584,861 active members*
4,717 visitors online*
Register for free
Login
IndustryArena Forum > OpenSource CNC Design Center > Arduino > Having issues with A4988 + CNC Shield + Arduino Uno + Nema 23 + GRBL
Results 1 to 4 of 4
  1. #1
    Join Date
    Jun 2016
    Posts
    1

    Having issues with A4988 + CNC Shield + Arduino Uno + Nema 23 + GRBL

    Hello All,

    Title lists all the parts i am using for my DIY clone of X CARVE.

    the problem i am having is that the Nema 23 i have bought from ebay rotate too much.
    so i had to change the values of below grbl parameters.

    $100=5.000
    $101=5.000

    and now after that machine runs accurate [ie 100 mm jog means 100 mm in real machine motion][earlier it was 1 mm jog means 50 mm]

    BUT motion became very very slow. that is where i need help.

    One more thing i suspect is that steppers are not getting enough power.
    as they are rated at 2.8A and the drivers can provide max 2A.
    Power supply i am using is 24V 10A (is this enough) for 4 of these steppers.

    PLEASE HELP!!!!

  2. #2
    Join Date
    Feb 2016
    Posts
    381

    Re: Having issues with A4988 + CNC Shield + Arduino Uno + Nema 23 + GRBL

    Your supplying enough voltage theoretically 24v but the drivers are unsuitable, more volts will increase speed and torque most nema 23 will run easilly to 70v and I doubt your providing more than 1/2 the required ampage with your drivers.

    There are CHEAP alternatives like 6560 (will not last 2 mins with incorect wiring connection) or 5 axis Break out Board and 6600 drivers with some wiring protection these tend to be used with Mach3 or LinuxCNC. You will now get advice regarding Gecko and quality drivers etc which likely cost more than your entire system for each but these are the cheaper options. You do not mention intended use or software so more specific information not easy to supply.

  3. #3
    Join Date
    Mar 2006
    Posts
    202

    Re: Having issues with A4988 + CNC Shield + Arduino Uno + Nema 23 + GRBL

    Are there jumpers under the A4988 boards to change the microstepping mode? The default might be 1/32 microstepping, so change the jumpers for 1/16 (double speed) or 1/8 for quadruple speed.

  4. #4
    Join Date
    Dec 2012
    Posts
    199

    Re: Having issues with A4988 + CNC Shield + Arduino Uno + Nema 23 + GRBL

    did your machine move fast with the wrong $100 and $101 settings.
    If so, then you only need to change the corresponding speed settings $110 and $111
    Search for GRBL settings and read that, it will help you.
    As told by Louis Cannell, the drivers you use are not the right ones for these motors. Stay away from the 6560 and go at least for the 6600 types, they are not to expensive and will give a far better result. a 10A power supply will easy do the 4 motors.

Similar Threads

  1. Replies: 4
    Last Post: 03-17-2017, 06:58 PM
  2. Replies: 1
    Last Post: 08-19-2016, 11:57 AM
  3. Arduino Uno + CNC Shield + Nema 17 Stepper + Universal GCode Sender
    By Arduino_Uno_Dyl in forum Open Source Controller Boards
    Replies: 2
    Last Post: 03-02-2016, 04:11 PM
  4. Poor output from Arduino CNC Shield v3
    By mike0866 in forum Arduino
    Replies: 2
    Last Post: 10-13-2015, 06:46 AM
  5. 3020T Arduino + GRBL + CNC Shield V3 Conversion
    By metropolicity in forum Chinese Machines
    Replies: 2
    Last Post: 09-07-2015, 02:42 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •