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| IMACSEngineeringRunJuly04 |
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Grating Tilt Mechanisms
Grating Tilt Mechanism 1 was returned to working order. The home routine and soft and hard limits were exercised and shown to be working as expected. It is recommended that the zero order positions of GTM 1 and 4 be measured and adjusted as/if necessary.
A software issue resulting in DSS configuration errors has been fixed and should be installed and tested when possible.
Disperser Server System
The DSS wheel brake clamp was changed. The clamp air flow control valves were opened. It is possible (and most probable) that low air flow was the cause of the brake release failures experienced in the past.
Z-Axis Motion
The tripod was found to be loose at the pads on the FOS disk. One set of bolts was finger loose and the other was 'wrench' loose. Although it was possible to shake the tripod in the rotation degree of freedom, it was much more restrained in the axial direction. After tightening the bolts the axial runout was measured where a dial indicator was placed near the front west roller. Simultaneous measurements where then taken where dial indicators, separated by approximately 55°-60°, were placed near the rear rollers. In each case the instrument was cycled thru 330° rotations:
Finally, 'change of direction' measurements taken on the forward edge of the MOS rim near the rear west roller showed no evidence of sudden jumps of the instrument in the axial direction at the beginning of rotation as previously observed. In fact, minimal axial motion (±0.002") was witnessed in continuos 5°-10° steps over approximately 30°, including changes in direction. A larger axial motion of approximately ±0.008" was oberserved over a 330° rotation. These results suggest that the forward edge of the FOS rim and rear edge of the MOS rim may not be suitable places to make these measurements and the axial motion should again be measured on the surfaces of the rims that held the fabrication tooling balls, ie. the inside edges (edges that face each other) of the rims.
Rollers
All wipers seemed to be function normally except the top wiper on the rear east roller, which on occasion was found to be pulled further into the roller then designed, when the instrument was rotating in the positive (wrt the NIR rotator) direction.
Wipers
Also, the roller truck were found to be positioned with approximately the correct amount of spacing from their blocks (guaged by eye), again with exception of the upper pivot point of the rear east roller.
Instrument/Carriage Contact
The earthquake clips (both front and rear) were found to contact the instrument at the rubber seals on the panels in two places when rotated through 330°, however the contact didn't appear detremental to the rotation. The rubber seals seemed to lightly brush the clips.
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