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MEASUREEMENT AND COMPENSATION FOR |
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GEOMETRICAL AND POSITIONING ERRORS IN ALL THE WORKING VOLUME OF A |
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LARGE DIMENTION GANTRY MACHINE |
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| Gianmarco Liotto |
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Optodyne Laser Metrology SRL |
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Via Veneto,5
20044-Bernareggio (MI ) |
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| Abstract |
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| Reduction of the positioning errors in the complete working volume of a machine tool of large dimension using the volumetric compensation and the accuracy check by the body diagonal positioning measurements. | ||
| Scope |
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| The scope of testing is the verification of the possibility of the compensation of a large dimension machine tool, in all the degree of freedom made possible by the used CNC, Fanuc 18i, in economically affordable time. The tested machine is CMC model REX with a working volume of 200 cubic meter wit diagonal elongation of 5,5m (18,5ft ). The test is characterized of three phases: La prova č stata caratterizzata da 3 fasi: | ||
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| The measurements of diagonal positioning error, or volumetric error, have been performed following the recommendation of the standard UNI –ISO 230-6 (ASME B5.54) for a quick check on volumetric performances. The error along the diagonal is sensible to the errors in the three orthogonal directions. The laser is positioned in one of the volume corners and aligned along the diagonal to reach the opposite corner. The machine is programmed for a coordinate movement of all the axes along the diagonal and the positioning error along the diagonal have been collected. |
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