Back to Home

ATM Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Amateur Telescope Making | Post
Login

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Another Mirror Polishing Question

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Joe/">Joe on April 2, 1999 13:50:59 UTC

I am now polishing my 8" blank. I noticed that the first 1"-1 1/2" of the outside mirror diameter is not being polished as much as the middle portion. It is also evident from the knife edge test when the middle 6" of the mirror is nice and bright but there is about a 2" dark band around the outside. Does this indicate that it is not being properly polished? Maybe the pitch lap has to be reformed using warm pressing?

Thanks, Joe

Follow Ups:

Login to Post
Additional Information
Google
 
Web www.astronomy.net
DayNightLine
About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
Unless otherwise specified, web site content Copyright 1994-2021 John Huggins All Rights Reserved
Forum posts are Copyright their authors as specified in the heading above the post.
"dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
are trademarks of John Huggins