Constant computer-hardware and software developments have resulted in enhanced requirements for the dimensional accuracy of products. An accurate product reflects the geometrical accuracy of the CNC machine-tool. A quick accuracy test of a CNC machine-tool can be performed with the Ball bar device calibration and parameter correction on the CNC controller can be done with a test-result analysis from the very accurate laser device. The whole machine test and laser calibration according to standards ISO, DIN, JIS, CNS. Straightness, perpendicularity, flatness by laser gauging and circularity by ball-bar test.