Reports until 14:24, Thursday 06 January 2011
X1 SUS
jeffrey.bartlett@LIGO.ORG - posted 14:24, Thursday 06 January 2011 (454)
Remove Addable Mass from Quad 2 Reaction UI Mass
Mark Barton ran transfer functions for Main Chain and the results are within spec. 

Today we made the following changes to the Reaction Chain: 
(1). Restored the 50g trim masses on the UI mass Top Plate to the design configuration.  
(2). Removed all the addable mass from the UI turrets. The combined weight of the Reaction Chain additional mass and mounting hardware was 563g. To equalize the Reaction UI mass to the Main Chain UI mass, we removed 525g of addable mass, leaving 38g of additional mass. This mass was distributed symmetrically about the top and bottom turrets. 
(3). Reset the UI blade tips to 15mm.
  Note: We replaced one of the blade clamp bolts due to damage to bolt head.
(4). Adjusted the pitch of both chains.
(5). Reset the BOSEMs on the Top Mass to mid-light position. 

Reaction Chain is sitting at 21mm above the LS. Mark will run the transfer functions on the Reaction Chain.