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Re: Focuser For 8" Dall Kirkham Design

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Posted by Robert May on August 3, 1999 02:37:30 UTC

At Riverside Telescope Makers Convention this year Don Clement did just what you need. Lets see if I can describe this quickly. He took 3 flexible hinges (he made the prototype with an old metal tape measure (yo-yo type) for the flexible hinge material) to provide a rigid in most directions but flexible in the in/out direction. The diagram below should illuminate for one of the 3 hinges: *--- moving part / * hinge (3 shown here) --*--- baseplate A screw pushes the moving part up and a spring holds the moving part down. The 3 hinges are of course, set at 120 degrees apart. He didn't have any provision on his proof of design as to aligning the mirror but that's no real problem to put on the moving part with holes through the baseplate. It's a lot better method than that of Meade and Celestron's method of moving the primary.

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