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CNC Shield V3

Discussion in 'Controller Boards' started by Paul Pridday, Jul 30, 2016.

  1. Paul Pridday

    Paul Pridday Journeyman
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    Hey guys. I finally got all my kit together and wired it up. I have the CNC Shield V3 and Arduino Uno, a set of 3 NEMA 23's and 24V power supply. I did up a quick Sketch in Sketchucam and sent it off to the controller. It seemed to be working fine for about 1/2 of the project. (ran for may 20-30 seconds) Then the steppers stopped responding even though the project was still running in the UGS java applet. I checked the heatsinks on the DRV 8825 drivers and they were VERY hot. I decided not to futz with it any more last night. I will pick up a multi meter today and see if the fuse is popped on the Shield. (I'm away at work and in a hotel room. Thus the reason for no tools)

    Any thoughts/direction for this noob to take to start investigating?

    Thanks in advance,

    Paul
     
  2. Wiskerstwo

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    My two cents, is to get a small computer fan to blow over the heat sinks. That solved the identical issue i had.
     
  3. Paul Pridday

    Paul Pridday Journeyman
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    I was eventually going to build an enclosure for both the Uno and CNC Shield with a good size fan on it. I just thought it would last over 20 seconds or so in a 70 degree room... This is with the heatsinks on by the way.

    I picked up a multi meter so will check the stepper driver outputs tonight as per the Polulo videos. It sounds like I should set the voltage about 1.0 volts to get ~2amps to the Nema 23's.

    Thanks,

    Paul
     
    #3 Paul Pridday, Jul 30, 2016
    Last edited: Jul 30, 2016
  4. Wiskerstwo

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    My apologies I read minutes not seconds. And yes 1 volt is good for 2 amps with 8825's.
     
  5. Paul Pridday

    Paul Pridday Journeyman
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    No apologies necessary. I am totally new to this so every little bit helps! :)
     
  6. Paul Pridday

    Paul Pridday Journeyman
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    OK. Set all of my stepper drivers to 1 volt and tried everything again. Ran a sample G code (smiley face) and it ran straight through it. All the motors seemed to be running correctly per the axes movements on the display. Still hot at the heat sinks fairly quickly but upon further reading that may be normal.
    Is it wrong that I got all excited watching stepper motors spin around?? :D

    I'm kind of thinking the last shutdown was probably my sketch that I made. 'Embarrassing'. :duh:

    Now I really want to get home and start my C Beam!!!!!
     
  7. Wiskerstwo

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    That excitement is normal. Glad it all worked out.
     

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