shoshana.apple@LIGO.ORG - posted 09:59, Friday 22 May 2026 - last comment - 13:09, Saturday 23 May 2026(90314)
CRS build continues
[Shoshana, Ryan S] Yesterday we began building the second set of CRSs sent over from LLO (mostly just putting in heli-coils). I (Shohana) will probably continue working on them today For some of the parts sent over from LLO (where they had already gone through clean and bake) we found some black residue in some of the aluminum foil wrappings and on the parts (specifically the cross beams [D2300102] and the solid supports [D2300144]) some of which would come off when wiped, but some of the residue would not. Pictures below
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[Shoshana] Continued LLO CRS build One of the CRS Legs [D2300089 SN016] has a threaded hole on the side where the threads do not go deep enough for a helicoil to be fully inserted, and ends the helicoil up sticking out by ~1/8 inch, meaning half of one of the CRSs cannot be fully built right now unless the hole is tapped deeper a shorter helicoil is used. There were no other issues and 1.5 of the extra CRS supports are built The clean and bake team at Livingston says the residue is just aluminum oxide and not an issue
Which threaded hole is it ?
If the hole depth is correct, but we're just missing the threads on the bottom part of the hole we can tap it with a clean tool.
Alternatively we can also order a 1D helicoil.