Measuring absolute position and repeatability of rotating axis


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Thread: Measuring absolute position and repeatability of rotating axis

  1. #1

    Default Measuring absolute position and repeatability of rotating axis

    Afternoon team, from all the way over in Dubai!

    I've got a technical question for any experienced guys out there. I'm wondering if you can share advice for measuring conditions relating to an angular axis on a 5 or 6 axis mill. i.e the A, B or C axis. I am trying to find a 'conventional' alternative to purchasing the rather expensive Renishaw XR20 system. I'm not interested in contracting out the maintenance.

    My test equipment includes:

    Precision ground test bar,
    500 x 500mm precision calibration granite block
    Renishaw QC20 ball bar
    Single micron DTI
    Mag stands

    Conditions I can measure with granite, a test bar and DTI:


    • Plane of rotation and parallelism / squareness of that plane to XYZ
    • 0 point of axis
    • Backlash and repeatability of axis.


    However I need suggestions on a proper test method for the following:

    Absolute positioning of axis through full range of motion. Take the C axis for example: C0, C90, C180, C270 are all relatively easy to measure with a test bar. But what if you want to check its positional accuracy at C5, C10, C15 etc?

    Any suggestions would be welcome and bare in mind I am chasing accuracy of around 5-10 micron over say 400mm on the test bar (about 0.0007 deg error) so I'm looking for proper industry tests.

    Thanks in advance guys.

    Scott

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  2. #2

    Default Re: Measuring absolute position and repeatability of rotating axis

    I also have a precision sphere mounted directly to HSK taper.



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Measuring absolute position and repeatability of rotating axis

Measuring absolute position and repeatability of rotating axis