This paper summarizes the main aspects of the design and qualification test results of the secondary mirror mechanism
for the VISTA Telescope. A design overview is presented, with detailed description of the main aspects of the system
including the electromechanical part and the control system. Also a description of the test facilities and test
methodologies is provided prior to the presentation and discussion of the performance test results.
This paper summarizes the main aspects of the design and qualification test results of the secondary mirror mechanism for the 10.4-m Gran Telescopio Canarias (GTC). The design of the M2DS consists of a two stage mechanism, a hexapod for alignment using six linear actuators and a compensated tilt/chop stage with three voice coils taking its base on the hexapod mobile plate. The system has been tested after servos adjustment and calibration and the latest results are presented, which illustrate the quality and accuracy of this mechanism in both alignment and chop performances. Finally, the results and experiences are summarized in order to provide useful information for new developments of such systems.