LIGO Document E1200625-v4

local coordinates of support tube ends

Document #:
LIGO-E1200625-v4
Document type:
E - Engineering documents
Other Versions:
LIGO-E1200625-v3
31 Jul 2012, 16:34
Abstract:
The building local coordinates (gravity vector frame) of the centers of the ends of each support tube (for BSC and HAM chambers) are calculated. These values can be used to position (or check) that the support tubes are in the proper locations to place the ISI optics table in the proper location.
Authors:
Notes and Changes:
- Correction to the vertical distance between the HAM support tube centers and the global axes (had previously used the distance from the support tube center to the HAM nozzle B center rather than to the global axis). [Thanks to Celine Ramet for catching this error!]
- Also tables with local coordinates were incorrectly labeled "global".
- Added global and local coordinate tables for all chambers
- Note that there were small discrepancies between the location of the support tube end centers compared to SolidWorks (e.g. LHAM2, D0900365-x094).
a) The vertical distance from support tube center to global axis is 1209.57 mm in SW, whereas in this notebook it was 1209.98 mm. A difference of 0.41 mm. Most of this difference is due to the fact that the SW model has the distance between the support tube center and the nozzle B center as 43.685" whereas this notebook uses the value of 43.70" (a difference of 0.38 mm) from v049-4-128, rev 3, sh1. Since this difference is within the tolerances of the chamber shell, to be consistent with SW, I have changed this dimension to 43.685" (still leaving a difference of 0.02 mm between SW and this notebook).
b) The support tubes in the SW model of LHAM2 (D0900365-x094) are 26.995" and 27.005" laterally separated from the center of the nozzle B center, or 54.000" total. The value for this dimension used in this notebook was 53-15/16" in accordance with PSI v049-4-002, rev 4. Since this difference is within the tolerances of the chamber shell, to be consistent with SW, I have changed this dimension to 54.000".
c) The ends of the support tubes in the SW model of LHAM2 (D0900365-x094) are 47.095" from the center of the HAM chamber. The value for this dimension in this notebook was and remains the same.

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