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
Polishing Query IIA

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Ian McKernan on July 19, 2002 05:51:19 UTC

Hiyah!

Its not so much the turned up edge that i'm worried about at the moment. The main hassle is the ridge and central hole. this is giving me a shape on the ronchi test that one of the guys refered to as "the onion".
I'm thinking that if i get rid of that (by doing longer strokes as suggested, MOT for a while) then that will reduce the width of the turned up edge as well, and anything thats left of this i can work out during parabolising.
I have been doing fairly long stints (like an hour or so)of either MOT or TOT duing polishing so far. Maybe this has been a problem?
I reckon i'll do it in 15 minute stints from now on, and test / press between each to make sure im not going too far and turning the edge over.

I'll post again in a couple of days with how its turned out.

Seeyahs!!

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