Duet3 6CH + 3CH expansion board - Missing steps.

dc42

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42

I tried to connect XY to expansion board and E to Duet3, now X and Y missing steps... So it has to be something wrong...

Are you sure they are missing steps? Has there been a layer shift?

dc42

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

So there is 1233.9 mm discrepancy...

Please provide the GCode file you are printing, and I will run it on my bench system, using the config.g file you have already posted.

evomotors

@dc42
No, It is likely a layer shifts on every layer when I wired YX motors to the expansion board.

So any motor connected to expansion board is under powered for some reason in my setup.

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

So there is 1233.9 mm discrepancy...

Please provide the GCode file you are printing, and I will run it on my bench system, using the config.g file you have already posted.

To save time I tried just a simple cookie cutter from thingiverse bun.gcode

But I think you are right and the issue could be with motor stalling, but it's not stalling because of the bed motor or mechanical issue as when I switched XY to the EXP3HC, XY started stalling. So there is something wrong with drivers current adjustments.

I have exactly the same issue with tool board. I had to use E motor driver on Duet 3 instead of Tool-Board as I had exactly the same issue.

deckingman

@evomotors Just a suggestion - if you run M122 B1 during a print do all the voltages look good? No under voltage events or anything like that? It sounds a bit like power supply issue (to the expansion board) but I'd have thought that would show up as under voltage.

evomotors

@deckingman said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors Just a suggestion - if you run M122 B1 during a print do all the voltages look good? No under voltage events or anything like that? It sounds a bit like power supply issue (to the expansion board) but I'd have thought that would show up as under voltage.

M122 B1 always showing up something like this, never under voltage.

VIN: 24.7V, V12: 12.3V

evomotors

@dc42
Any news on running test?

evomotors

@dc42
So XY wasn't staling, expansion board just couldn't keep up step rate at 250mm/s travel moves.

dc42

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42
So XY wasn't staling, expansion board just couldn't keep up step rate at 250mm/s travel moves.

What was the steps/mm and microstepping for the motor on the expansion board? Are you certain that you were running RRF 3.2 on both boards? [EDIT: your M122 reports indicate that you are, assuming you haven't downgraded firmware since then.]

PS:

Why are you sure that it couldn't keep up? Perhaps because it worked at a lower speed?
Did you capture a M122 B1 report after the print at 250mm/sec travel speed?

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42
So XY wasn't staling, expansion board just couldn't keep up step rate at 250mm/s travel moves.

What was the steps/mm and microstepping for the motor on the expansion board? Are you certain that you were running RRF 3.2 on both boards? [EDIT: your M122 reports indicate that you are, assuming you haven't downgraded firmware since then.]

PS:

Why are you sure that it couldn't keep up? Perhaps because it worked at a lower speed?

Did you capture a M122 B1 report after the print at 250mm/sec travel speed?

It was the same micro stepping on the expansion board as in my config (x16). I'm running conservative jerk but pretty fast acceleration.

; configure microstepping with interpolation                
M350 X16 Y16 Z1 E8 I1
       
; set steps per mm
M92 X160.00 Y160.00 Z200.00 E172

; set maximum instantaneous speed changes  (jerk) (mm/min)      	   
M566 X500.00 Y500.00 Z50.00 E3000.00  

; set maximum speeds (mm/min)     
M203 X30000.00 Y30000.00 Z1200.00 E180000.00

; set accelerations (mm/s^2)
M201 X10000.00 Y10000.00 Z100.00 E5000.00

Yes I'm sure I'm running 3.2, I did not downgrade.

It appeared fine on print moves but was layer shifting after each fast travel move.
Unfortunately I didn't capture after trying to use expansion board for XY

deckingman

@evomotors Suggestion. If you can, run a print with XY on the mainboard and take a video of it - nothing fancy - a phone should be good enough. Then put the XY motors on the expansion board and run the same print and video that. The might provide the evidence................

evomotors

@deckingman said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors Suggestion. If you can, run a print with XY on the mainboard and take a video of it - nothing fancy - a phone should be good enough. Then put the XY motors on the expansion board and run the same print and video that. The might provide the evidence................

And post it on YouTube? that will give negative advertisement to Duet3d, I don't have many subscribers, but it will have at least 300 to 400 views.

Phaedrux

We're not afraid of troubleshooting.

evomotors

@Phaedrux said in Duet3 6CH + 3CH expansion board - Missing steps.:

We're not afraid of troubleshooting.

I spent 3 month troubleshooting exactly the same issue (inconsistent or under extrusion) on the tool-board, finally I had to remove it completely from my printer. And then I made the same mistake ordering expansion board....

Phaedrux

I am sorry you're having issues. We'd very much like to get to the bottom of it and have a solution for you.

deckingman

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@deckingman said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors Suggestion. If you can, run a print with XY on the mainboard and take a video of it - nothing fancy - a phone should be good enough. Then put the XY motors on the expansion board and run the same print and video that. The might provide the evidence................

And post it on YouTube? that will give negative advertisement to Duet3d, I don't have many subscribers, but it will have at least 300 to 400 views.

...or just upload it to google drive or dropbox. But then again, there is already this video of mine on YouTube comparing Duet 2 with Duet 3 which isn't necessarily flattering https://www.youtube.com/watch?v=8Ej7DZAK22o. Fair and balanced IMO, but I do mention "warts and all" and it's had 1.4k views to date......

evomotors

@Phaedrux said in Duet3 6CH + 3CH expansion board - Missing steps.:

I am sorry you're having issues. We'd very much like to get to the bottom of it and have a solution for you.

How can I help you to help me?

Phaedrux

@evomotors At this point wait for DC42 to wake up. Time zones and all that.

gloomyandy

@evomotors In the meantime why not make the video that deckingman suggested. That way anyone trying to reproduce the problem you are having can be sure they are seeing the same thing.

dc42

@evomotors, Tony & I are currently investigating a similar issue - which I believe has the same cause - for one of our OEM customers. I hope to make some progress by Monday.