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
First Time Mirror Grinding

Forum List | Follow Ups | Post Message | Back to Thread Topics
Posted by Chad Horton on July 3, 2001 16:53:26 UTC

I just completed initial rough grinding on my 8" F/8 mirror. I have reached my sagitta depth of 1/16" and have proceeded according to Texereau. At this point I'm not sure where to go. In his book he says to proceed with the use of a "centered stroke of very large amplitude" to finish the rough grinding to get rid of the ledge on the outside of the mirror and the ledge on the center of the tool. Am I making this too complicated? Do I simply go up and down with a centered stroke until the ledges are gone and I have a perfect sphere or use the "normal stroke" (W pattern) until the ledges are gone. I have read on the internet about using just the normal stroke to finish rough grinding.

Any advise would be appreciated. Also, being a first timer I used up all of my #80 grit so I'm waiting for more to arrive. Thanks for the help.


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 1994-2022 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