LBT Q Engineering Review HBSC Hydrostatic Bearing System

13-Apr-2007LBT Q Engineering Review Highlights (Q1/2007) Capillaries installed on 4 lateral pads Capillaries installed on 4 lateral pads Flexible hoses (safety risk and stiffness reducer) partially eliminated on left-rear laterals Flexible hoses (safety risk and stiffness reducer) partially eliminated on left-rear laterals “Apparent” reduction at left-rear of telescope “Apparent” reduction at left-rear of telescope Pressure transducers being relocated to pads Pressure transducers being relocated to pads Initial measurements of lift, and C-ring runout completed Initial measurements of lift, and C-ring runout completed VoltsDC under contract and modifying code to correct stow-pin control VoltsDC under contract and modifying code to correct stow-pin control

13-Apr-2007LBT Q Engineering Review Radial Pad As Designed Modified

13-Apr-2007LBT Q Engineering Review

13-Apr-2007LBT Q Engineering Review

13-Apr-2007LBT Q Engineering Review Open Issues Technical Technical Control scheme not understood/unknown Control scheme not understood/unknown Schedule Schedule *Issue* or None *Issue* or None Financial Financial None None Resource Resource Mountain support pacing operation Mountain support pacing operation Luciano Miglietta not available for support Luciano Miglietta not available for support Network and Firewall communications issues unresolved Network and Firewall communications issues unresolved

13-Apr-2007LBT Q Engineering Review Progress (Q1/2007) Contracted with VoltsDC to modify PLC code and correct Stow Pin issues Contracted with VoltsDC to modify PLC code and correct Stow Pin issues Completed capillary installation of 2 more lateral pads Completed capillary installation of 2 more lateral pads Hardware and capillaries on hand for installation Hardware and capillaries on hand for installation Completed initial measurements of lift and jitter. Completed initial measurements of lift and jitter.

13-Apr-2007LBT Q Engineering Review Planning (Q2/2007) Continue capillary installation of laterals, followed by radials and azimuth Continue capillary installation of laterals, followed by radials and azimuth replace hoses with hard pipe replace hoses with hard pipe systematic measurement of lift systematic measurement of lift VoltsDC will install updated PLC code ~2 weeks. VoltsDC will install updated PLC code ~2 weeks.

13-Apr-2007LBT Q Engineering Review PLC Programming Goals Communication problem between LBTO computer and HBS-PLC Communication problem between LBTO computer and HBS-PLC Test and debug WinCC Engineering override code on LBTO Computer Test and debug WinCC Engineering override code on LBTO Computer Cannot read the status of the stow pins and stow pin proximity switches when in local or remote mode on the SCP. Cannot read the status of the stow pins and stow pin proximity switches when in local or remote mode on the SCP. PLC does not properly command the stow pins to move. PLC does not properly command the stow pins to move. PLC needs to ignore stow pin SCP commands when the SCP is in remote mode. PLC needs to ignore stow pin SCP commands when the SCP is in remote mode.

13-Apr-2007LBT Q Engineering Review Hydraulic Goals Cut the oil flow, cooling and power to the bearings by more than half. Cut the oil flow, cooling and power to the bearings by more than half. Improve the static stiffness of the bearings by at least 10% Improve the static stiffness of the bearings by at least 10% Reduce system pressure from 120 to 95 bar. Reduce system pressure from 120 to 95 bar. Improve the dynamic stiffness of the Lateral bearing by about 500%. Improve the dynamic stiffness of the Lateral bearing by about 500%. Moving the capillaries to the pad and resizing. Moving the capillaries to the pad and resizing. Eliminating the internal oil return groves. Eliminating the internal oil return groves. Relocating the return hole. Relocating the return hole.

13-Apr-2007LBT Q Engineering Review

13-Apr-2007LBT Q Engineering Review