Duet 3 3.2 Beta2 + SBC jerking motion

fcwilt

Well beta code is expected to behave oddly at times - otherwise it wouldn't be beta would it.

I waited on the move from v2 to v3 until dc42, when asked, felt comfortable saying that 3.1.1 was good.

Frederick

Garfield

A little obvious - I kind of know this - I run beta on purpose in the hope that issues found may assist the team resolve. I'm not asking for a fix hence the FYI - but I am making those that can fix aware so it doesn't end up in a release version.

This is an FYI. Partly in the hope that somebody with a better understanding of the code than me may have ideas that can be explored to detect whatever 'this' is or may be.

Phaedrux

Moved to the beta firmware forum.

Would you be able to share your config.g?

Are you using the Duet 3 in standalone or SBC connected mode?

Can you provide an example of the ripple you mention?

Do you have an example gcode that was able to provoke the violent jolt?

Reporting a problem is helpful, but the more details the better.

SAtech

I have experienced this exact behavior. The print head jerks, almost as if it's skipping a step multiple times mid-print. I am running a duet 2 with SBC on a corexy machine with rrf 3.2-b2 as well.

dc42

@Garfield, are you running your Duet 3 with or without attached SBC?

Garfield

Duet3, attached SBC.

All updates are done via the console of the SBC.

I've attached the config.g but I don't think it adds much - this problem does not exist on 3.1.1 with the exact same file. I verified this behaviour by printing the exact same test piece using the exact same gcode. 3.1.1 does not demonstrate the behaviour.

I didn't keep any pictures of the ripple - I will have to reproduce - I didn't think this was anything other than my problem - reverting the firmware was a last resort, I wasn't expecting the problem to go away.

The test model gcode is too large to upload uncompressed. It is essentially a 5mm thick box, 75mm sides with a 75mm radius on one corner. Be aware though that this prints fine on 3.1.1.

Be aware - this is a gcode file that has been zipped - the extension should be .zip but I couldn't upload that.

wall test.doc

Garfield

I'm going to set up and try to run without the SBC (never done this so result could take a while)

dc42

There are some known issues with Beta2 used with SBC. I suggest you revert to Beta1 until Beta3 is available.

Garfield

Appreciated Dave, I was about to report but have refrained since doing so would have been premature - and the kiss of death.

So far running direct with no SBC and 3.2 b 2 I've had a print running 30 mins or so with zero issues so far.

If you need me to do any testing let me know. I've created a completely new SD card to run local and can easily pop the Pi back on.

Garfield

Said it was the kiss of death ....

So no jolts or odd behaviour - except now the print failed 1hr 14 into the print with Error 1 - Cannot read file.

File reads fine via the Duet GUI, can be downloaded, edited, viewed to the end etc etc
File reads fine with the SD card on the PC - scanned with notepad++ - no defects in file -

I will try again and see if it chokes at the same point.

Garfield

Was just a glitch - file has printed fine now for hours ... all print defects are gone, the jolts are gone with the Pi removed from the equation.

Phaedrux

@Garfield said in Duet 3 3.2 Beta2 jerking motion:

the jolts are gone with the Pi removed from the equation.

Thanks for the confirmation.

tristanryerparke

I had this issue with the Pi4 plus Duet3 on the 3.2 beta as well, went back to the stable to avoid it. Now after upgrading to 3.2rc1 I am still having this "jolting" issue.
I need to run the sbc as ethernet connection is not an option in my workshop.

Phaedrux

@tristanryerparke Can you give some more details about your setup? config.g, etc.

tristanryerparke

Gantry style five axis machine. Nema23 on X,Y. Nema17 on Z,A,B. Duet 3 mainboard and one toolboard controlling the b axis and z probe.
Dual motors for Y axis, auto squaring with U axis.
Config;

;CNC Mode
M453
;Brake Pins
M950 P2 C"out8"
M950 P1 C"out7"
;Drivers
M569 P0.0 S0  I1
M569 P0.1 S0  I1
M569 P0.2 S1  I1
M569 P0.3 S0  I1
M569 P0.4 S0  I1
M569 P121.0 S1 I1
;Driver Mapping
M584 X0.3 Y0.1:0.2  Z0.0  A0.4  B121.0 P5
M584 U0.2 P5
;Current
M906 X2000 Y3750    Z2000 U3750 A1750 B1500 I100
;Microstepping
M350 X16   Y16      Z16   U16   A16 I1 
;Steps Per MM
M92  X80   Y80      Z80   U80  A46.1062140618 B26.6666
;Instantaneous Speed Change
M566 X500   Y500      Z500   U500   A500
;Max Speeds
M203 X13000 Y13000    Z13000 U6000 A40000 B40000
;Max Acceleration
M201 X750  Y750     Z500  U750 A2000 B2000
;Disable Idle Current Reduction
M84 S0    
M917 Y100
;Probe
M558 P9 C"!^121.io0.in" H200 F400 T2000 I1
;Limits
M208 X0    Y-1360 Z-145 A-72000 B-101.4 S1
M208 X1242 Y0     Z0    A72000  B230 S0
;Servos
M950 S3 C"io4.out"
M950 S4 C"io5.out"
;Endstops
M574 U1 S1 P"!io6.in"
M574 Y1 S1 P"!io1.in"
M574 X1 S1 P"io8.in"
M574 Z1 S1 P"io7.in"
M574 A1 S1 P"io0.in"
;Head Endstop
M574 B1 S1 P"121.io2.in"
;Tool 0
M563 P0 S"Probe"
;Tool 1
M563 P1 S"1/4 Flat Brush"
;Tool 2
M563 P2 S"5/8 Flat Brush"
;Allow Movement
M564 S0 H0

Phaedrux

RC2 is now out, can you test with that?

tristanryerparke

@Phaedrux Just tried with RC2, no luck and jerks happen in the same places on same file.

Phaedrux

@tristanryerparke I'm just noticing in your config some rather large spacing between some values. Is that intentional? Can you send M98 P"config.g" to check for errors? Can you send some of those commands like M208 or M201 etc by themselves to see if all of the values for all axis are being set as expected?

tristanryerparke

@Phaedrux yes the spacing was large just for readability/comparing values for axes.
I have removed the spacing so config.g now looks like this:

;CNC Mode
M453
;Name
M550 P"tristan-painting-machine"
;Brake Pins
M950 P2 C"out8"
M950 P1 C"out7"
;Drivers
M569 P0.0 S0  I1
M569 P0.1 S0  I1
M569 P0.2 S1  I1
M569 P0.3 S0  I1
M569 P0.4 S0  I1
M569 P121.0 S1 I1
;Driver Mapping
M584 X0.3 Y0.1:0.2  Z0.0  A0.4  B121.0 P5
M584 U0.2 P5
;Current
M906 X2000 Y3750 Z2000 U3750 A1750 B1500 I100
;Microstepping
M350 X16 Y16 Z16 U16 A16 I1 
;Steps Per MM
M92 X80 Y80 Z80 U80 A46.1062140618 B26.6666
;Instantaneous Speed Change
M566 X500 Y500 Z500 U500 A500
;Max Speeds
M203 X13000 Y13000 Z13000 U6000 A40000 B40000
;Max Acceleration
M201 X750 Y750 Z500 U750 A2000 B2000
;Disable Idle Current Reduction
M84 S0    
M917 Y100
;Probe
M558 P9 C"!^121.io0.in" H200 F400 T2000 I1
;Limits
M208 X0 Y-1360 Z-145 A-72000 B-101.4 S1
M208 X1242 Y0 Z0 A72000 B230 S0
;Servos
M950 S3 C"io4.out"
M950 S4 C"io5.out"
;Endstops
M574 U1 S1 P"!io6.in"
M574 Y1 S1 P"!io1.in"
M574 X1 S1 P"!io8.in"
M574 Z1 S1 P"io7.in"
M574 A1 S1 P"io0.in"
;Head Endstop
M574 B1 S1 P"121.io2.in"
;Tool 0
M563 P0 S"Probe"
;Tool 1
M563 P1 S"1/4 Flat Brush"
;Tool 2
M563 P2 S"5/8 Flat Brush"
;Allow Movement
M564 S0 H0

Running 3.2 stable now and the issue is still happening. M98 P"config.g" runs fine with no errors.
Here is video of one of the clunks:
https://youtu.be/egwhWUq8yAg
As you can see the system is not losing steps, it just stops for a fraction of a second without accelerating/decelerating.
Maybe I should make a new thread for this issue?
Let me know.
Cheers,
T

Phaedrux

@tristanryerparke said in Duet 3 3.2 Beta2 + SBC jerking motion:

Maybe I should make a new thread for this issue?

Is this different than the initial issue?