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Thread: Squaring shopbot issues

  1. #1
    Join Date
    Aug 2008
    Location
    Cocoa, Florida
    Posts
    190

    Default Squaring shopbot issues

    Doing a little work to check my squareness. Cut a piece 5 X5 and it is square at 7.057 corner to corner both ways. But it is 5.004 front to back and 4.96 side to side . What could be causing this?? any ideas??
    As always thanks for the help.
    Bruce

  2. #2
    Join Date
    Aug 2008
    Location
    Plympton MA
    Posts
    558

    Default

    Bruce,

    If you haven't read Gary Campbell's article on this, I'd recommend it. It's titled 'Tuning Up the PRS Gantry' and is located about 1/4 of the way down this page:

    http://shopbottools.com/garysmusings.htm

  3. #3
    Join Date
    Jul 2006
    Location
    Hendersonville NC
    Posts
    525

    Default

    If your corner to corner measurements are the same I would say your gantry is square.

    I would experiment with making small changes to your X and Y unit values (keep good notes) and see if you can bring the measurements to 5" in both directions. Use the VU command for this.

    Also be sure you're not seeing any bit deflection. Try to do this test with a large diameter bit. I recently did the same test that you did and used a 1/2" downspiral bit with piece of corian I had laying around. Didn't have to worry about any effects due to the grain of the wood.

    Tim

  4. #4
    Join Date
    Aug 2008
    Location
    Cocoa, Florida
    Posts
    190

    Default

    I have found it is the same at several locations on the table x to x .004 short y to y .004 long . Every piece square to with in .001.
    Haven't looked into the unit values yet, Going that way next going to check a couple more little things just to rule out the hardware side before I dive into changing unit values . Anyone have any success with changing unit values and what did you do ?
    Thanks

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