jim.warner@LIGO.ORG - posted 15:44, Friday 09 November 2012 - last comment - 13:10, Monday 12 November 2012(4656)
BSC2 SEI Optical Table Payload issues
HughR, MitchR, JimW Today Team SEI pushed through most of the worst of the seismic optical table payload, but we ran into a couple of known issues. LLO found that these mass stacks somewhat interfere with the BS struts. But where Livingston only had to shift a few 1kg parts around, it looks like we have to move a 5kg mass. In the attached, somewhat cryptic, picture, the mass stack directly under the strut, and closest to the camera, is missing the interfering 5kg mass. We plan on shifting this mass to a neighboring stack, but that does mean the stacks will not be as uniform as on previous units.
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More work was done on the mass stacks today. I decided that shifting one of the stacks a row or two would be less likely to cause problems than adding 5kg of mass to a different stack. This allowed us to put the normal amount of weight on the problem stack, with no risk of hitting other structures. The first couple of pictures are "before"-s showing the interference in more detail. The last one shows the as-installed configuration.
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I forgot to add. There was another stack that interfered with a different strut, but higher up on the stack, so only 1kg needed to be relocated there. See pic.
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