LIGO Document D1500163-v3
- Redesigned End Reaction Mass (ERM) with Dia. 200 mm hole in center
- Revised as follows:
NOTE NO. 3 WAS:
INSPECTION POLISH ALL FACES, EDGES AND CHAMFER.
SURFACES SHALL APPEAR TRANSPARENT WITH NO GREY, SCUFFS OR
SCRATCHES VISIBLE TO THE NAKED EYE WHEN VIEWED IN NORMAL
ROOM LIGHT AGAINST A BLACK BLACKGROUND.
NOTE NO. 4 WAS:
ETCH, GRIND OR SANDBLAST THE SERIAL NUMBER "ERM X", APPROX.
WHERE SHOWN, LETTERING APPROX. 4mm HIGH, WHERE "XX" IS
INCREMENTAL STARTING WITH "11".
ADDED NEW NOTES NO. 6-8
F/D:
ZONE D/4: Change chamfer tolerance, WAS 2.0 ± 0.2 x 39deg ±5. Also changed (39deg) call-out to ( 41 deg).
Zone F/5: Center void diameter WAS: 200 DIA. IS: 222.5 ± 0.25 mm with similar Cyl. & Perp. as OD (340mm)
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