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  1. #1
    plateglass's Avatar
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    Default The Diamond trial



    After a quick try with a diamond cutting disk im going to hog out a 5 inch test mirror with the diamond cutting disk and ill make a tool tile from a spun cast.
    Diamond cutting disks cut very fast and no need for carbo just lots of water

    the goal is to eliminate the first 2 or 3 steps with carbo and grind with a tile tool from 220 grit once ive hogged out the mirror, thus saving on carbo and time, ill keep you all updated as progress continues..for now im making a grinding machine,one i made in 97, ill add photos in the next few weeks.

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  3. #2
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    Default

    Hi Plateglass ...Sounds like a job saving and time saving task ...Please do post pictures when you have time ....
    16in Night sky
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    F4.5 , 90mm refractor 500mm FL , 7in
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    classic Big-mac , Meade eye pieces with a few odd balls thrown in ...
    If you cant stand behind the american soldier ,
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    Please stand in front of one ...

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    Default

    Good luck. Hope it works for you. Like Rich said, keep us informed.

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    Default

    Hello plateglass, and welcome to Astronomy Forum. I'm an oldtimer when it comes to mirror making. Do keep it coming and keep us posted on how it goes with your project.

    6 inch F/5 GEM mounted reflector

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    >)))))*>

  6. #5
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    Default

    Sorry to those awaiting my diamond trials but i am in the process of making a draper machine, should have it finished this weekend !! will post photos
    diamond trials will start before xmas im hoping.

  7. #6
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    Default

    Looking forard to how this developes, good luck.
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    Cloud Dependant Astro Gear !!!
    10x50, 20x80 Bin's,
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  8. #7
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    Default

    Quote Originally Posted by Canon Pete View Post
    Looking forward to how this develops, good luck.
    So am I.

    Eric
    Name: Eric

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  9. #8
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    Ive been thinking what would the surface accuracy of a 4" convex lens be say the ones used in canon L series lens,compare this to the surface accuracy of a 1/4 wave mirror ?

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    Default

    High-end photographic and industrial lenses, for example Canon and Nikon use very high degrees of surface finish and surface accuracy on their product.

    I have seen detailed performance data for Canon L, EF and ES series lenses, along with similar data for Nikon's wide-field imaging lens systems related to semiconductor equipment. While the disclosure restrictions prohibit me from sharing the material itself, I can say that they are produced to an error below 1/10 wavefront.

    Professional photographers are incredibly sensitive to lens performance, and are very discerning about aberration, however it manifests, and from whatever source.

    In general, even consumer level camera lens optics outperform lenses in their counterpart mass-produced telescopes. I have not looked in a while (perhaps I'll do so over the weekend), but I think DPReview used to maintain a partial database containing quantitative lens performance data. Some figures of merit might be found there.

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  12. #10
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    Default

    Thanks Austin for that,after watching a video of how lens are made i am thinking its possible to polish a mirror in less than 30 minutes for whatever size, all i have to do now is put my theory to the test and that will require making a high speed polishing machine !!

 

 
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