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### K_MIRROR_TEST

Course: TR 119, Fall 2009
School: University of Hawaii -...
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Word Count: 552

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Testing JACdocs/JCMT/tr/001/119/K_MIRROR_TEST.pdf K-Mirror At UKIRT November 16th through 18th, 2004 Completed by Matthew Doyle, with assistance from Mathew Rippa and Tomas Chylek The orientation used for the tests included a counterclockwise rotation being positive (see Figure 1). An elevation angle of 90 (Figure 1) corresponds to the telescope pointing to zenith. The K-Mirror angle (K) is the angle between the...

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Testing JACdocs/JCMT/tr/001/119/K_MIRROR_TEST.pdf K-Mirror At UKIRT November 16th through 18th, 2004 Completed by Matthew Doyle, with assistance from Mathew Rippa and Tomas Chylek The orientation used for the tests included a counterclockwise rotation being positive (see Figure 1). An elevation angle of 90 (Figure 1) corresponds to the telescope pointing to zenith. The K-Mirror angle (K) is the angle between the plane of symmetry and the ground (-`ve in Figure 1). The other angle of interest (W) is between the plane of symmetry and the worm (+'ve in Figure 1). General Observations Appeared that the shaft supporting the worm may not be correctly aligned. There is some eccentric movement visible on the side opposite the spur gears (whether this is from bearing misalignment or simply an optical illusion is unknown). Test 1 Operational Observations i) Drove mirror at different speeds to observe behaviour. All tests were completed at an elevation angle of 90. Speed ranged from ~0.35/sec to ~5/sec. At speeds less than 1.5/sec there was no noticeable chatter or `bad' noises coming from the drive unit and worm gear. At 1.5/sec, a noticeable noise emitted from the worm gear interaction (chatter?) when rotated in the clockwise direction. At higher speeds, this noise was not as noticeable. All noise did have a cyclic quality, matching the rotation of the drive gear. When an elevation angle was introduced (from 90 to 0), no change was noticeable in the operation of the k-mirror apparatus. Unit operated cleaner (quieter, no visible chatter) at lower speeds. ii) Test 2 Elevation Angle Causing Movement This test involved moving the K-Mirror unit to a specified angle (W), and then rotating the entire assembly (simulating the moving telescope in the elevation angle). The movement of the K-Mirror unit solely due to the change in elevation angle was measured. Two separate trials were completed. The first involved having the K-Mirror set-up as it would be on the telescope, with the drive powered and the friction brakes installed. The second trial focused on the gear train movement, so power to the drive was disabled, and the brakes were removed. Note that a K angle of -90 means that the K-Mirror is orientated with M2 pointing vertical, and a K angle of 0 means that the K-Mirror is orientated with M2 pointing horizontal. Plane of Symmetry Worm Figure 1: K-Mirror with angles of interest 1 JACdocs/JCMT/tr/001/119/K_MIRROR_TEST.pdf i) Drive engaged, brakes installed Drives Powered and Brakes Engaged 0.08 K=-90 0.06 K-Mirror Movement (degrees) 0.04 0.02 0 -150 -0.02 W W W W -125 -100 -75 -50 -25 0 25 = = = = -54.3 -28.6 0.0 26.4 -0.04 -0.06 K (degrees) Figure 2: Results of test i) ii) No Brakes, Drive not powered No Brakes or Drive Pow er 0.12 K=-90 0.1 K-Mirror Movement (degrees) 0.08 0.06 0.04 0.02 0 -150 -0.02 -0.04 -0.06 W = 40.0 W = 0.0 W = -40.0 -125 -100 -75 -50 -25 0 25 K (degrees) Figure 3: Results of test ii) The first observation is that other than the no brake/power test with the K-Mirror at 130.0, the `drift' of the mirror assembly is less than 0.1. Secondly, one can see that there is an imbalance in the unit, which is evident in how the mirror assembly reaches a maximum `drift' and begins returning to the initial point. When the brakes were installed, the `drift' is delayed (comparing the no brake/power @-50.0 to brake and power @-63.6) but the maximum amount appears to be similar. 2
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University of Hawaii - Hilo - TR - 099
DescriptionCOSMOS Name* FPS1 (gravitational) Measure* SI2 (absolute)* MKS3 (gravitational)CGS4 (absolute)LengthX, Y, ZinmcmcmMaterial Properties Elastic Modulus Shear Modulus Poisson's Ratio Mass Density Coefficient of Thermal
University of Hawaii - Hilo - TR - 099
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University of Hawaii - Hilo - TR - 001
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TR/001/18.2/RJSG August 1998 Visit reportVLBA Antenna Operations Centre, Socorro, New Mexico,July 8/9, 1998Justin Greenhalgh, August 4, 1998ContactsI spoke with Paul Rhodes and Jim Oty.General backgroundI was introduced to Paul via the VLBA
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JCMT TR/001/55.0/IPJames Clerk Maxwell Telescope Technical Report No. 55.0 HARP Mechanical CoDR inputIan PainOriginal: 3.Feb.99Joint Astronomy Centre 660 N. A'ohoku Place, University Park Hilo, Hawaii. 96720 USA.JCMT TR/001/55.0/IPHARP Mec
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JCMT Documentation: TR/001/100/TCH (12-Dec-03) Scuba-2 telescope infrastructure conceptual design and analysis.doc Chief Engineer's Message: This note is an introduction to the SCUBA 2 conceptual design study recently completed by the JAC. The study
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JCMT Documentation: TR/001/66/RAL MT ANTENNA DESIGN (Mauna Kea) 1 RAL file number: MM 41CONTENTS: MWT PAPERS- MEETING MINUTES: 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 ASR/MT/T/234/TS: Meeting Held on 22-Dec-81 to Discuss Antenna Backing
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JCMT Documentation: TR/001/63/CDFE INVESTIGATION OF THE BENDING FRAMES FOR THE JCMT PANELS Chris Densham, RAL, 04/03/98 &amp; Other notesCONTENTS: 01 02 03 04 Mike Brown's notes: JCMT corrector frames JCMT Panel Re-measurement - Report Number JCMT/RA
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TR/001/09/PYJames Clerk Maxwell Telescope Technical Report No. 9.0Test Specification for JCMT Azimuth RollerIan Pain Peter YipOriginal: September 11, 1996Joint Astronomy Centre 660 N. A'ohoku Place, University Park Hilo, Hawaii. 96720 USA.
University of Hawaii - Hilo - TR - 049
TR/001/49/RJSG&amp;FB(98)Choice of temperature sensing system for JCMT ASCSJustin Greenhalgh, Fred Baas1 IntroductionThe aim of this paper is to examine the options for improving the temperature sensing at the JCMT. I have drawn on an earlier paper
University of Hawaii - Hilo - TR - 030
TR/001/30/MFJames Clerk Maxwell TelescopeHolography Instructions Mike Fischer February 27, 1998 Version 1.0Holography Instructions 1) Login as &lt;operator&gt;, password &lt;cmsh200&gt; on the Telescope Operator workstation (Digital Screen). 2) It will ask
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University of Hawaii - Hilo - TR - 023
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University of Hawaii - Hilo - TR - 032
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University of Hawaii - Hilo - TR - 051
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WPC?# ##!#MC|NNw YpDPH2E}!U}^,tI[F? '[I3#2H*V# `(mm@T[H#p_Ll#q#0=o0 v1Q#zQ %z5#f7kPJ}Ja`j#H(a~A^Y4#jfdPmqsgc3 Il#9IMt BY#upY+4I#`p333ONH #e0PP5AP=dT;+ #S#e#?L h#dUQb`^l`*Qj#Yo=b\$#YB#p#KF'4Yxe t4&lt;N.}! l#'_#E+M#nZ#U}k&quot;f %6r#WCC=b#p'#dSW#`4#^]D#?#w
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FILENAME tr-001-94-ral_00001.TIFTITLE Millimetre-Wave Telescope Mauna Kea, Hawaii: Mechanical Installation SpecificationAUTHOR Council Works Unit, RALKEYWORD JCMT KEYWORD CAROUSELKEYWORD MECHANICALKEYWORD HISTORICALKEYWORD MWT
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 001
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University of Hawaii - Hilo - TR - 015
In central document store (custody of MKD)
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Page 1MT SOFTWARE STATUS REPORTJAMES CLERK MAXWELL TELESCOPEUnited Kingdom/Netherlands Telescopes Headquarters665 Komohana StreetHilo, Hawaii 96720, U.S.A.JCMT Note MT
University of Hawaii - Hilo - MT - 012
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University of Hawaii - Hilo - MT - 003
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Step Events Page 1MTIN/27.2SCIENCE AND ENGINEERING RESEARCH COUNCIL MTIN/27.2CAVENDISH LABORATORYMULLARD RADIO ASTRONOMY OBSERVATORYMT Project