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Talks and Poster Presentations (with Proceedings-Entry):

F. Bleicher, F. Puschitz, A. Theiner:
"Laser Based Measurement System for Calibrating Machine Tools in 6 DOF";
Talk: The 5th Chemnitz Parallel Kinematics Seminar, Chemnitz; 04-25-2006 - 04-26-2006; in: "Parallel Kinematic Machines in Research and Practice", R. Neugebauer (ed.); Verlag Wissenschaftlicher Scripten, Zeickau (2006), ISBN: 3-937524-40-1; 617 - 634.



English abstract:
The scope of this abstract is to give a brief survey of a measuring device which is based on laser interferometry. The system consists of either three or six plan-mirror laser systems and a reflecting reference structure. The laser systems are attached on the moved platform of a machine tool structure preferably clamped in the main spindle. The reference structure is fixed in the workspace and provides three reflecting plan mirrors which are oriented in a Cartesian manner. The structure has to cover the whole workspace envelope. Each reflecting plan mirror is either scanned by one or two laser beams. One laser beam delivers information on a translational deviation referring to a starting position. Using two beams allows determination of the rotational degree of freedom too.

Several advantages can be covered with this measurement device: All degrees of freedom can be measured simultaneously therefore a minimum of measurement time can be achieved. Due to very low weight of those interferometers reduction of moving masses minimizes moments of inertia and eliminates elastic deformations. Avoiding bearings and links between reference- and measurement-device prevents problems regarding stiffness and reduces inaccuracies. At the moment commercially available plan-mirror interferometers can be operated with measuring speeds of up to 1m/s and accuracies, if compensated, of about 1μm with a resolution of 10nm. Main content of this contribution is the comparison of those theoretical principles with practical measurement results by test equipment.

The measuring system can be used for gathering geometric information of the entire workspace of a machine tool, especially for parallel kinematic structures. This information can be processed automatically and either generates a compensation table or identifies geometric parameters of the machine structure, which can be fed back into the machines control. The system might also be used as an In-Process-Measuring device.

Keywords:
Parallelkinematik, Laserinterferometer, Werkzeugmaschinen, Kalibrieren, Messtechnik


Electronic version of the publication:
http://publik.tuwien.ac.at/files/pub-mb_4920.pdf



Related Projects:
Project Head Fritz Bleicher:
EP Kalibriereinrichtung


Created from the Publication Database of the Vienna University of Technology.