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Missing/Haywire X-Axis at lower speeds

Discussion in 'General Talk' started by Steve B, Mar 15, 2015.

  1. Steve B

    Steve B Veteran
    Builder

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    Below are the first cuts on CNC Jr. on some scrap MDF. The bottom "TEST" is at 500 mm/min, the middle at 200 mm/min and top at 100 mm/min. This is G-Code from F-Engrave, just to test the machine. I used a serif font on the top two to make more steps out of it. The line through the bottom TEST is a lesson in not to use return-to-zero in UGS after a job is done.

    At the lower speeds, it's going haywire. I am thinking this is my X-Axis driver having issues, but it doesn't seem to be overheating once I put a fan on it. I'm using DRV8825's, 12V PS, CNC Shield, GRBL. I have a 24V PS, perhaps I should try that to get the current down?

    Any tips?


    2015-03-15 12.15.01.jpg
     
  2. Steve B

    Steve B Veteran
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    Well, I may have answered my own question... I replaced the driver on the X axis and all is good. I think that I may have had a bad or burnt driver and it wasn't working 100%. New driver works great. Now the trick will be to see how small I can get things to work, and level the machine a little better. There is a fraction of a mm difference from the left side of my bed to the right.


    2015-03-15 14.45.45.jpg
     
    Hytech2k and GrayUK like this.
  3. Tweakie

    Tweakie OpenBuilds Team
    Staff Member Moderator Builder

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    Nice work Steve :thumbsup:

    Tweakie.
     

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