IMACS Engineering Run, May 19-23 2005
- IMACS Engineering Run, May 19-23 2005
- Tasks
- Personnel and Observatory Support Required
- Report
Tasks
Glycol Plumbing
- Install new fittings and hoses on science camera main supply and return and cooling plate lines.
GTM Change Tool
- Test GTM Change Tool functionality - try to remove and install a tilt mechanism using the change tool.
- Develope a procedure for use.
- Incorporate design changes as nedded.
Calibration Lamp Assembly
- Change location of feedthrough slot to the edge of the base plate for easier maintenance.
- Change burnt out lamps.
- Change orientation of baffle for better illumination with continuum.
f/2 Baffle/Stop
- Install new f/2 baffle/stop ring on DSS.
- Fit and test new Hartmann mask.
Miscellaneous Maintenance and Other Work
- SMS Hard Stop Logic
- disable SMS hard stop logic
- Off-Axis Guider Maintenance
- check drive chain tension
- check motion stage 'stiffness'
- Platform Workbench
- work on organizing platform workbench if available.
- Spare Parts
- start work on spare parts catalogue, including lists of what's needed and what's on hand.
- organize and inventory spare parts cabinet.
Personnel and Observatory Support Required
SBS
- Tyson Hare; arrives May 18, 2005, leaves May 24, 2005.
LCO
- Instrument Specialist
- Machinist
Report
Glycol Plumbing
- Installed lines between the camera bulkheads and main supply and return quick connects. This moves the quick connectors off the bulkhead, allowing for the connectors to be easily manipulated and reducing the leakage onto the electronics box. The lines are longer than needed and could be replaced if desired.
- Replaced fittings on the saddlebag cooling plate lines as a demonstration of the proper fittings to be used with tubes. The quick connect assemblies are slightly longer than the previous set up and will be replaced with the smaller, shorter, 'miniature' series.
- All fittings were inspected for leakage, not apparent over an 18 hour period.
- It was suggested that the saddlebag cooling plate be rotated 90 degrees to move the swagelok fittings, providing better clearance for electronics board access.
- It was suggested that the main dewar electronics cooling plates be relocated to the back plate, providing free access to the electronics boards.
GTM Change Tool
- The change tool was tested and a useage procedure was developed, documented, and demonstrated.
- The change tool allows for a safe way to change tilt mechanisms only.
- A simple design modification will be made that would allow for the tool to be used for changing all disperser elements.
- A disperser load function was added to the enggui. Six buttons allow for a 'Disperser Service Position' to be selected. This rotates the DSS so the selected position is in a horizontal orientation when IMACS is also rotated +90 degrees from its home position (save position 4, which can't get horizontal due to rotation limits of the disperser wheel), providing a convenient position to work on a disperser element, allow the change tool to be installed, etc.
Calibration Lamp Assembly
- The Neon lamp was changed.
- A spare NeHg lamp is available. The current NeHg lamp was thought to be burnt out, but in fact the power supply was found to be turned off.
- The assembly base/mounting plate was modified with an additional cable feedthrough slot to allow for easy installation of the unit onto the FOS.
- The shade tilt was adjusted to its forward limit to improve illumination by the continuum source. Although the illumination appears better, further improvement can be gained by moving the lamp forward in the base. This will require a modified lamp mount.
- Several 'snap' exposures were taken with all calibration lamps on the test the shade function. No unwanted light from a calibration lamp was observed.
f/2 Baffle/Stop
- A new baffle/stop ring was installed.
- A new hartmann mask was tested and found to function unsatisfactorily. Tape should be used to fix the mask in place until a more acceptable mask is provided.
Miscellaneous Maintenance and Other Work
- Added labels to clearly identify gratings and tilt mechanisms.
- Panel 10 (midsection) was found with minor damage to the aluminium skin in one corner. The panel was found forced on the wrong way around, thus not seated correctly and the skin was snagged and ripped by the earthquake clip. The torn skin was removed and the exposed insulation was coved with duct tape. Panel 10 is removed to access the f/4 counterweights.
- The SMS hard stop logic was overridden (work completed by E. Cerda). The SMS was exercised without failure.
- Off-axis guiders were inspected and found to be as expected. Drive chain tension was taugh and the mechanism were stiff.
- The f/2 filter server was exercised under both pneumatic control and manual operation and performed as expected.
- A general organization of the IMACS cabinets and dome area was started. The platform workbench storage would help in this effort.
- The IMACS cabinets in the computer room were organized - 3 cabinets seperated into optics, mechanical, and electronics. A general inventory of the optics and electronics cabinets was taken. The mechanical inventory is a larger task to be started on a future engineering run.
General Notes
- Delivered 2 detector focus driver boards (to E. Cerda).
- Delivered 3 spare filter frame assemblies. A total of 6 are available. A production of 20 more is pending.
- Consider a shelving unit to be located in the tunnel for long term, low use items (carriage drive assembly, brass plumbing fittings, spare IGUS links)
- Required Parts
- rolls of tape; Al, duct, gaffer
- M3 x 8 SHCS for filter frame clips
- Future Work
- Glycol Plumbing Revisions
- Change Tool Modifications
- Platform Workbench and associated organization
- Generate a spare parts inventory
- General wiring and plumbing work and rerouting (clean up runs, provide proper anchors, replumb with proper hose/fitting combinations)
acl 2008-11-21
