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Optodyne
will present at

the IMTS 2012 Chicago, McCormack Place U.S.A.

September 10 to September 15, 2012

Contact name: Dr. Lily Wang

Telephone: 

(U.S.A.) 310-635-7481


New technique in 3D volumetric positioning error compensation-- Measurement over the part and compensate the G-code
Twenty years ago, the largest machine tool positioning errors are lead screw pitch error and thermal expansion error. Now, most of the above errors have been reduced by better lead screw, linear encoder and pitch error compensation. The largest machine tool positioning errors become squareness errors and straightness errors. Hence, to achieve higher 3D volumetric positioning accuracy, all 3 displacement errors, 6 straightness errors and 3 squareness errors have to be measured. Using a conventional laser interferometer to measure these errors is rather difficult and costly. It usually takes days of machine down time and experienced operator to perform these measurements. Furthermore, high-end controllers, capable of 3D error compensation, are expensive and rare. For these reasons, 3D volumetric calibration has not been widely used.

Recently, Optodyne has developed a new revolutionary laser vector technique for the measurement of 3 D volumetric positioning errors, including 3 displacement errors, 6 straightness errors and 3 squareness errors. All these errors can be measured in a few hours instead of a few days by a conventional laser interferometer. Using this technique, the 3D volumetric positioning errors can be measured and the results can be used to Compensate the 3D volumetric positioning errors through the G-code.

Also, compensate the part program or G-code makes it unnecessary the need of a high-end controller. Hence, a low cost CNC machine can perform as a high cost machine, provide the machine is repeatable. Furthermore, calibrating only part volume allows the collection of more compensation points in a smaller volume, resulting in higher accuracy and less measurement time. This new technique of compensation through G-code will be demonstrated in the WESTEC 2010 (March 23 to 25 at the L.A. Convention Center). The MCV-5002, an efficient and complete laser calibration package for the Aerospace industry will also be displayed.


Westec2010News.doc


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