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
Dings, Etc.

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on August 24, 2001 04:44:24 UTC

When you put a chip in a piece of glass, it's wise to go back and use a grinding stone to clean it up and insure that there's no sharp edges. I'd use a 600 grit or finer stone (or you can use some valve grinding compound and a sliver of wood) and clean up the sharp edges. Since it's under the mounting stuff, it won't hurt anything even if it isn't ground smooth although you will have to take care when you disassemble the scope.
Twyman effects will cause the edge of the chip to stand proud by a little bit but that won't be big enough to cause any problems and since it's in the middle, again that will cause no problems.
When you do grind the edges, make sure that you don't scrape some grit or other stuff across the mirror's surface and make a bigger mess of things!!
Next time, take better care of the glass and don't drop things on it or drop the glass itself. Glass is really pretty sensitive to impacts as you have already found out.

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 1994-2020 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