Hi Jason I've seen a fair bit of the casting process elsewhere via a friend. You are fortunate to have such a facility close by. Not having 90 degree angles in the mould is another trick with sand castimg. I had 16"ODx14"OD rings milled at S&S machine (USA) using their cheap 5/8" disc scrap - found that link on the ATM site. The massive Van Slyke secondary focuser/spider I'm using needs a pretty rigid ring. I'm fairly close to having all of the components for the secondary cage. I have a cone shaped secondary baffle design, a bit like Prestons. It seems huge - about 185mm outer diameter, but hard to avoid with a 6" mirror. cheers guy
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