Morris Dovey wrote:
> Robert Scott wrote:
>> Regarding curved mirrors, the cheap thin mirrors
>> that you can buy to hang on the wall are actually
>> quite flexible. One might consider bending them in
>> a fixture. Any guess as to what radius of curvature
>> could be achieved without risking fracture?
> An interesting question...
> You'll want to capture the ends in a pair of
> swiveling clamps and press down on the full width at
> the center in 1/8" or 1/16" increments so you know
> how far it bent before fracturing.
> I'd be interested in knowing how well the silvering
> withstands the bending process, too.
> I'll contribute the first $ if you'll post the
> results here...
I have mirrors 2' x 8' x 1/8".
I just lifted from the center using a vacuum tool.
I lifted the center about 2.5 feet.
That's a lot of curvature.
Mine haven't broken yet and it's been over 10 years .
Of course this curve is a Catenary but the parabola
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Duane C. Johnson wrote:
Good information! That tells me that 1/8" glass should work for
parabolic reflectors up to /at least/ four times the focal length in width.
Good to know - thank you.
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