Haas Automation Inc. used to fine-tune every one of its VF vertical machining centres through a mechanical fore-and-aft loading test, with results entered into the CNC as a compensation value. Recently however, the company began to supplement this test with backlash compensation using Renishaw’s QC10 Ballbar System. By measuring position errors throughout a complete circle, the Ballbar isolates effects often missed by the mechanical test, including the influence of friction, and problems in the motor/ballscrew connection.
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