LIGO Document E1000301-x0

DCN - HLTS Production Revision Non-Suspended Parts

Document #:
LIGO-E1000301-x0
Document type:
E - Engineering documents
Abstract:
This is a DCN for the production revisions of HLTS non-suspended parts and assemblies.
Files in Document:
None
Authors:
Keywords:
DCN HLTS SUS
Notes and Changes:
Rotational Adjuster:
D1002973-v1: Initial release of HLTS Upper Blade 0.5mm Shim.

Top Blade Guard Assembly:
D070308-v2: Changed Upper Blade stop to 1/4-20 rounded end screw. Added second Upper Blade stop.
D070309-v2: Widened Top Blade Guard Riser for wider Top Blade Guard Bar.
D070310-v2: Widened Top Blade Guard Bar to accommodate 1/4-20 rounded end screw for Upper Blade stop. Added hole for second blade stop. Changed countersunk holes to slots.

Coil Holder Assembly:
D1001754-v1: Initial release of Coil Holder/Upper Mass Assembly.
D070449-v2: Added clearance holes to view top earthquake stops. Revised earthquake stop hole locations and removed lower center crossbrace.
D1002133-v1: Initial release of two-part Coil Holder Mounting Bracket.
D1002134-v1: Initial release of Mounting Bracket Lateral Section.
D1002135-v1: Initial release of Mounting Bracket Longitudinal Section.

Bottom Mass Barrel Earthquake Stops:
D070319-v2: Modified to have shorter mounts and longer crossbar. Mounts now connect to the HLTS Structure using two screws instead of one.
D070321-v2: Lengthened crossbar.
D0901241-v2: Revised to shorten mount and lengthen crossbar. Mount now attaches to HLTS Structure using 2 #8-32 SHCS instead of one 1/4-20 SHCS.

Bottom Mass Lower Earthquake Stops:
D1002821-v1: Initial release. This assembly replaces D080728 to move the earthquake stop outboard and up so that it is outside of the specified aperture oval.
D1002822-v1: Initial release.
D1002823-v1: Initial release.
D1002824-v1: Initial release.

Upper AOSEM Alignment Assembly, Intermediate Mass:
D0902024-v3: Redesigned AOSEM adjustment to act like BOSEM adjustment.
D0902025-v2: Removed one of two vertical slots and shortened remaining vertical slot.
D0901492-v2: Redesigned to replace adjustment screws with adjustment nuts as on the BOSEM. Eliminated one threaded hole to that corresponds with eliminated vertical slot in mounting brackets.
D1002858-v1: Initial release of AOSEM Adjustment Collar (Reverse Side).
D1002865-v1: Initial release of Adjustment Nut, Thick, AOSEM Alignment Assembly. This part is based on D1000660, but is thicker so it can fit into a thicker plate.

Lower AOSEM Alignment Assembly, Intermediate Mass:
D0901493-v2: Removed one of two vertical slots and shortened remaining vertical slot.

Upper AOSEM Alignment Assembly, Bottom Mass:
D0901550-v2: Reshaped bracket to reduce weight.
D0901549-v2: Redesigned to replace adjustment screws with adjustment nuts as on the BOSEM.

Lower AOSEM Alignment Assembly, Bottom Mass:
D0900340-v2: Changed size of slots to mount to structure.

All drawings have already been checked by someone other than the original drafter.

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