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: 35

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on April 14, 2000 02:19:31 UTC

You will want to keep the maximum speeds to be no more than what Bob did. This means that 30rpm on a 16" is like about 6rpm on the 35" mirror.
You also want to make sure that the table can support the mirror but you seem to be handling that with the casters (rubber ones) to support the sides of the table.
For the final pulley, you may want to make one in a mill with the appropiate cutters to make the groove. I`d make the pulley about 2` in diameter and allow for speed adjustments (go find the Mirror-O-Matic grinding machine on the web for some hints in that regard. I`d plan on a low speed of about 3rpm (for a 35" mirror) and a high of about 30rpm (for a 12" or so mirror) for the different pulley that you can put on the machine.
After you have that much done, you may want to make a convex disk so you can do grinding of mirrors of up to about 12" or so with the machine. A smooth sphere with shallow grooves about every 4" will be quite nice for doing the grinding.

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