tridob : Making trilateral telescopes

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This group is for those who are interested in building trilateral Dobsonian telescopes.

Re: The Reason Behind a 90 Degree Mirror Edge Support? Hi Furt "If Dale Eason hadn't pointed me in the right direction I'd still be trying to polish out the astigmatism, which was never there!" I seriously doubt Posted - Wed Jan 25, 2012 3:06 pm	Art Bianconi artbianconi Offline Send Email
Re: The Reason Behind a 90 Degree Mirror Edge Support? I too was amazed at how important edge contact position is. I look at my 18" mirror and think how could anything that thick twist? But it did. If Dale Eason Posted - Wed Jan 25, 2012 11:35 am	Furt gregfurtman Offline Send Email
Re: The Reason Behind a 90 Degree Mirror Edge Support? It never occured to me until now how important it is that the support bolt be tangential for the entire edge of the mirror. It never used to be important until Posted - Wed Jan 25, 2012 11:27 am	Art artbianconi Offline Send Email
Re: The Reason Behind a 90 Degree Mirror Edge Support? Art, My mirror is 1.625" thick. So the center of mass would be a little less than half of that from the back side. Since the front half of the mirror is Posted - Fri Jan 20, 2012 2:27 pm	Furt gregfurtman Offline Send Email
Re: The Reason Behind a 90 Degree Mirror Edge Support? Hello Greg! When you say make sure that they are touching the mirror at the center of mass. what does that mean? took off some metal except at the center of Posted - Fri Jan 20, 2012 2:22 pm	Art Bianconi artbianconi Offline Send Email
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