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
Need Advice

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on November 27, 2001 20:39:56 UTC

Sounds like a pretty normal pad finish except for the turned edge. I'd put the tool on top and try to get the turned edge out if possible. Of course, it all depends upon the slope of the TDE as it could be a zone out at the edge. Pads normally give a rough surface as to the zones and the way to reduce them is to change the length of the stroke so that the pads don't keep rubbing the same areas.
After you get the glass fully polished, it's time to make the pitch lap and at that point, the true surface of the mirror will start showing up. Pads normally produce zoney surfaces and this is just fine for the purpose that they were originally designed for - fast polishing of eyeglass lenses which can be several waves of error on the surface and still perform excellently.

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 1994-2024 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