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Thx for your comments, this short's a taster for the longer 40 minute version. You can make grinding machines to lessen the load however unless you want to make lots of mirrors or big ones it's impractical. Grinding to achieve a spherical curve is surprisingly easy...the polishing and parabolic 'figuring' is where you have to be more careful but it can all be done by hand. Seeing stars and planets your own mirror is profound...you in touch with your universe. 200mm mirror achievable in 5 days.
Skygeezersi 3 months ago
The full video is here. I found it after about an hour looking - just search for p0iyRgRhvLk in youtube.
david85allen 4 months ago
all this so his wife can see her face more clearly. what vanity
gettingahandle 4 months ago
And I thought it took months!
MrUnclestupidhead 6 months ago
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What's wrong with the hogging out methods described by Porter and others, in 'Amateur Telescope Making'? Too slow, and laborious I suppose. So, I say what is a hobby for, if not to murder time? And in this case help keep you fit! It takes a lot longer than this, to make a telescope mirror! Most interesting all the same. Thanks.
MiCompre 8 months ago
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Where I can find full video?
luminousdots 8 months ago
Where I can find full video?
rapsod1911 10 months ago
How much does a mirror blank cost?
ParaglidingManiac 1 year ago
don't those grinding tools require enormous precision when done like that??
I don't understand why people don't make some kind of grinder on a pivot such that the shape shows up naturally and could even be powered so as to not require enduring manual labor. that way it should also be straight forward to make 1meter mirror or even larger
DanFrederiksen 1 year ago
@DanFrederiksen:
The tile grinding tool is made conave so it is the mate of the roughly concave mirror. They mutually grind each other, and mutually spheroidal shapes naturally result.
Parabolization is done by polishing against the pitch lap.
With a 1 meter mirror the parabolization is begun during the grinding, because in that case the thickness of the glass to be removed is too much to be done by just polishing on the pitch lap.
bethpage89 1 year ago
looks like a lot of work!
2plus2is9 1 year ago
So what's with the piano player playing so loud that it was difficult to hear? You might also explain that it takes a LITTLE longer to grind and polish than you indicate.
good looking mirror though.
lefthandtwist 3 years ago
BBC just mixes like that, who knows why. I have a number of BBC productions on DVD where I can barely hear the narrator over the music.
demjp8RqDA 2 years ago
Very impresive
XPecto 3 years ago
What a beautiful pitch lap...
balzerbarn 3 years ago