Wooden pattern was made in May for altitude bearings. Single pattern could be used for both sides because diameter piece can be flipped around:
Then we started to try to cast them at Doug's "foundry":
It proved to be a long learning curve but thanks to Doug's persistence both rings were eventually successfully casted in early July, 2002.
Their outside was edged with router to form smooth curve and formica strips were glued to them. Both bearings were then attached to primary mirror box:
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© Jan Wisniewski