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
Secondary?

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on October 7, 2001 02:44:51 UTC

It's quite possible to make your own secondary. Actually the easiest process is to make 3 of them at once. Texerau tells how as well as the ATM bookset. Basically, grinding 3 surfaces against each other makes an infinite radius (flat) surface.
Also, there's a lot of plans on the web for making foucault testers for fairly cheap. When I make one, the most expensive single part is the dial indicator which I usually get for about $8 at Harbor Freight. You can also find used dial indicators at used tool stores or even swap meets and yard sales.

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