-- With Regards, Mel Bartels Programmer/Analyst, and amateur astronomer mailto: mbartels@efn.org homepage: http://www.efn.org/~mbartels How To Computerize A Dob: http://zebu.uoregon.edu/~mbartels/altaz/altaz.html
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- To: owner-atm@shore.net
- Subject: BOUNCE atm@shore.net: Admin request
- From: owner-atm@shore.net
- Date: Sun, 22 Sep 1996 19:20:12 -0400 (EDT)
>From atm-owner Sun Sep 22 19:20:08 1996 Received: from meer.meer.net (meer.meer.net [140.174.164.2]) by relay1.shore.net (8.7.5/8.7.3) with ESMTP id TAA22201 for <atm@shore.net>; Sun, 22 Sep 1996 19:20:07 -0400 (EDT) Received: from theo (theo.meer.net [205.162.2.193]) by meer.meer.net (8.7.3/8.7.3) with SMTP id QAA27227 for <@meer.net:atm@shore.net>; Sun, 22 Sep 1996 16:20:05 -0700 (PDT) Received: (from archer@localhost) by theo (950413.SGI.8.6.12/950213.SGI.AUTOCF) id QAA00750 for atm@shore.net; Sun, 22 Sep 1996 16:20:52 -0700 Date: Sun, 22 Sep 1996 16:20:52 -0700 From: archer@meer.net (Archer Sully) Message-Id: <199609222320.QAA00750@theo> To: atm@shore.net Subject: Help figuring Cassegrain mirror... Hi, I have a 12.5" f/3.96 mirror with a hole already drilled in it. It is around 70% corrected, so it might have been intended for a Dall- Kirkham, but be that as it may, I want to turn it into a full paraboloid. The figure on the mirror does seem to be better at the edge than at the center. I do have to polish around the hole, though, which I think will complicate matters. I already have two laps made (thanks Mark!) one full size, and one 8". So, does anyone have any suggestions for how to approach this figuring job? How is the presence of the hole affect the polishing process? Am I likely to overcorrect, and spend the rest of my life trying to get back to a reasonable figure? Should I be using a sub-diameter tool most of the time, or the full size tool. Any and all advice appreciated. Confusion doesn't phase me ;-). Archer Sully email: archer@meer.net home page: http://www.meer.net/~archer
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