I had a 8" chamber fabricated about 3 weeks ago. The Job consisted of TIG welding the LF200 weld flanges to each hemisphere, boring a hole at the north and south pole and 45 parallel of the sphere, and TIG welding a 2.75" conflat nipple with flange into each hole. Total cost for the work was $200.00 and it took ~4 hrs to do it. I made the welding jig to hold the nipples normal to the chamber during welding to save the welder some work and save me $.
I used a custom medical parts manufacturing company in Minneapolis, (Phelan manufacturing) they were used to working with stainless steel. But any good machine shop or bike frame shop willing to do a small job with capable welders should do. The nitty gritty of flange welding in on another thread ie., the welder will instinctively want to weld on the outside of chamber bad idea. If you are going to farm this out, make sure that you talk to the guy who is doing the welding directly, to make sure that he welds on the INSIDE of the chamber.
Richard Hester has posted the price list and sources for the chamber parts on a previous thread.
Created on Friday, June 08, 2001 4:37 PM EDT by Thomas D Dressel