Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Parabola for 18 aluminum mirror

  1. Apr 9, 2010 #1
    Parabola for 18" aluminum mirror

    Help; need to configure inputs into parabola formula to machine an 18" dia., 1.5"h aluminum disc. for use as primary objective mirror in telescope.
     
  2. jcsd
  3. Apr 10, 2010 #2

    Chronos

    User Avatar
    Science Advisor
    Gold Member

    Re: Parabola for 18" aluminum mirror

    Depends on the focal length. At f10 it little matters. What focal length do you have in mind?
     
  4. Apr 12, 2010 #3
    Re: Parabola for 18" aluminum mirror

    Focal length 79.2", 0.256 in. @ apex; f/4.4

    Using a CNC lathe but need inputs for autocad program to 'run' lathe for accurate cutting. Removing 32.53 cu. in. material.

    Not sure what to plot for points along 'x' to perimeter from center, depth of 'y'
     
    Last edited: Apr 12, 2010
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook