Yesterday I visited the Duet3D booth and had the pleasure to meet the team and have a chat with David and Christian.
It made me realize just how much is going on behind the curtains and how much work and passion those guys are pouring into the development of new features and constant improvement of the overall system.
I am super excited about what's to come.
I hope you guys have a great last day at Formnext!
Max
Good morning!
I know that this has been discussed several times already. I started this thread to collect the available closed loop options for the Duet3.
I have two custom large format printers in the making. One with a build volume of 1000x1000x1000mm for printing architecture models and one with 500x500x1000mm for printing speaker enclosures. With a Build volume this large speed and reliability are essential. Therefore, a closed-loop motion system is a "must have" for my clients.
For the Duet3 I have found the following options:
Duet3 + Duet3 Expansion 1XD + external closed loop stepper drivers that accept step/dir signals
@dc42 I am aware that there is a closed-loop extension board in the making for the Duet3. Is there already a rough estimate on the release date or beta test?
Is there an alternative "of the shelve" closed loop solution available that support the CAN FD protocol?
Cheers,
Max
I would like to use the constant surface speed feature on my Duet based CNC-Lathe.
I am using a generic Haas turning post Processor with some minor adjustments that I have tested with Fusion360 or Solidworks+HSMWorks.
the constant surface speed GCode (G96) is defined on the Haascnc G-Code dictionary as follows:
"G96 commands the control to maintain a constant cutting speed at the tip of the tool. The spindle RPM is based on the diameter of the part where the cut is taking place, and the commanded S value (RPM=3.82xSFM/DIA). This means the spindle speed increases as the tool gets closer to X0. When Setting 9 is set to INCH, the S value specifies Surface Feet Per Minute. When Setting 9 is set to MM, the S value specifies Surface Meters Per Minute.
WARNING: It is safest to specify a maximum spindle speed for the Constant Surface Speed feature. Use G50 to set a maximum spindle RPM. Not setting a limit allows the spindle speed to increase as the tool reaches the center of the part. The excessive speed can throw parts and damage tooling."
Cheers Max
Indeed, I wrote a simple macro that sets the height of the dust shoe to the height of the spindle collet+ the current tool length. This macro is called after a toolchange or if one of the macros for mist cooling or dust extraction is called. Maybe I will add a demon later that updates the height of the dust shoe regularly during a job. But for now this will do.
I made a short video while running a tool change. Not having to fiddle with the dust shoe during toolchanges is already so much more convenient.
And with this start Gcode for PrusaSlicer the correct heightmap is loaded according to the temperature of the printbed.
{if first_layer_bed_temperature[0] <=40}
G29 S1 P"heightmap_roomtemp.csv"
{elsif first_layer_bed_temperature[0] <=70}
G29 S1 P"heightmap_60°.csv"
{elsif first_layer_bed_temperature[0] <=90}
G29 S1 P"heightmap_80°.csv"
{elsif first_layer_bed_temperature[0] <=110}
G29 S1 P"heightmap_100°.csv"
{endif}
Thanks everyone for your ideas and feedback. This is by far more elegant than my original idea. 
@bearer @Phaedrux
I have solved the issue by installing the unstable version (DSF Version: 2.1.3) of Duet Software Framework on Raspberry Pi. and also reverting back to RC11
The guide links to the stable version of the DSF and latest version of the reprap firmware which, at least in my case is not compatible and will lead to the "DCS is unavailable" Error.
cheers Max
Hey @bruce
Thank you so much for developing and sharing your post processor! I use it with the HSM-Works plugin directly in SolidWorks for my duet based CNC Mill.
Any chance to also include a profile for turning as well? I am in the process of converting a Lathe to CNC using a Duet3 6HC board. With lathe support, it would really be the "one post processor to rule them all" 
Cheers Max
@dc42 Thank you for your response.
Yes, I am running RRF 3.4.4 (Sorry, I forgot to mention that!)
With RRF 3.5beta1 on the EXP1HCL, the Y-axis motors now keep their position when closed loop mode is activated. 
With the release of the new Duet 3 Roto Toolboard I am not sure if a new smart effector is really needed. for me the main advantage of the smart effector was nozzle probing. But with the new Scanning Z-Probe Nozzle probing is already obsolete in my opinion. Of course you woul need to set the probe offset manually with a Scanning Z-Probe. To do this I use either a separate button style probe or I adjust the z height manually with baby stepping and run a simple macro to adjust the probe offset by the baby stepping amount and save the new probe offset in config-override.g.
I would still be interested in buying multiple smart effectors if they support the following points. some of them are obvious but for the sake of completeness...
And lastly not necessarily a must but it is nice to have options.
Since I use CPAP style part cooling and watercooling for the hotend I do not require fanports on the tool board. But I recon This would be a no-go for most users.
Just installed your UDL, thank you so much for your work!
-Max
I followed your suggestion and a lookup table to pick the initial potentiometer position and then fine tune the spindle RPM with a loop.
This worked well enough for some initial tests. But for me, it was no satisfying permanent solution.
After taking some voltage measurements, I figured that the motor controller simply needs a 0-5V Control Signal. 
So I used a PWM to analog converter to provide the control signal and to galvanically separate the inverter from the Duet Board.
I am using a multifix toolpost to quickly change between tools. In order to avoid manually calibrating a new tool, I wrote a macro that can automatically set the offsets for a given tool using a touch probe. Since the multifix toolpost is very repeatable, the offsets do not need to be recalibrated after a toolchange.
I am very happy how this project turned out. The Duet3HC is a formidable controller for small CNC-Maschines. 
Video: Paulimot CNC-converion test.mp4
Cheers
Max
@martin7404 said in IDEX motor jitter:
@maxgyver stil.I would like to see your belt arrangment, please
Thank you
I am working from home right now. I will gladly provide you with some CAD-Screenshots of my belt arrangement later this week.
@fcwilt said in IDEX motor jitter:
But why does just the inactive axis vibrate? You mentioned that you can print with one axis without problem - correct?
Have you experimented with changing belt tension?
Frederick
Yes, I have tried every tension from loose to guitar string high.
The big drawback with CORE XY, H-Belt, Markforged e.t.c is that you create a kinematic system where multiple axis are codependent. Meaning that every little tolerance, vibration and over swing, will translate into the other axis. From what I have learned until now, the reduced moving mass is not worth having much longer belts.
That's a very good point.
I am wondering if the effector tilt can be measured and actively compensated by software...but this is probably another topic...
Ball spacing of 70mm between the ball centers should be sufficient for a compact direct extruder. It would need to be raised tough in order to clear the hotend collet. I have also tried fitting other hotends like the Voron-Revo and Pheatus Rapido/Goliath. The Voron-Revo does not work, but the Pheatus Rapido/Goliath might just work. The M3 mounting holes just clear the center hole of the effector, but I recon it will mess with the placement of the strain gauges. The threaded E3D-V6 and E3D-Revo Micro support a large range of hotend combinations. Maybe we should stick with those for the sake of simplicity.
EDIT: and there is also the option to use an adapter like this
E3D Revo-Micro
Top View of the effektor with a sherpa mini
Bondtech LGX Lite
VZ-Hextrudort
EDIT: The Orbiter 2.0 was missing
Okay this is a bit embarrassing, I have three CNC-Machines all with VFD's from differend manufacturers and therefore different manuals. Turns out I was looking at the wrong manual. 
It is all working now . Thank you for your support
@T3P3Tony said in Combined Smart Effector and tool board for delta printers:
@MaxGyver those renders were very helpful. could you do one for the Revo Roto as well?
Of course, I am happy to!
The Revo Roto is a bit longer, so it would have to be rotated by 60°
The setup would be extremely compact.
I have designed a Delta Printer a while back and was basically waiting for a CAN-Smart effector to emerge. So I took the chance to ckeck for any collision points between extruder the Arms (360mm Haydn Magball Arms).
And it looks like the Revo Roto will juuuust fit.
Unfortunately, there is no way to mount the Revo Roto from below trough the effector plate
While installing the Motion Webcam Server Plugin v3.5.0-b1 I got the following error message, although I am running DSF v3.5.0-beta.4. Help would be much appreciated.
I have been using compressed air for hotend and part cooling with great success for over a year now and would like to propose the implementation of means to control things like RC-Servos or Stepper motors or even proportional valves with M106.
Removing fans from the print head comes with a number of advantages like:
reduced bulk
reduced mass
reduced wiring
reduced noise (My airpump provides more than enaugh pressure/airflow for two hotends incl. part cooling for each hotend and is far quiter than any of my previous fan setups.)
no breakdowns due to broken or clogged fans
(Vibrations during printing decreases the fans lifespan and they tend to suck in small parts of filament and get blocked)
far better cooling since cold air from the outside is used instead of hot air rising from the heated bed. -> Cooling performance is independent of the temperature inside the printer.
Further more, the M106 command could be used to open/close ventilation flaps in order to control the temperature in printer enclosures like suggested by @achrn here.
This feature has been requested in different forms a couple of times by now by different users. I have tried everything from rc-servos to proportional valves with limited success due to firmware restrictions See the thread here . Most of the proposed solutions were based on a demon.g doing some kind of conversion. But since RRF version 3.3 the demon.g is only called every 10 seconds, the delay is just to long for responsive cooling.
One suggestion I found very interesting was to call a macro instead of the fan definition in config.g when the g.code contains a M106 command.
-Max
@timschneider Thank you! The Post processor works like a charm right out of the box.
I did reduce the spindle Dwell (G4 S10) time from 10 to 3 Seconds tough. My spindle speeds up quite fast, so 3 seconds is more than enaugh.
In case anyone wants to adjust this as well:
@lirwin17 Wonderful, thanks a lot for your effort and support!
@t3p3tony said in Duet3D 1HCL - Closed Loop Controller Beta test:
Can I just double check you mean 36000mm/s and not either 3600mm/s or 36000mm/m ?36000mm/s would be a "F" parameter of F2160000
Sry rookie mistake! I did indeed mean mm/min and not mm/s 
For CNC-Machines "Ballbars" are used to determine and compensate discrepancies between the software and physical position of a machine. This would be the most accurate way I can think of.