Large Binocular Telescope Project

Questions & Answers

concerning the RFP for the

Azimuth Ring and C-Ring Structures

October 17, 1997

Question 1. (received 13 Oct 97)
On the drawings of the C-Ring Structure and the Wind Bracing we are missing dimensions of the welds. Could you please provide information?

Answer 1. The welding modalities (protocols) are reported in section 8.3 of the Technical Specification(s) 401e029 and 401e030. The dimensions of the welds and other details will be fixed on the workshop drawings by the supplier of the structures depending on the welding technology and manufacturing process.

Question 2. (received 13 Oct 97)
Are fillet welds not allowed in the C-Ring Structures?

Answer 2. Fillet welds are allowed in the internal diaphragms. The welds must be done as indicated in the drawings, according to the standards reported in section 8.3 of the Technical Specifications, for those parts where are present mechanical working or force concentrations (i.e. sliding bearing area, connecting flanges between the two supporting arms area, etc.).