1. LBT Q2 2007 Engineering Review Swing Arms (SWA)

2. 10-Jul-2007LBT Q2 2007 Engineering Review Highlights (Q2/2007) The right secondary arm is wired and the preload set The right secondary arm is wired and the preload set The left secondary swing arm is wired, but not tested The left secondary swing arm is wired, but not tested

3. 10-Jul-2007LBT Q2 2007 Engineering Review Open Issues Technical Technical Repeatability measurement Repeatability measurement Vibration measurement Vibration measurement Shock Absorbers Shock Absorbers Schedule Schedule Prime Focus Swing Arm Commissioning Plan Prime Focus Swing Arm Commissioning Plan Financial Financial None None Resource Resource Mountain manpower availability Mountain manpower availability Chamber lift shortage Chamber lift shortage With time on the telescope so precious, it makes sense to have another scissors lift so multiple tasks can be accomplished With time on the telescope so precious, it makes sense to have another scissors lift so multiple tasks can be accomplished

4. 10-Jul-2007LBT Q2 2007 Engineering Review Progress (Q2/2007) From Planning at last review From Planning at last review Come up with a Prime Focus SA Commissioning Plan Come up with a Prime Focus SA Commissioning Plan Not done Not done AS Swing Arm Preload & Alignment AS Swing Arm Preload & Alignment DX done, SX delayed due to wiring delays and telescope scheduling DX done, SX delayed due to wiring delays and telescope scheduling Primary Mirror Cover Test Fit #3 Primary Mirror Cover Test Fit #3 Cancelled Cancelled Remove SX M3 SA (clean bearings while it is off) Remove SX M3 SA (clean bearings while it is off) Not necessary due to cancellation of Mirror Cover Test Fit. Bearing replaced while arm on the telescope Not necessary due to cancellation of Mirror Cover Test Fit. Bearing replaced while arm on the telescope GUI testing GUI testing Initial testing carried out on prime focus swing arms Initial testing carried out on prime focus swing arms Wired Secondary Swing Arms Wired Secondary Swing Arms Resolved loose brace issue on DX M3 SA – the arm twists when there is no dummy or M3 unit installed Resolved loose brace issue on DX M3 SA – the arm twists when there is no dummy or M3 unit installed Matt Stohr working on shock absorbers Matt Stohr working on shock absorbers Prefab cables and plates for SX Tertiary completed & delivered to mountain Prefab cables and plates for SX Tertiary completed & delivered to mountain

5. 10-Jul-2007LBT Q2 2007 Engineering Review Planning (Q3/2007) Come up with a Prime Focus SA Commissioning Plan Come up with a Prime Focus SA Commissioning Plan Repeatability Repeatability Vibration Vibration Deploy/retract speed Deploy/retract speed SX AS Swing Arm Preload SX AS Swing Arm Preload SX M3 Swing Arm Preload SX M3 Swing Arm Preload Finish Shock Absorber Design Finish Shock Absorber Design More GUI testing More GUI testing