Mechanisms, Transmissions and Applications by Mehmet Ismet Can Dede Mehmet İtik Erwin-Christian Lovasz & Gökhan Kiper

Author:Mehmet Ismet Can Dede, Mehmet İtik, Erwin-Christian Lovasz & Gökhan Kiper
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

(1)

where, L is a distance between the laser head and the target retroreflector. For instance, when L is 500 mm, an angular motion error of ±5°. (±17.5 Mrad) causes a length measurement error of ±0.75 µm. If a length measurement error within ±0.5 µm is required, the angular motion error must be smaller than ±4.1°.

4 Experiment

4.1 Experimental 2-DOF Parallel Mechanism

To demonstrate the 2-DOF motions and investigate the unfavorable parasitic motion around the laser beam axis during the tilting of the moving platform, an experimental setup of the 2-DOF spatial parallel kinematic mechanism was constructed as shown in Fig. 4. First, a moving platform was mounted on a spherical joint consisting of a steel shank with a 1/2″-diameter steel ball (grade: 28), brass-made holder and a brass-made rid. Three sets of a chain consisting of two steel balls and a permanent magnet link connect the platform to two hand-operated linear stages. Then, two of them set to be parallel to restrict the angular motion around z axis. The stages give the platform two angular motions in α and β directions.

Fig. 4.Two-DOF spatial parallel kinematic mechanism consisting of spherical joint and parallelogram linkage

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