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Old 02-05-2019, 02:50 PM
Billyboy78 (Bill)
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Billyboy78 is offline
Join Date: May 2018
Location: CRESTMEAD Brisbane
Posts: 103
Ellipse done. I used a 4" star lap and worked on the centre zone for about 10 minutes. Knocked up a bench tester to test the 2 focal points and after a bit of messing around got it to work. I had always thought that the secondary radius of curvature and the shorter P focal point were one and the same, and constructed the upper cage to suit. Turns out to be about 100mm shorter, didn't like the cage anyway.

Working to clean up the primary before I can star test.

Last edited by Billyboy78; 02-05-2019 at 03:05 PM.
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