthChop is enabled
M569 P0.1 D3 V60   		 		; reduce V to ensure stealthChop is enabled
M915 P0.0 S-54 R0 F0 H400		; sensitivity X, don’t take action, don’t filter
M915 P0.1 S30 R0 F0 H400		; sensitivity Y, don’t take action, don’t filter
M400 							; finishes all current moves and and thus clears the buffer
G91								; relative positioning
G1 H2 Z10 F6000	    	   		; lift Z relative to current position
G1 H2 X1
G4 P200
G1 H2 X20 F8000
G1 H3X-335 F7000		   		; move to X
G1 H2 X5 F7000
G1 H2 Y1
G4 P200
G1 H2 Y20 F8000
G1 H3 Y-348 F7000 				; move to Y
G30 P0 G1 X167.5 Y167.5    		; home Z by probing the bed
G90                   	  		; absolute positioning
M400							; finishes all current moves and and thus clears the buffer
M569 P0.0 P0.1 D2      			; restore default for motor
M913 X100 Y100 					; return current to 100%
M400							; finishes all current moves and and thus clears the buffer

gloomyandy

@Alucardi I realize this sounds like madness, but can you try setting the stall detection threshold to +63 (so S63 on the M915 for both motors) and see if it detects the stall then.

fcwilt

@Alucardi said in Duet 3 mini can't configure sensorless homing + missing extruder:

played around with different move types and all i could find. Still no go.

As I understand it this is a CoreXY machine.

Why are your X and Y motor settings not the same?

Why are you using G1 H3 moves?

Thanks.

Frederick

Alucardi

@gloomyandy do not work.

Alucardi

@fcwilt how should I move the axis then if not using g1? Should I not use H? In the guide it says to use it. I have tried H1/2/3/4 just to see if it makes any different but it does not.

fcwilt

@Alucardi said in Duet 3 mini can't configure sensorless homing + missing extruder:

@fcwilt how should I move the axis then if not using g1? Should I not use H? In the guide it says to use it. I have tried H1/2/3/4 just to see if it makes any different but it does not.

You are trying to home the X and Y axes to test sensorless homing - correct?

If that is the case G1 H1 is the correct variant to use.

And what about the motor settings being different for X and Y?

Frederick

Alucardi

@fcwilt it makes no difference what h I use. Be look further up and you will see that I used h1 also. S value is difference cause I can then test 2 values at the same time. But it makes for no difference if I use -64 or 64 it still will not detect a stall.

Alucardi

@fcwilt here is a new config still same issue it makes no difference what i do.

M400							; finishes all current moves and and thus clears the buffer
M913 X50 Y34 					; drop motor current to 33%
M569 P0.0 D3 V60   		 		; reduce V to ensure stealthChop is enabled
M569 P0.1 D3 V60   		 		; reduce V to ensure stealthChop is enabled
M915 P0.0 S-50 R0 F0 H400		; sensitivity X, don’t take action, don’t filter
M915 P0.1 S-50 R0 F0 H400		; sensitivity Y, don’t take action, don’t filter
M400 							; finishes all current moves and and thus clears the buffer
G91								; relative positioning
G1 H1 Z10 F6000	    	   		; lift Z relative to current position
G1 H1 X1
G4 P200
G1 H1 X20 F8000
G1 H1 X-335 F5000		   		; move to X
G1 H1 X5 F7000
G1 H1 Y1
G4 P200
G1 H1 Y20 F8000
G1 H1 Y-348 F5000 				; move to Y
G30 P0 G1 X167.5 Y167.5    		; home Z by probing the bed
G90                   	  		; absolute positioning
M400							; finishes all current moves and and thus clears the buffer
M569 P0.0 P0.1 D2      			; restore default for motor
M913 X100 Y100 					; return current to 100%
M400							; finishes all current moves and and thus clears the buffer

fcwilt

@Alucardi said in Duet 3 mini can't configure sensorless homing + missing extruder:

@fcwilt here is a new config still same issue it makes no difference what i do.

OK I will give it a go on my Duet 3 Mini and see if I can get it to work.

This will take a bit of time.

Frederick

fcwilt

@Alucardi

Well I got it to function on my work bench BUT it was erratic - failing more often than working.

Certainly not reliable enough to use.

If I find the problem I will let you know.

Frederick

Phaedrux

@fcwilt What settings did you end up with?

fcwilt

@Phaedrux said in Duet 3 mini can't configure sensorless homing + missing extruder:

@fcwilt What settings did you end up with?

You would ask me that. Let's see...

I basically followed the documentation and used the suggested values.

The following were already in the config file that I was using for testing my new board:

M92 X80
M201 X1000
M203 X10000
M566 X600
M906 X1000 I30

These I added for testing:

M569 P0 S1 V?? (I cannot remember V but it set the crossover speed around 180 mm/s)
M574 X2 S3 (the doc example has M574 X Y S3 which is missing the X and Y values)
M913 X70
M915 X S1 F0 H400 R1 (0.9 stepper - I just grabbed a handy one)

The "home" command was G91 G1 H1 X999 F10000 G90

Now I have never tried this before and I wasn't going to spend a lot of time trying to tweak it.

I was content to verify that it did work sometimes and perhaps just needed different settings or perhaps a different
stepper.

Back to my trusty optical end stop sensors.

Frederick