Deut 3D 6HC questions and Stepper motor match



  • Hello All, I'm new here and have questions. I'm a newbie in this arena. My system will eventually run 6 and later 8 stepper motors. Can the Duet3D 6HC successfully run these motors as shown below? Does it have WIFI? Does it have a something like a touch screen?

    I'm using OpenBuilds NEMA 23 Hi torque motors: Product Specifications
    2 Phase
    Shaft Size: 1/4"
    Torque: 345 oz*in
    Step Angle: 1.8
    4 Wire Bi-Polar
    24-48VDC (Recommended)
    RoHS Compliant
    From the Data Sheet I'm told it shows:
    R=1.2 Ohms
    I= 3.0 Amps
    V= 3.6v calculated
    Further a forum member states: What is the current draw for these motors? 3.6v * 3.0A = 10.8 Watts (calculated) per coil x 2 coils = 21.6 W per motor + 25% overhead for Peak Draw = 27 W per motor. He also says, stepper drivers are not 100% efficient either, so lets add 20 - 30% also (the VM voltage powers the internal circuitry, some losses in switching mosfets burned off as heat, etc.) so lets call it 35W per motor + driver.... So, we have 35W @ 24V = +/- 1.5A x 4 drivers = 6 A @ 24V; 1.5A x 5 drivers = 7.5A @ 24V; and 1.5A x 6 drivers = 9A @ 24 V Will the Duet3D 6HC support 6 of these motors? Your documentation seems to say that you need to use the Raspberry Pi to make a complete system, which Pi model specifically? The photo above shows a device above the main board attached via a broad white connector ribbon? Do I need this to make the system work or to be complete? Do you sell that small board and the ribbon and other connectors needed? In other words, I'm not a computer expert, yet I need to develop a shopping list to build this system. Please help. Thanks, Jim



  • @Jim46 Opps, I forgot to include the the product literature link.
    https://duet3d.dozuki.com/



  • Duet 3 6HC can run with or without a "Single Board Computer" SBC attached. This is almost always a Raspberry Pi when it is chosen. Stand-alone, the Duet 3 6HC is Wired Ethernet only. With the SBC/Pi, it will do whatever a Pi can do... WiFi, mesh, AP, and on and on.

    Pi Model? I wouldn't run with anything less than a 3B+ or a 4B.

    Ribbon is included.

    Stepper choice has a lot more to do with what you want the steppers to drive than it does with the board. Duet can limit current to the motors. Duet 3 6HC can drive about 4 amps per motor with proper cooling. Since a broad industry "rule of thumb" says to drive motors at about 80% of their rating, 5A motors are a good choice. 6A motors are OK as well; again, the board can current limit.

    Duet can run all motors at full current (again, with cooling).



  • There are several choices for screen, and that gets complex fast. I personally choose to run a touchscreen that attaches to the Pi, and run Duet's regular web interface at 3X normal size. Again, there are lots of choices.

    This is the screen I run: https://www.amazon.com/gp/product/B07TXFPHM2/


  • Moderator

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    Can the Duet3D 6HC successfully run these motors as shown below?

    Yes the Duet 3 would be able to handle those motors. Even 6 of them, though you'd probably need to cool the board with a fan.

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    Does it have WIFI?

    The Duet 3 itself does not have wifi. Just an ethernet port. You'd need to use the raspberry pi mini computer to have wifi connectivity.

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    Does it have a something like a touch screen?

    With the Duet 3 you have the option of either using a PanelDue touch screen or if you are also using the raspberry pi you can use a touch screen with that which would give you the full web control interface same as you would get on your computer.

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    Your documentation seems to say that you need to use the Raspberry Pi to make a complete system, which Pi model specifically?

    It's not required, but the Pi opens a few possibilities like plugins, wifi connectivity, full sized touch screen with the full web interface, etc. That said, you can use it without the Pi just as well with a PanelDue.

    At this point a Pi 4 would be the best choice.

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    The photo above shows a device above the main board attached via a broad white connector ribbon? Do I need this to make the system work or to be complete? Do you sell that small board and the ribbon and other connectors needed?

    That would be the raspberry pi. You'd have to provide your own hardware. Duet provides an SD card image to run with it.

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    In other words, I'm not a computer expert

    Perhaps you can explain in more detail what you're trying to build and accomplish and we can give some more feedback about what the best plan of attack would be.

    The Raspberry pi option is definitely more technical in nature than the standalone Duet 3 + paneldue by itself. You could always start with the standalone board and then add the raspberry pi afterwards. It's not an expensive addon.



  • Hi Danal,
    thanks for the comments. From what you say, I should be able to use the DUET3D and the steppers together. What cooling do you recommend. Also, I like the screen reference. I had not seen that model before!
    Cheers, Jim


  • Moderator

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    What cooling do you recommend.

    https://duet3d.dozuki.com/Wiki/Mounting_and_cooling_the_board

    Ideally, mount the board vertically and have a fan blowing across the board surface both front and back.



  • What he said ^^^



  • Hi Phaedrux,
    Thanks so much for your comment. Very helpful!
    Presently, I'm building a 4'x4'x4' XYZ printer with 2 steppers on the vertical (Z) axis, 2 steppers on the back and forth X axis and 1 stepper on the Y axis for head positioning left and right. If possible, I may want to add brakes to the Z Axis to hold the print head level as it could be heavy as the design progresses.
    Cheers,
    Jim


  • Moderator

    @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    I'm building a 4'x4'x4'

    That's a big one! Do keep us posted.



  • @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    Hi Phaedrux,
    Thanks so much for your comment. Very helpful!
    Presently, I'm building a 4'x4'x4' XYZ printer with 2 steppers on the vertical (Z) axis, 2 steppers on the back and forth X axis and 1 stepper on the Y axis for head positioning left and right. If possible, I may want to add brakes to the Z Axis to hold the print head level as it could be heavy as the design progresses.
    Cheers,
    Jim

    Nifty!!

    With no more description than that... we (ok, I) will still have opinions!

    Have you thought about 3 motors on the bed, to enable auto-level?



  • Hi Danal,
    The printer is currently is aimed at large ceramic items. So, I won't have a bed in the traditional sense.
    If none of it works, then it may become a CNC machine.
    J



  • Hi Guys,
    What are your recommendations of the type and wiring for cooling fans for the Duet 3D and the Pi 4?
    Who are the best people to buy and support the Duet3D 6HC ?
    Thanks again,
    Jim



  • @Jim46 said in Deut 3D 6HC questions and Stepper motor match:

    Hi Guys,
    What are your recommendations of the type and wiring for cooling fans for the Duet 3D and the Pi 4?
    Who are the best people to buy and support the Duet3D 6HC ?
    Thanks again,
    Jim

    Assuming the machine is in a "normal office environment" (70 to 80F or 20 to 27C) and not a factory floor:

    Cooling: Mount the board vertically, aim your choice of small fan at the BACK of the board. Almost anything will work, total flow is not at all critical. Duets have "constant on" connectors, so you can pick a more expensive and quieter Noctua, or a generic and replace it when it eats bearings or whatever. Almost any airflow.

    The Pi should not need an active fan.

    Buy and support:

    Direct if that is an option.
    Filastruder in the USA

    Support here. Lots of good stuff from the staff and community both. (I'm community, by the way)



  • Hi Danal,
    Thanks so much. It looks like only the main UK outlet has the Duet3D 6HC. Do you happen to know or have contact that can tell me if the board is the 1.0 Version?
    I placed an order today for the Pi4 and the screen you suggested.
    Next is the Duet3D...
    The help here has been superior!
    Jim


  • Moderator


  • administrators

    E3D sells the Duet 3 MB6HC too.



  • Hello Gentleman,
    Thanks again for sharing and for your great comments. The 7" screen arrived yesterday as did the CanaKit Raspberry Pi 4. Interesting it includes a small fan about 1" square for the Pi4. Yet, having trouble finding a screen case for the Jun-Electon 7" HD HDMI screen? Does anyone know if it fits the RPi4 7" screen case?
    Cheers
    Jim



  • For UK folk I've this screen on my ebay watch list which looks similar, but not identical.

    https://www.ebay.co.uk/itm/264484629064

    Getting a little twitchy about the recommended PSU for the Raspberry Pi 4B being 3A, the screen being 2A, and the max external draw from the Duet3 being 3A, so I've also got a USB current meter on order. Suspect there is head room in both screen and Raspberry Pi advised PSU ratings, but I won't really know what the Pi can draw until I get it slicing and working hard! The draw on the screen shouldn't be much higher than playing some YouTube videos though...



  • @DocTrucker You can always power the RPi from a separate supply if you get desperate.



  • @deckingman I am considering that. Alas it will likely mean a UK socket mounted in the electrickery box, don't fancy trying to wire a USB C plug!



  • @DocTrucker
    Modify the wiring going from duet 3 to the pi. Apply the power to the header rather than using the USB-C



  • @jay_s_uk fair shout! 🙂



  • @DocTrucker For info, I haven't used the ribbon cable from the Duet to the RPi. Just connected the data pins and a couple of gnds. Then used an external 5V psu to power the RPi etc. Having said - I've now disconnected it and the RPi just sits there unconnected waiting for someone to come up with something useful for it to do. ☺



  • I'm running the Ribbon D3>Pi. I'm running a 7" touchscreen, and a camera. The camera has been swapped several times (experimenting with tool-to-tool alignment). At the moment it is a Logitech C270. It has been a 'microscope' with its own LED ring illuminators around the lense.

    No signs of power stress. Have printed for 5 and 10 hours at a time, toolchanging all the way...


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