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

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
RE: Kiln Forming Lenses

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by SteveF on June 7, 2000 01:42:08 UTC

Kevin, 1.625" thick is a good thickness for pyrex disks, but this is on the thin side for a 30" diameter mirror. A 2.125" thick disk would be easier to make for an amateur because it would flex less while grinding and polishing.
Newport Glass Works sells a 30" x 2.125" pyrex disk for $1750, this is the commercial anneal blank. It weighs about 122#.
I tried to email you some information, but it was returned to me. Please email me and I will re-send it.
I`m at


Follow Ups:

    Login to Post
    Additional Information
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2024 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