Gerardo stated that the Optical Table was not very level using a small T-Level and that the OFI needed adjustment to hang properly after doing all the adjustments on an optical table bench.
So I used the Optical Auto Level to look at the table. With seven shots, above the walls at every corner and in the center of the table, the range of level was +-0.1mm--very level in our books. I did manage to tie it into our LVEA monuments to put an actual elevation on the table: -325.8mm Lz. Adding the -0.3mm conversion from local the global gives -325.8mm Gz (See T1100187.) Looking at D0901129, it shows the Optical table to be 325mm below the BEAM TUBE CL. I can't tell or remember if this is below the HAM5 BT CL or below the BSC2 BT CL where global 0 0 0 is positioned. Either way, we are within 0.5 to 0.8mm of ideal elevation for this Optical Table and again very level. Frankly, I'm relieved! Attached are my field notes.
I've got a couple typo above:
Gerardo stated that the Optical Table was not very level using a small T-Level and that the OFI needed adjustment to hang properly after doing all the adjustments on an optical table bench.
So I used the Optical Auto Level to look at the table. With seven shots, above the walls at every corner and in the center of the table, the range of level was +-0.1mm--very level in our books. I did manage to tie it into our LVEA monuments to put an actual elevation on the table: -325.8 325.5mm[see notes] Lz. Adding the -0.3mm conversion from local the to global gives -325.8mm Gz (See T1100187.) Looking at D0901129, it shows the Optical table to be 325mm below the BEAM TUBE CL. I can't tell or remember if this is below the HAM5 BT CL or below the BSC2 BT CL where global 0 0 0 is positioned. Either way, we are within 0.5 to 0.8mm of ideal elevation for this Optical Table and again very level. Frankly, I'm relieved! Attached are my field notes.