[EMS Discuss] Solar Foundry

Bob Miller kbob at jogger-egg.com
Sun Feb 16 10:34:28 PST 2014


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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