May 5, 2004 H.J. Krebs 1

2004 LST Installation Readiness Review

Brass Absorber Production

H.J. KrebsMay 5, 2004

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Brass Absorber

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Brass Absorber

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Brass Absorber Production• Total of 180 brass plates to be produced – includes

spares– Qty 30 10.5”x112.833”x.875” thick– Qty 30 10.5”x106.287”x.875” thick– Qty 30 10.5”x100.650”x.875” thick– Qty 30 10.5”x95.195”x.875” thick– Qty 30 10.5”x90.194”x.875” thick– Qty 30 10.5”x85.193”x.875” thick

• The first 60 brass plates are enroute to SLAC• The remaining plates to be delivered by mid May• Plates require final machining and cambering

– Tapped holes for rigging– Edges rounded– Cambered to remove deflection

• Stainless steel slide angles are in-house

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Brass Cambering Fixture

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Brass Plate Prior to Cambering

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Brass Plate Ready to Be Cambered

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Cambering Process

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Brass Plate After Cambering

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Cambered Brass Plate Creep Test

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Potential Risks• We expect no problems receiving the absorber plates in

plenty of time to perform the final machining and cambering process.

• The final machining process may take longer than expected.– We believe the possibility of this is low.

• It took us 30 minutes to drill and tap the prototype plate and round the edges – 30 min * 180 plates = 90 hours

• We can put more manpower on this if needed.

• The cambering process may take longer than expected and may be more difficult than expected– We believe the possibility of this is low.

• It took us 45 minutes to setup our camber fixture to the appropriate shim configuration and camber one plate

• Subsequent plates could easily be cambered at the rate of 15 minutes per plate – 15min * 180 plates = 45 hours

– A local vendor can camber the plates for us if needed.