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KVN-HGA subreflector hexapod
This type of hexapod controls position and attitude of 20-m class antenna subreflectors. Three units were built and delivered to Antendo Inc. (USA) for the Korea Astronomy and Space Science Institute for their VLBI radiotelescopes network and they are currently in operation. A similar unit has been delivered to High Gain Antenna Co (Korea) to be installed on a 22-m radiotelescope in Korea as well.

Its major features are hereafter summarized:
  • payload = 500 Kg
  • X,Y,Z displacement stroke = +/- 25mm
  • Rx,Ry angular stroke = +/- 1.75 deg
  • stiffness = 220 N/um (axial), 27 N/um (lateral), 95 Nm/asec (tilt)
  • min incremental step = 1,5 um, 1,5arcsec
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