DCN - HAM Crossbeam Weldment (D080456)

Document #:

LIGO-E0900258-x0

Document type:

E - Engineering documents

Abstract:

DCN for HAM Crossbeam Weldment, describing changes made to prototype design in preparation for Advanced LIGO parts procurement.

Files in Document:

None

Topics:

• Change Control
• Seismic Isolation
• Final Design

Authors:

• Andy Stein

Keywords:

DCN Crossbeam

Notes and Changes:

v2 releases for drawings for the Crossbeam weldment. Changes made since v1 release include:

For all drawings:
1. Using new LIGO drawing formats.
2. Added note for part weight (in pounds).

For D080453:
1. Added fillets to internal edges of pockets.
2. Specified A500 Grade B Steel, instead of 'Low Carbon Steel'.
3. Minor changes to countersink dimensions.
4. Changed details of P/N engraving.
5. Moved 1/4"-20 hole locations, to not interfere with tube radii (see next note).
6. Added radii to long edges within the model, to better reflect true shape of structural tube as it comes from the mfgr.

For D080454:
1. Added chamfers.
2. Specified A36 Steel, instead of 'Low Carbon Steel'.
3. Minor changes to countersink dimensions.
4. Added finish spec (63 um).
5. Added P/N engraving.

For D080455:
1. Added chamfers.
2. Specified A36 Steel, instead of 'Low Carbon Steel'.
3. Minor changes to countersink dimensions.
4. Added finish spec (125 um).
5. Added P/N engraving.

For D080456:
1. Added P/N engraving.
2. Changed paint masking area on Clamp Plates slightly, to reflect the as-built prototype masking area.
3. Added a new isometric view, along with more realistic color assignments, to better communicate the painted vs. non-painted areas.

Referenced by:

• LIGO-D080456-v2: HAM Straight Crossbeam Weldment
• LIGO-D080455-v2: HAM Crossbeam Mounting Flange
• LIGO-D080454-v2: HAM Crossbeam Clamp Plate
• LIGO-D080453-v2: HAM Straight Crossbeam Tube