owner-atm@shore.net wrote: > >From atm-owner Sat Jul 18 00:08:17 1998 > Received: from mermaid.shore.net (mermaid.shore.net [207.244.124.6]) > by aquarium.shore.net (8.8.7/8.8.7) with SMTP id AAA07730 > for <atm@mlist.shore.net>; Sat, 18 Jul 1998 00:08:17 -0400 (EDT) > Received: from mail.hot1.net (newman.hot1.net) [206.242.204.7] (root) > by mermaid.shore.net with esmtp (Exim) > id 0yxON2-0006eF-00; Sat, 18 Jul 1998 00:13:16 -0400 > Received: from hot1.net (dialup-54.hot1.net [206.242.204.154]) by newman.hot1.net >(8.8.7/8.7.3) with ESMTP id XAA00184 for <atm@shore.net>; Fri, 17 Jul 1998 23:13:13 >-0500 > Message-ID: <35B023A3.ADF216EC@hot1.net> > Date: Fri, 17 Jul 1998 23:25:09 -0500 > From: Michael Robinson <thomrob@hot1.net> > X-Mailer: Mozilla 4.05 [en] (Win95; I) > MIME-Version: 1.0 > To: atm@shore.net > Subject: Huge central hill > Content-Type: text/plain; charset=us-ascii > Content-Transfer-Encoding: 7bit > > I in in the late polishing stage of a 10" f/6 project. After many hours > of polishing TOT (In an attempt to avoid TDE) I am left with a a central > hill the size of Mt. Everest. > > I have been doing unmasked Foucault tests throughout the polishing and > all that TOT has > contributed to the hill. My first ( and latest) Foucault masked reading > #'s are: > > Zone 1....4.41 > Zone 2....4.23 > Zone 3....4.16 > Zone 4... 4.21 > > Mask has a 2" diameter closed center w/ zone 1 starting there. Rest of > mirror looks OK except I suspect a 1/16 to 1/8 TDE (revealed through > ronchi test). > > The Question: Should I go with (A) MOT using a conservative 1/3 W stroke > to gradually bring Mt. Everest (central hill) down? or (B) go with more > aggressive MOT as in > long parabolizing strokes or (C) some other option? > > I've gone the CeOx route and have done serious polishing for about 9 > hours. > > This is my second telescope. My first was a 6" f/8. > > This and any other advice would be appreciated. > > Thanks, > > Mike Robinson > Waco, Texas
-- BEGIN included message
- To: owner-atm@shore.net
- Subject: BOUNCE atm@shore.net: Non-member submission from [Michael Robinson <thomrob@hot1.net>]
- From: owner-atm@shore.net
- Date: Sat, 18 Jul 1998 00:08:21 -0400 (EDT)
>From atm-owner Sat Jul 18 00:08:17 1998 Received: from mermaid.shore.net (mermaid.shore.net [207.244.124.6]) by aquarium.shore.net (8.8.7/8.8.7) with SMTP id AAA07730 for <atm@mlist.shore.net>; Sat, 18 Jul 1998 00:08:17 -0400 (EDT) Received: from mail.hot1.net (newman.hot1.net) [206.242.204.7] (root) by mermaid.shore.net with esmtp (Exim) id 0yxON2-0006eF-00; Sat, 18 Jul 1998 00:13:16 -0400 Received: from hot1.net (dialup-54.hot1.net [206.242.204.154]) by newman.hot1.net (8.8.7/8.7.3) with ESMTP id XAA00184 for <atm@shore.net>; Fri, 17 Jul 1998 23:13:13 - 0500 Message-ID: <35B023A3.ADF216EC@hot1.net> Date: Fri, 17 Jul 1998 23:25:09 -0500 From: Michael Robinson <thomrob@hot1.net> X-Mailer: Mozilla 4.05 [en] (Win95; I) MIME-Version: 1.0 To: atm@shore.net Subject: Huge central hill Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit I in in the late polishing stage of a 10" f/6 project. After many hours of polishing TOT (In an attempt to avoid TDE) I am left with a a central hill the size of Mt. Everest. I have been doing unmasked Foucault tests throughout the polishing and all that TOT has contributed to the hill. My first ( and latest) Foucault masked reading #'s are: Zone 1....4.41 Zone 2....4.23 Zone 3....4.16 Zone 4... 4.21 Mask has a 2" diameter closed center w/ zone 1 starting there. Rest of mirror looks OK except I suspect a 1/16 to 1/8 TDE (revealed through ronchi test). The Question: Should I go with (A) MOT using a conservative 1/3 W stroke to gradually bring Mt. Everest (central hill) down? or (B) go with more aggressive MOT as in long parabolizing strokes or (C) some other option? I've gone the CeOx route and have done serious polishing for about 9 hours. This is my second telescope. My first was a 6" f/8. This and any other advice would be appreciated. Thanks, Mike Robinson Waco, Texas
-- END included message