National Institute of Standards and Technology, Acquisition and Assistance Division, Bldg. 301, Room B117, Gaithersburg, MD 20899

66 -- MICROPOSITIONING SYSTEM SOL 53SBNB6C9291 DUE 091296 POC Kathy Lettofsky (301) 975-6342 This Amendment 0001 is made to the action originally publicized in the CBD dated 8/29/96 in order to respond to the following questions: 1) Question: How does the apparatus mount to the external support, and is the external support part of the proposal? Answer: External support is not specified and IS NOT part of this quotation. 2) Question: Does the omega rotator and detector arm assembly rotate about the theta axis? Answer: Yes, the omega rotator and detector arm assembly must rotate about the theta axis. The rotation axes must be concentric to 20 microns at 150 mm above the theta rotator and parallel to 10 arcseconds as stated in the RFQ. The RFQ also states that ALL rotators must be able to be rotated through 360 degrees. 3) Question: What is the precision of the detector arm optical table slide for adjusting the distance between the omega and theta notators. Answer: The detector arm slide must have infinite variability (continuous motion along the slide) with no specification on precision. It is anticipated that a dove tail slide with thumb screw adjustment is required. All other information publicized in the original synopsis remains the same. (0250)

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