Patrick Waddell, French Leger
Note: this procedure must be updated to include mechanical collimation.
Assumptions for removal:
Pneumatic mirror support is operating and the mirror is stable
Mirror hard points, Galil channels A-D, are at nominal positions for observations
Lateral link drives, Galil channels E & F, are at nominal positions for observations
Install telescope-wind baffle turnbuckles
Pin telescope at horizon, apply telescope altitude and azimuth brakes, depress emergency stop button and disable wind baffle drive
Remove wind baffle (see wind baffle rem. proc.)
Install counterweight mounting blocks to upper wind baffle mount frame
Transfer 1 pair of wind baffle counterweights to upper frame mounting blocks to allow altitude axis motions
Remove remaining 2 pair of wind baffle counterweights
Remove Secondary Truss (see truss rem. proc.)
Remove spectrograph dummy weights
Adjust moveable counterweights to balance
Move wind baffle + telescope to +60 (or so) degrees elevation and disable wind baffle drive
Read and record all 6 M1 linear gauges
Take depth mic readings of M1 from the mirror lifter mic pads
Read and record Gallil position values for channels A-F
Move wind baffle + telescope to zenith "bird bath", install pin, apply telescope altitude brake, depress emergency stop button and disable wind baffle drive
Remove lower light baffle (procedure is TBD)
Install bridge rigging (ladder) on PSS
Remove M1 light baffle
Install plywood cover segment in crane pathway
Install C1 cover
Remove C1
Remove C1 lower mount
Remove plywood cover segment
Remove the perimeter seal and aperture stop
Remove upper earthquake bumpers
Install all 3 segments of plywood cover
Retract M1 transverse hard point / Galil channel D
Wait 5 seconds
Retract (or "home") M1 axial hard points / Galil channels A-C only
Turn off M1 pneumatic support system
Turn off air to lateral link fuses using regulator (not solenoid drive)
Remove transverse hard point assembly
Remove transverse linear gauge
Disconnect lateral links from M1 pads
Remove 2 lateral link linear gauge contact blocks
Install the Hydraset on the crane and lift the spider into position over the M1 lifter
Install central spider into M1 lifter and unbolt lifter from PSS
Install the lifter guide pins
Procedure now requires 4 persons to monitor the position of the mirror and Hydraset gauge level, one person in the center monitoring the mirror, operating the crane
Raise and align the M1 lifter to meet the primary
Lift the primary watching for clearance on all sides...
Once clear of the PSS remove guide pins and attach tag line to M1 circumference
Assumptions for installation:
Pneumatic mirror support is off
Lateral link fuse air regulator is off
Mirror hard points, Galil channels A-D, are at retracted positions (recent "home")
M1 Galil is on (to verify above)
M1 is on lifting fixture (with plywood cover), Hydraset and crane and ready for installation
PSS is turnbuckled to wind baffle
Ensure that PSS is level and pinned at "birdbath" and the wind baffle drive is disabled
Ensure that lateral links are properly positioned to align with M1
Ensure that transverse hard point quill is free and hard point assembly is connected and
ready for installation
Turn on M1 pneumatic support system (support belloframs should stabilize in a retracted state within a few minutes)
Lift M1 off the pedestals
Center M1 over the PSS and remove the M1 tag line
When within 3-4" of PSS install M1 lifter guide pins
Watching for clearance from all sides, and Using plastic M1 centering guides lower M1 near to axial supports
Attach lateral links to M1 pads
Remove plastic guides and slowly turn on air to lateral link fuses using regulator
Reinstall plastic guides and lower the mirror onto axial supports
Lower M1 lifter and connect it to the PSS
Remove M1 lifter central spider and guide pins
Install 2 lateral link linear gauge contact blocks
Install transverse linear gauge
Carefully install transverse hard point assembly
Install C1 lower and upper assemblies
Remove cover of C1
Temporarily remove bridge rigging
Remove plywood cover segments from M1
Install the perimeter seal and upper earthquake bumpers
Install aperture stop
Install M1 baffle
Remove bridge rigging
Drive M1 axial hard points to nominal pos. for obs. / Galil channels A-C only
Drive M1 transverse hard point to nominal pos. for obs. / Galil channel D
Verify M1 support stability
Read and record all 6 linear gauges and compare with earlier measurements
Bring telescope to horizon, pin and disable wind baffle drive
Remove PSS balance weights
Install Secondary Truss
Install wind baffle
Install wind baffle counterweights
