Subject: Fwd: Summer 2001 shutdown

From: Mark Klaene

Submitted: Fri, 24 Aug 2001 16:44:51 -0600

Message number: 516 (previous: 515, next: 517 up: Index)

Below is a list of some of the work accomplished on the 3.5m 
telescope and instruments during this shutdown.  The upcoming nights 
will give us an opportunity to tests the performance improvements 
that some of these items may provide.  The telescope is currently 
ready for on sky engineering tuning and tests, although additional 
daytime engineering is planned for next week.

>
>1. Both enclosure rotation motors were repaired which required 
>replacing bearings and repairing one endplate that was damaged by 
>the brake assembly over the years.
>
>2. The primary mirror was washed
>
>3. The tertiary mirror was re-aluminized
>
>4. UBVR and I filters were added to the guider
>
>5. The rotator wrap was changed to allow +/- 360 deg rotation and 
>make instrument changes easier
>
>6. The guider heat exchanger was serviced and changed to circulate 
>outside air  versus air trapped in the guider box
>
>7. The mirror support system was serviced  fixing air leaks, 
>improved switch over functions to the backup system, checked random 
>bellofram pistons for damage, hardening and corrosion, calibrated 
>the load cells and replaced  transverse amplifier/load cell 
>combination, replaced 1 servo board and added resistors to improve 
>tuneability
>
>8. Inspected primary mirror
>
>9. Installed Printed circuit board for PCB3 on tertiary
>
>10. Repaired tertiary rotation "at slot" sensor
>
>11. Adjusted Echelle focus
>
>12. Adjusted primary mirror vent tubes to provide improved air circulation
>
>13. Replaced casters on GFP instrument cart
>
>14. Serviced telescope azimuth bearing
>
>15. Serviced telescope azimuth moat seal
>
>16. Installed new design for tertiary wiffle which eliminates 1 
>known failure mode, improves maintainability, and installed larger 
>flex pivots providing a slightly stiffer design
>
>17. Evacuated echelle upper tank, Grim2, Dis  and Spicam
>
>18. Rearranged Instrument umbilicals and cleaned up attach points
>
>19. Installed telemetry on elevation and rotator drives and azimuth LVDT
>
>20. Replaced Tycho
>
>21. Installed new TCC version and made some MC software changes
>
>22. Relocated Shak-Hartmann instrument to port MC4
>
>
-- 

Mark Klaene
Observatory Engineer, Deputy Site Manager		voice: 505 437 6822
Apache Point Observatory				fax:   505 434 5555
PO box 59
2001 Apache Point Rd
Sunspot NM 88349

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