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Thread: Jerky moves and lost steps

  1. #1
    Join Date
    Jan 2012
    Location
    Minneapolis
    Posts
    27

    Default Jerky moves and lost steps

    Hey Everyone,
    I love my Shopbot buddy and have used it reliably for years but it has become unreliable in the past few weeks. Maybe it's related to an upgrade in control software? I'm using the latest 3.8.36.

    When performing certain moves like clearing pockets, the bot will make sudden, quick, short, harsh moves that cause it to lose position.

    It's best illustrated with this video I shot today.
    https://drive.google.com/open?id=0B1...2RhT3dGN0dEQ3c

    The point at which it makes the clunky move in this file is repeated MOST times it comes to the same spot. It is expanding the offset for a pocket. I have been forced to slow the move speed WAY down to compensate. The video shows the slowed feed rate of 1.5IPS I needed to use to avoid losing steps.

    I have also noticed other odd behavior like moving around corners extremely slowly resulting in burnt wood and cooked bits.

    I am forced to hover and watch the machine like a hawk and it has become entirely unreliable.

    Has anyone else had this same issue? Ramp settings?

    Frustrated.

  2. #2
    Join Date
    Jan 2004
    Location
    iBILD Solutions - Southern NJ
    Posts
    7,986

    Default

    Post up your VR settings.

    ALt + PrtScr the VR sheet, paste into MSPaint and upload.

    There is an outside chance it is doing the "v3.8 crawl", but that was supposed to be fixed in an earlier version than you are running...

    -B
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

  3. #3
    Join Date
    Jan 2015
    Location
    Houston Texas
    Posts
    366

    Default

    That spindle is quiet as hell compared to my router...

    I wonder the total cost for me to switch over to that

  4. #4
    Join Date
    Jan 2004
    Location
    Cleveland TN
    Posts
    369

    Default

    Davo,

    It ain't cheap but so much better, no torque issues, constant power and of course as you say, so much quieter. My first bot had a Porter Cable 3 1/4hp which just screamed so when I bought the one I have now with the 3hp Colombo I can actually talk to my wife while it's cutting. You would not be disappointed.

    Joe
    2005 PRT Alpha 48x96
    2013 Colombo 3hp spindle
    Indexer (converted lathe)
    Aspire 9.0

  5. #5
    Join Date
    Dec 2007
    Posts
    2,383

    Default

    You may want to look into one of the Chinese spindles like this air cooled one

    http://www.ebay.com/itm/FOUR-BEARING...item3f3bf2ef17


    Or this water cooled one I would check to see if it would fit the same mount as your router

    http://www.ebay.com/itm/2-2KW-WATER-...item3aae256060
    they give you the option of more collet sizes

  6. #6
    Join Date
    Jan 2015
    Location
    Houston Texas
    Posts
    366

    Default

    That's cheaper than my router!

  7. #7
    Join Date
    Jan 2012
    Location
    Minneapolis
    Posts
    27

    Default

    Capture.jpg

    Here they are, Brady.

    Greg

  8. #8
    Join Date
    Jan 2004
    Location
    iBILD Solutions - Southern NJ
    Posts
    7,986

    Default

    Somehow your first parameter got jacked...Change it (XY Move Ramp Speed) from .05 to .4

    Your tool will run a little nicer if you change the following:

    3D Ramp Threshold from 100 to 150
    Minimum Distance to Check from .15 to .08
    Slow Corner Speed from 65 to 45

    If you don't want to do any of that, the 'easy button' is to just click on the Reset link at the bottom of the fill in sheet to put them back to stock. My numbers run nicer though...

    -B
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - Vectric Custom Video Training IBILD.com

  9. #9
    Join Date
    Jan 2012
    Location
    Minneapolis
    Posts
    27

    Default

    Thanks Brady. I just changed the settings and will aircut the part again to see the changes in action. BTW, I read your blog post on ramp values in the mean time. Great stuff and worth another link in case it helps someone else with similar trouble to understand what the settings control.

    Here's the link to Brady's blog post.
    http://www.shopbotblog.com/2008/03/a...m-performance/

  10. #10
    Join Date
    Jan 2012
    Location
    Minneapolis
    Posts
    27

    Default

    Works like a charm. Thanks again, Brady.

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