LBT Q 1 2007 Engineering Review HBSC Hydrostatic

LBT Q 1 2007 Engineering Review HBSC Hydrostatic Bearing System 13 -Apr-2007 LBT Q 1 2007 Engineering Review

Highlights (Q 1/2007) n n n Capillaries installed on 4 lateral pads Flexible hoses (safety risk and stiffness reducer) partially eliminated on left-rear laterals “Apparent” reduction at left-rear of telescope Pressure transducers being relocated to pads Initial measurements of lift, and C-ring runout completed Volts. DC under contract and modifying code to correct stow-pin control 13 -Apr-2007 LBT Q 1 2007 Engineering Review

Radial Pad As Designed Modified 13 -Apr-2007 LBT Q 1 2007 Engineering Review

13 -Apr-2007 LBT Q 1 2007 Engineering Review

13 -Apr-2007 LBT Q 1 2007 Engineering Review

Open Issues n Technical n n Schedule n n *Issue* or None Financial n n Control scheme not understood/unknown None Resource n n n Mountain support pacing operation Luciano Miglietta not available for support Network and Firewall communications issues unresolved 13 -Apr-2007 LBT Q 1 2007 Engineering Review

Progress (Q 1/2007) n n Contracted with Volts. DC to modify PLC code and correct Stow Pin issues Completed capillary installation of 2 more lateral pads Hardware and capillaries on hand for installation Completed initial measurements of lift and jitter. 13 -Apr-2007 LBT Q 1 2007 Engineering Review

Planning (Q 2/2007) n n Continue capillary installation of laterals, followed by radials and azimuth replace hoses with hard pipe systematic measurement of lift Volts. DC will install updated PLC code ~2 weeks. 13 -Apr-2007 LBT Q 1 2007 Engineering Review

PLC Programming Goals n n n Communication problem between LBTO computer and HBS-PLC Test and debug Win. CC 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. 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. 13 -Apr-2007 LBT Q 1 2007 Engineering Review

Hydraulic Goals n n n n 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% Reduce system pressure from 120 to 95 bar. Improve the dynamic stiffness of the Lateral bearing by about 500%. Moving the capillaries to the pad and resizing. Eliminating the internal oil return groves. Relocating the return hole. 13 -Apr-2007 LBT Q 1 2007 Engineering Review

13 -Apr-2007 LBT Q 1 2007 Engineering Review

13 -Apr-2007 LBT Q 1 2007 Engineering Review