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    The Development of high-precision hexapod actuators for the Hobby-Eberly Telescope Wide Field Upgrade

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    PN_337_Zierer.pdf (796.1Kb)
    Date
    2010-07
    Author
    Zierer, J.J.
    Mock, J.R
    Beno, J.H
    Good, J
    Booth, J.A
    Lazzarini, P
    Fumi, P
    Anaclerio, E.
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    Abstract
    Hexapods are finding increased use in telescope applications for positioning large payloads. Engineers from The University of Texas at Austin have been working with engineers from ADS International to develop large, high force, highly precise and controllable hexapod actuators for use on the Wide Field Upgrade (WFU) as part of the Hobby Eberly Telescope Dark Energy Experiment (HETDEX)‡. These actuators are installed in a hexapod arrangement, supporting the 3000+ kg instrument payload which includes the Wide Field Corrector (WFC), support structure, and other optical/electronic components. In addition to force capability, the actuators need to meet the tracking speed (pointing) requirements for accuracy and the slewing speed (rewind) requirements, allowing as many observations in one night as possible. The hexapod actuator stroke (retraction and extension) was very closely monitored during the design phase to make sure all of the science requirements could be met, while minimizing the risk of damaging the WFC optical hardware in the unlikely event of a hexapod actuator or controller failure. This paper discusses the design trade-offs between stiffness, safety, back-drivability, accuracy, and leading to selection of the motor, high ratio worm gear, roller screw, coupling, end mounts, and other key components.
    Department
    Center for Electromechanics
    Subject
    Rotating Machine EM Launch
    HETDEX
    HET
    CEM
    hexapod
    actuator
    precision
    pointing
    tracker
    URI
    http://hdl.handle.net/2152/33136
    xmlui.dri2xhtml.METS-1.0.item-citation
    J.J. Zierer, J.R. Mock, J.H. Beno, et al., “The Development of high-precision hexapod actuators for the Hobby-Eberly Telescope Wide Field Upgrade,” paper no. 7733-49, Proc. SPIE Astronomical Telescopes and Instrumentation, San Diego, CA, USA, June 27 to July 2, 2010.
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    University of Texas at Austin Libraries
    • facebook
    • twitter
    • instagram
    • youtube
    • CONTACT US
    • MAPS & DIRECTIONS
    • JOB OPPORTUNITIES
    • UT Austin Home
    • Emergency Information
    • Site Policies
    • Web Accessibility Policy
    • Web Privacy Policy
    • Adobe Reader
    Subscribe to our NewsletterGive to the Libraries

    © The University of Texas at Austin