hugh.radkins@LIGO.ORG - posted 17:14, Monday 07 March 2011 - last comment - 13:10, Tuesday 08 March 2011(601)
BSC7 HEPI Installation Progress
CoreyG EricA HughR We drilled and Tapped the additional holes needed on the NE Pier at BSC7--pretty straight-forward. We ran into an interference between the HEPI Housing Frame and the Crossbeam Support Bracket. We are making some mods to the latter to deal with that. We got the Housing in place by hanging the Crossbeam from the Crane and then getting the Support Bracket out of the way. We used a 1/2" shim (D030700) between the Crossbeam and the Crossbeam Attach plate. These components where very level wrt each other but we were unable to get all the Pier Mounting hardware installed. So, we bolted the Foot to the Crossbeam and then released the Foot from the Caging Brace; we also released the Springs from the Foot. We then moved the Housing to allow all the Mounting hardware to be installed. Once the Housing was secure to the Pier, the Foot was recaptured by the Caging Brace and then the Springs re-secured to the Foot. The Foot 'Toes' don't have a lot of extra room between the Housing. We got some photos to document this. Tomorrow, Actuators and Stiffeners and Pier #2. 95 to go! Will attach some photos tomorrow.
Attached are photos from yesterday's HEPI work. Tried to measure and take a photo of the HEPI Foot gaps, but it was hard to get a ruler inside the assembly, but hopefully these photographs will offer an idea of what sort of gaps we have. The gap on the right is the one which is closer, and we'll need to be mindful of this offset during any position moves with the assembly.