[EMS Discuss] Solar Foundry

Mark Danburg-Wyld danburgwyld at gmail.com
Sat Feb 22 14:05:57 PST 2014


We have a death ray, Um, I mean, a solar foundry. Melted a small chunk of
zinc (aka a penny) in about a minute, trying some glass now.
On Feb 16, 2014 10:34 AM, "Bob Miller" <kbob at jogger-egg.com> wrote:

> Could you just get a stack of bricks under your hot spot and
> add/remove bricks as needed?
>
> Alternately, you could put shims under one end of the flat legs under
> the lens, and by tilting the lens stand, move the lens up and down by
> smaller amounts.
>
> On Sun, Feb 16, 2014 at 9:26 AM, Mark Danburg-Wyld
> <danburgwyld at gmail.com> wrote:
> > Not *quite* clear skies this morning, but enough to figure out that I
> need a
> > way to make the height of the platform adjustable if this is going to
> fly.
> > Probably an old car jack could be modified to work, anyone got a better
> > suggestion?
> >
> > On Feb 4, 2014 8:18 PM, "Mark Danburg-Wyld" <danburgwyld at gmail.com>
> wrote:
> >>
> >> Went back to Craigslist, got another screen. This time I think I hit the
> >> jackpot. The fresnel lens has clearly circular grooves, indicating that
> it
> >> is a spot lens instead of a linear lens. And it's huge: 56" x 32". More
> as
> >> it develops...
> >>
> >>
> >> On Sat, Feb 1, 2014 at 3:37 PM, Mark Danburg-Wyld <
> danburgwyld at gmail.com>
> >> wrote:
> >>>
> >>> Sad news, I can confirm that the frosting is having some impact. I can
> >>> get a lot hotter spot off the clear 11" square than from the much
> larger but
> >>> not clear lens. Bob, I will take you up on the offer of the Novus #2,
> see if
> >>> that helps. Worst case, well, back to the shopping around for a better
> >>> lens...
> >>>
> >>> On Feb 1, 2014 12:37 PM, "Darrell Perko" <dperko at efn.org> wrote:
> >>>>
> >>>>
> >>>> Ask, and ye shall receive!
> >>>>
> >>>> On 2/1/2014 10:20 AM, Mark Danburg-Wyld wrote:
> >>>>
> >>>> Now all I need is some unfiltered sunlight...
> >>>>
> >>>> On Jan 25, 2014 11:37 PM, "Scott" <sceptic4life at gmail.com> wrote:
> >>>>>
> >>>>> > The frosting might not affect infra red as much as visible range.
> >>>>>
> >>>>> > Sent from my iPhone
> >>>>>
> >>>>> On Jan 25, 2014, at 10:20 AM, Bob Miller <kbob at jogger-egg.com>
> wrote:
> >>>>>
> >>>>> > A 52" irregular plastic box?  We can hold a puppet show!
> >>>>> >
> >>>>> > If the frosting is on the opposite side from the Fresnel grating,
> you
> >>>>> > might be able to buff out the frosting with Novus #2 polish.  I
> have a
> >>>>> > bottle if you want to try.  If you know what kind of plastic it
> is, you can
> >>>>> > also clean it and wet it with [solvent] to melt and re-flow the
> surface.
> >>>>> > The second approach is easier but more likely to destroy the lens
> if it
> >>>>> > doesn't work.
> >>>>> >
> >>>>> > Also, be sure to try passing light through in both dimensions.  The
> >>>>> > interaction of the grating with the frosting may work differently
> in one
> >>>>> > direction than the other.
> >>>>> >
> >>>>> >
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> >>>>
> >>>>
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> >>
> >
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>
>
> --
> Bob Miller                              K<bob>
>                                         kbob at jogger-egg.com
>
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