LBT Q1 2007 Engineering LBT Q1 2007 Engineering ReviewReview

Primary Mirror CellsPrimary Mirror Cells

13-Apr-200713-Apr-2007 LBT Q1 2007 Engineering RevieLBT Q1 2007 Engineering Revieww

Highlights (Q1/2007)Highlights (Q1/2007)

Cells behaving well, no oscillations this Cells behaving well, no oscillations this winterwinter

SOML Integration contract closedSOML Integration contract closed Walkthrough conducted in January, 100 item Walkthrough conducted in January, 100 item

punch list generated, ~50% completedpunch list generated, ~50% completed Air compressor capacity increased 75% in Air compressor capacity increased 75% in

JanuaryJanuary LBTO staff replaced SX HP-4 2 weeks agoLBTO staff replaced SX HP-4 2 weeks ago SX characterized last SeptemberSX characterized last September DX partially characterizedDX partially characterized

13-Apr-200713-Apr-2007 LBT Q1 2007 Engineering RevieLBT Q1 2007 Engineering Revieww

Open IssuesOpen Issues TechnicalTechnical

Cell Documentation deficient and/or nonexistantCell Documentation deficient and/or nonexistant Hardpoints have lower stiffness that desired, meet 80N/Hardpoints have lower stiffness that desired, meet 80N/mm (min (min

required)required) Air boxes hot, require insulation/cooling Air boxes hot, require insulation/cooling Actuator test stand undocumented/not maintainableActuator test stand undocumented/not maintainable Dew-point of cell compressed air not being monitoredDew-point of cell compressed air not being monitored

ScheduleSchedule NoneNone

FinancialFinancial Cell documentation and test stand upgrade will be cost-plus, Cell documentation and test stand upgrade will be cost-plus,

>$100k>$100k Dew-point monitors ($7 >10k) will be charged to?Dew-point monitors ($7 >10k) will be charged to?

ResourceResource Mountain staff limitations pace work at ObservatoryMountain staff limitations pace work at Observatory J Hill will compute new force distribution matrix this Summer J Hill will compute new force distribution matrix this Summer

(elimination of HP actuators)(elimination of HP actuators)

13-Apr-200713-Apr-2007 LBT Q1 2007 Engineering RevieLBT Q1 2007 Engineering Revieww

Progress (Q1/2007)Progress (Q1/2007)

Cell walk through completedCell walk through completed punch list fixes in progresspunch list fixes in progress LBTO staff replaced SX HP-4 LBTO staff replaced SX HP-4 Compressors upgraded from 30 to Compressors upgraded from 30 to

50hp, air supply is now adequate to 50hp, air supply is now adequate to operate both cells on single operate both cells on single compressorcompressor

13-Apr-200713-Apr-2007 LBT Q1 2007 Engineering RevieLBT Q1 2007 Engineering Revieww

Planning (Q2/2007)Planning (Q2/2007)

LBTO staff will replace first dual actuator 2LBTO staff will replace first dual actuator 2ndnd qtr qtr LBTO staff will diagnose, repair and recalibrate LBTO staff will diagnose, repair and recalibrate

actuator 2actuator 2ndnd qtr qtr SOML will replace puck bonds SX HP-0 and 1 May SOML will replace puck bonds SX HP-0 and 1 May

17-1817-18 ETS has offered project proposal to prepare cell ETS has offered project proposal to prepare cell

documentation (acceptance TBD)documentation (acceptance TBD) ETS to modify hardpoint monitor board (TBD)ETS to modify hardpoint monitor board (TBD) High pressure actuators will be converted to High pressure actuators will be converted to

standard pressure, 3standard pressure, 3rdrd qtr qtr ETS will rework Actuator Calibration Stand (TBD)ETS will rework Actuator Calibration Stand (TBD) Engineering will complete DX characterization Engineering will complete DX characterization

measurements 2measurements 2ndnd qtr qtr