Hello, am new here but not a newbie as such.



  • Edit. I appreciate my 4 amp specials are outside of the stock Duet board current supply. Nothing about @Fusedeep suggests particularly high current needs for nema 23s so would expect not to need additional drivers.



  • Of course, you'll get a lot of confirmation bias here, towards Duet, because we all have them.

    Having said that, I wouldn't really consider any other board for my large or sophisticated printers.

    Example: I scratch build a large-ish delta, 600mm Dia, 620 Z, that is now my main workhorse. I wouldn't consider any other controller currently available for that printer. And, I've been very happy with my choice.

    Second example: I'm building a toolchanging printer based on E3D's de-facto standard for tool locking. (See the Jubilee on github)

    I'm installing a Duet 3 on that, even though they are in Beta. At this moment, it has one "base" Duet 3 board, and two "expansion" Duet 3 boards. The ultimate goal is to eliminate the expansions in favor of "tool" boards (as soon as they are released). This expansion/tool thing is all enabled by the CAN bus connections used in the Duet 3 architecture. A tool will have just power and CAN (and a tube with filament); all heaters, fans, sensors, etc are connected to the tool board that is physically local to the tool itself.

    Again, to me, no other choice... these guys are just way ahead of the curve.



  • Thanks Danal, sounds like a useful machine you have there...

    I think my first move is to see if a Duet can run the chunky IGUS gantry. if it can, with or without drivers and a breakout board then all good. 450x500x1800 is still a useful machine

    This may go hand in hand with my polar build. The brilliant David Price did show me some polar work somewhere for Duet. will take another look, as opposed to delta.



  • @FuseDeep said in Hello, am new here but not a newbie as such.:

    Edit. I appreciate my 4 amp specials are outside of the stock Duet board current supply..................

    For info, extract from the Duet Generation 3 hardware overview https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview - quote :

    "Six high-current advanced TMC5160 stepper drivers: SPI controlled will all the latest Trinamic features. Maximum motor current 6.3A peak per phase (4.45A RMS)."

    You didn't mention the mass of your gantry but also for info, I have two gantries on my machine (actually 3 but the 3rd is for load balancing/force cancelling) and on one gantry the moving mass is around 2Kgs, the other is a tad over 3Kgs. I use Nema 17s rated at 2A but running 1.8A on the lighter gantry and Nema 23s rated at 2.8A but running 2.4A on the heavier gantry. Ohh, and I print at up to 300mm/sec with non-print moves at 350mm/sec with that arrangement.



  • Sounds awesome, thanks for the info.

    Honestly, I think it is the ramps board just struggling in general. it never worked properly from day 1 out of vase mode and I have fettled everything 6 times.

    Its a substantial gantry with wide 20mm belts and deep teeth, 2 of those on the Y axis!. think it is just too much for this type of application (It was a gift from IGUS).

    Bearing in mind my use for a classic large XYZ on @FuseDeep and polar use on the new machine (might call that Beverley as it may have a bevelled gear Z drive) which of the duet boards would be most suitable please?

    Want to be able to leave it running standalone and with the screen. reliable and simple to tweak firmware settings is key.

    R



  • @FuseDeep said in Hello, am new here but not a newbie as such.:

    ..................... which of the duet boards would be most suitable please?.....................

    Impossible to say with the limited information provided. You know more about your application than anyone else, so take a look at the specs for each board and see which one will do want you want. Generation 2 is the mainstream product (either wifi or ethernet) generation 3 is more specialised and suited to applications that require a large number of stepper drives (>12) and or higher current ones.


  • administrators

    Can you give more information about this IGUS cantry and the motor(s) you are currently using to drive it?



  • @T3P3Tony

    The original igus steppers were rated at five point something amps. apparently. Its the 600 x 600 room with the very deep top beam:

    I got a lot of conflicting info early on, so swapped them out for some decent regular nema 23.

    Am pretty sure it is just too chunky and have given up on it. I'll try it on a duet and if not swap it for a buzz automation set up. It's wasted too much of my time time at this point tbh.

    Substantially quicker and cheaper to change the gantry than keep chasing my tail. especially now with losing the painful marlin settings.

    R



  • I can't post the url to the gantry as it is flagging as spam. Is there a way round it please?



  • It's an IGUS drylin room gantry 600x600 with some very expensive steppers (330 each remarkably). It can work beautifully but has never liked complex prints.


  • administrators

    weird, posting URLs should work, probably the anti spam being super cautious because you are a new user. try with spaces in the url



  • https://www.igus.

    co.uk/info/drive-technology-drylin-gantries?

    gclid=EAIaIQobChMI48r9pO7a5Q

    IVRLTtCh2PLwnnEAAYASAAEgIIpfD_BwE


  • administrators

    the DLE-RG-0001



  • yes! sorry, should have said.

    h ttp:// shop.3 dfilap rint. com/blog/2017/08/


  • administrators

    annoyingly igus does not provide any information about the stepper motors with encoders used on that gantry. you say you replaced them anyway? what with (model number?)




  • administrators

    @FuseDeep said in Hello, am new here but not a newbie as such.:

    o

    have a look at the specs of thse motors when plugged into the EMF calculator:
    c53747aa-527c-4244-a324-6885c0f07092-image.png

    You will need to put the correct information for your machine in there

    For more info see:
    https://duet3d.dozuki.com/Wiki/Choosing_and_connecting_stepper_motors#Section_Considerations_when_choosing_stepper_motors

    any you can try different values in the tool to see how motor properties effect your maximum speed achievable.



  • I only run at 60 mm/s max as my hot end maxes out then. appreciate acceleration etc is a factor too.

    600x600 is not a particularly big machine imo. fairly sure the gantry is just too meaty for this application.



  • @FuseDeep said in Hello, am new here but not a newbie as such.:

    I only run at 60 mm/s max as my hot end maxes out then. appreciate acceleration etc is a factor too.

    600x600 is not a particularly big machine imo. fairly sure the gantry is just too meaty for this application.

    At over £2k a pop I'd tend to agree. For info, my machine frame is 600 x 600. Although the build plate is 400 x 400 the gantries are 600 x 600 and I just use two 2020 extrusions for X and 4020 for Y. Others have built much bigger machines powered by Duet.


  • administrators

    @FuseDeep said in Hello, am new here but not a newbie as such.:

    These iirc:

    https://www.zappautomation.co.uk/sy57sth76-2004a-nema-23-stepper-motor.html

    Duet Wifi and Duet Ethernet can drive those motors easily. Use 24V power. The maximum speed will be limited to around 150mm/sec (see Tony's post), but from what you have said, that's acceptable to you.

    Duet Maestro is a little under-powered for those motors. Duet 3 would be overkill unless you need the 6th stepper driver or the expandability.


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