[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [ATM] ? grinding mirror on top

Subject: Re: [ATM] ? grinding mirror on top
From: hermit <hermit@outofoptions.org>
Date: Fri, 06 Apr 2007 15:01:03 -0400
Cc: atm@atmlist.net
Delivered-to: atm_arc@astro.umsystem.edu
In-reply-to: <20070406.144224.2780.0.hrd9@juno.com>
List-archive: <http://www.atmlist.net/pipermail/atm>
List-help: <mailto:atm-request@atmlist.net?subject=help>
List-id: The Amateur Telescope Makers List <atm.atmlist.net>
List-post: <mailto:atm@atmlist.net>
List-subscribe: <http://www.atmlist.net/mailman/listinfo.cgi/atm>, <mailto:atm-request@atmlist.net?subject=subscribe>
List-unsubscribe: <http://www.atmlist.net/mailman/listinfo.cgi/atm>, <mailto:atm-request@atmlist.net?subject=unsubscribe>
References: <20070406.144224.2780.0.hrd9@juno.com>
Sender: atm-bounces@atmlist.net
User-agent: Thunderbird 1.5.0.8 (X11/20061109)

horace r davis wrote:
> I have stop hogging with my 16 inch mirror polishing started with 80 grit
> 4 1/2 hr know 120 grit 1 hr center depth has went from .180 to .193 why
> dose this happen with mirror on top not a problem because I wanted .200
> but would like to under stand why.
>   
There have been discussions about this before.  Mirror on top (mot) will 
deepen the center.   Flip it and you will go the other way.   Why?  You 
could look in the archives.  Always assured to get some conflicting 
'facts'. ;)

Ken Lowther
_______________________________________________
ATM mailing list http://www.atmlist.net/

Follow-Ups:
- Re: [ATM] ? grinding mirror on top
  - From: Ken Hunter <atm_ken_hunter@yahoo.com>

References:
- [ATM] ? grinding mirror on top
  - From: horace r davis <hrd9@juno.com>

Prev by Author: Re: [ATM] No fringes
Next by Author: Re: [ATM] patterns for antique camera focusers
Previous by thread: [ATM] ? grinding mirror on top
Next by thread: Re: [ATM] ? grinding mirror on top
Index(es):
- Author
- Thread