Cnc breakout board for 4 axis milling machine.



  • Hi, I have a 1.5kw mill running 4x NEMA 34 12nm motors and drives. I really like your platform and was wondering if you have a suitable board for my purpose.

    Regards
    Dave



  • @bigdave

    There is a duet 3 with connections to external drivers planned but has not been released yet.

    The duet 2 family have a breakout board to allow external drives to be connected.

    Or there's the LPC or STM32 ports of the firmware that would allow external drives to be connected. I'm using an SKR Pro with external drives on my printNC build.



  • Thanks Jay, any idea as to when the duet 3 will be released?



  • @bigdave I'm not the best person to ask. Maybe @T3P3Tony can answer?
    I believe it's months though


  • administrators

    @bigdave said in Cnc breakout board for 4 axis milling machine.:

    Hi, I have a 1.5kw mill running 4x NEMA 34 12nm motors and drives. I really like your platform and was wondering if you have a suitable board for my purpose.

    What's the specification of the motors, and what drivers do you currently use? Duet 3 can drive some types of Nema 34 motors directly. OTOH the more expensive external drivers have features like mid-band resonance damping, which Duet 3 doesn't have yet.



  • Hi, this is the detail given by the supplier in the kit.

    1 x Closed Loop Stepper Driver 0-8.5A 20-80VAC/30-110VDC for Nema 34 Stepper Motor
    1 x E Series Nema 34 Closed Loop Stepper Motor 12.0 Nm(1699.68oz.in) Encoder 1000CPR
    1 x 1.7 m(67") Long Encoder Extension Cable for Closed Loop Stepper Driver
    1 x RV-4 AWG18 1.7 m(67") Long Motor Extension Cable with GX16 Aviation Plug
    Motor Specification
    Part Number: 34HE59-6004D-E1000
    Number of phase: 2
    Holding Torque: 12.0 Nm(1699.68oz.in)
    Rated Current/phase: 6.0 A
    Phase Resistance: 0.7 ohms± 10%
    Inductance: 7.9 mH ± 20%(1KHz)
    Frame Size: 86 x 86 mm
    Body Length: 150.5 mm
    Shaft Diameter: Φ14 mm
    Shaft Length: 37 mm
    Keyway Shaft Length: 25 mm
    Lead Length: 300 mm
    Encoder Specification
    Driving Voltage : 5V
    Output current : 55mA
    Resolution : 1000cpr
    Output Signal : 2 Channels
    Bore Diameter : Φ8mm
    Output Frequency : ≤1MHz
    Running Speed : ≤5000rpm
    Driver Specification
    Output Peak Current: 0~8.5A(0~6 RMS)
    Input Voltage: 20~80VAC/30~110VDC (Typical 48/60VDC)
    Logic Signal Current: 7~16mA (Typical 10mA)
    Pulse Input Frequency: 0~200kHz
    Pulse Width: 2.5μS
    Built-in positioning and alarm output for easy detection and control
    Intelligently regulate current, reduce vibration, noise and heat, and increase efficiency by 35%
    With single and double pulse selection function, the factory default is: pulse + direction control
    Excellent high-speed performance and rigidity, perfect combination of servo and stepping advantages
    Connection
    PIN
    1
    2
    3
    4
    Color
    White
    Green
    Blue
    Black
    Motor
    A+
    A-
    B+
    B-

    PIN
    2
    3
    1
    13
    11
    12
    Color
    Red
    White
    Black
    Blue
    Yellow
    Green
    Encoder
    VCC
    EGND
    EA+
    EA-
    EB+
    EB-





  • Also, to clarify my intent.

    I’d like to get a complete kit from you that will allow me to build a multi use control panel that will allow me to move my motors between a number of machines. Mill, lathe, router, 3D printer, scanner ect.

    I’d like to be able to setup machine profiles in the software to drive the different systems.

    I’ve probably gone overkill on the (350w x4), drivers and motors and installed them into a mobile cabinet.

    I’ll be installing breakers, surge protection and line filters into the panel.

    Your system seems to be very intuitive and from what I’ve seen if it could be done then you’d be the people doing it.

    I’m happy to incorporate anything you think appropriate to ensure a good outcome.

    Thanks and regards

    Dave



  • @jay_s_uk

    That’s ok, I’m not in a rush. In the meantime I want to keep building so I’d like engage with you on the rest of the system so I get it right.

    Can that be done offline? It would just be easier is all.

    mccaw.d@gmail.com


  • administrators

    Those stepper drivers need step and direction signals with a minimum signal level of 5V. As we don't yet have a Duet 3 board that supports external drivers, the best solution we can currently offer is Duet 2 WiFi or Duet 2 Ethernet, plus the Expansion Breakout Board.

    We're planning a Duet 3 main board to support external drivers, but it probably won't be available this year.



  • @dc42
    Is the duet 3 capable of driving the motors directly?



  • @bigdave not the ones you've linked to



  • @jay_s_uk
    I still have to install Ballscrews an mount my motors so I might try to wait it out



  • @bigdave said in Cnc breakout board for 4 axis milling machine.:

    Is the duet 3 capable of driving the motors directly?

    Duet3 6HC is rated for 4.45A RMS (6A peak) and the motors are 6A, so you'd not make full use of the motors, but unless the low resistance pr coils is a problem it ought be possible to drive them at 4.45A.



  • Except they have closed loop feedback which couldn't be used, which IMO would be a bit of a waste




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