May 5, 2004H.J. Krebs LST Installation Readiness Review Brass Absorber Production H.J. Krebs May 5, 2004

H.J. Krebs2 Brass Absorber

May 5, 2004H.J. Krebs3 Brass Absorber

May 5, 2004H.J. Krebs4 Brass Absorber Production Total of 180 brass plates to be produced – includes spares –Qty ”x ”x.875” thick –Qty ”x ”x.875” thick –Qty ”x ”x.875” thick –Qty ”x95.195”x.875” thick –Qty ”x90.194”x.875” thick –Qty ”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

May 5, 2004H.J. Krebs5 Brass Cambering Fixture

May 5, 2004H.J. Krebs6 Brass Plate Prior to Cambering

May 5, 2004H.J. Krebs7 Brass Plate Ready to Be Cambered

May 5, 2004H.J. Krebs8 Cambering Process

May 5, 2004H.J. Krebs9 Brass Plate After Cambering

May 5, 2004H.J. Krebs10 Cambered Brass Plate Creep Test

May 5, 2004H.J. Krebs11 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.