Ballbar Analysis (Renishaw QC10 Ballbar)What is a Ballbar?
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n circular motion. The Ballbar test will measure any deviation the machine makes from a perfect circle, recording data as the two axes work together. Errors such as backlash, level/squareness, servo mismatch, reversal spikes, vibration, stick slip and other problems can be determined. Users can be useful in determining what feedrate delivers the best accuracy by running the test at different feedrates. A longer length may be used to increase sensitivity to geometry errors, such as squareness; while a very small radius bar may be used to highlight errors such as servo mismatch.Sample Renishaw 5 ballbar Plot
When would I have it done if it were only once??
When the machine is brand spanking new.
That way you have something to compare it to down the road, so you have a map of the machine. Also, if it does find a problem you can go to the dealer immediately and ask them to take care of your problem under warranty.
To view sample Ballbar Plots and analyze the ballbar click here