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LBT Q1 2007 Engineering Review

This review highlights significant advancements in the HPSC hardpoints, focusing on a lightweight upper arm constructed from carbon fiber, reducing original weight by approximately one-third. Key improvements include the installation of differential pistons that operate without springs, anti-backlash gear implementation, and modifications to counterweight arms to reduce excess weight. The review also addresses ongoing technical challenges, including backlash issues in the gearbox and limited resources. Upcoming plans involve further testing and refinement of modifications to enhance performance and stiffness.

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LBT Q1 2007 Engineering Review

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  1. LBT Q1 2007 Engineering Review HPSC Hardpoints Study and Rework

  2. Highlights (Q1/2007) • Upper arm lightweighted with Carbon Fiber (weighs ≈ 1/3 the wt. of original) • ‘Differential’ pistons installed and function properly w/o the need for springs • Anti-Backlash gear installed • Modify/removal of primary counterweight arms, removal of more weight • Modified Lower Flexure LBT Q1 2007 Engineering Review

  3. \\lbtdw102.lbto.arizona.edu\Engineering\Thomas' Files\HPTest12072006-Sans--Carbon_AntiT_LowFlex\Fig8.bmp LBT Q1 2007 Engineering Review

  4. LBT Q1 2007 Engineering Review

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  7. Open Issues • Technical • Consistency in testing • Glass safety qualified • Backlash in 50:1 gearbox for stepper motor • Schedule • None • Financial • Unbudgeted • Resource • People • Time very limited LBT Q1 2007 Engineering Review

  8. Progress (Q1/2007) • Have eddy current sensors to replace LVDT’s for testing • Cost for current modifications ≈ $4,000 LBT Q1 2007 Engineering Review

  9. Planning (Q2/2007) • Fabricate another ‘Differential’ Piston set with the appropriate gland widths • Continue stiffness testing, get better stiffness values from measurements • Test with eddy current sensors, instead of LVDT’s • Locate stiffness loss(es), and attempt to increase stiffness • Modify engine stand for gravitational loading/orientation stiffness testing LBT Q1 2007 Engineering Review

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