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Home > Forums > ASTRONOMY > Beginning Astronomy? > Message #836532

Re: barlow basics

Posted by Chris Kelly on 11/13/2017 6:44 AM in response to Re: barlow basics   (64 hits)
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Thanks to everyone for the needed info. I think I have a better grasp now. After some reading I have ruled out playing with the kiln. Porcelain will lose to much surface resolution in the firing. I still couldn't help myself and I spun off a 12" minor parabola on my home lathe. It only cuts to about 100 um and I can now see how much polishing is left after cutting. My bigger machines are tighter but probably not tight enough. I can see were the BIG BOYS have spent their time and money. The toughest part for me was crunching the focal point. I had to pull out my "Little Red Book" to get it close to the length I wanted. Though its going to be more work than I thought I am looking forward to getting it right. Again thanks for all the info.


Subject Posted By Date/Time Hits 
barlow basics Chris Kelly 10/28/2017 5:52 AM 121
Re: barlow basics Ed Blankenship 11/1/2017 9:04 PM 97
Re: barlow basics Ed Blankenship 11/1/2017 9:31 PM 66
Re: barlow basics Chris Kelly 11/2/2017 9:57 AM 87
Re: barlow basics Ed Blankenship 11/5/2017 3:51 PM 71
Re: barlow basics Ed Blankenship 11/5/2017 3:58 PM 80
Re: barlow basics Ed Blankenship 11/5/2017 4:31 PM 73
Re: barlow basics Chris Kelly 11/11/2017 8:19 AM 76
Re: barlow basics Thomas Dey 11/11/2017 4:45 PM 80
Re: barlow basics Chris Kelly 11/13/2017 6:44 AM 64

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