FmC's Hand Made DIY 2015 comp entry; "WW2 Searchlight". Finished!

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pommie
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Sorry for the thread hi-jack Fmc, it finishes here Smile

https://en.wikipedia.org/wiki/Parabolic_reflector

nuff said

Cheers David

Nothing to see here folks, move along...

Old-Lumens
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A google search for parabolic reflectors, turns up some stuff in the 12" diameter range and less than $50. 

http://www.amazon.com/Large-Parabolic-Reflector/dp/B00A3DHWUK/ref=sr_1_2?ie=UTF8&qid=1436193221&sr=8-2&keywords=Parabolic+Reflector

http://www.ebay.com/itm/STRONG-13-ACRYLIC-PARABOLIC-MIRROR-PROFESSIONALLY-MADE-REAL-SOLAR-MIRROR-/181698655851?pt=LH_DefaultDomain_0&hash=item2a4e15766b

 

I know it's not AU links, but I would think there's stuff like this over there too. Maybe not.

 

 

EDIT: http://www.ebay.com.au/itm/STRONG-13-ACRYLIC-PARABOLIC-MIRROR-PROFESSIONALLY-MADE-REAL-SOLAR-MIRROR-/181698655851?pt=LH_DefaultDomain_0&hash=item2a4e15766b

Hell, it's almost cheaper if I buy one and send it to you. What a difference in price!

My PayPal address: oldlumens (insert the @ sign here) gmail.com

My YouTube Flashlight Video Channel

The BLF Modding Links Thread 

http://imageshack.com/a/img922/1374/jQ2wdL.jpg

 

DavidEF
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pommie wrote:
Sorry for the thread hi-jack Fmc, it finishes here Smile

https://en.wikipedia.org/wiki/Parabolic_reflector

nuff said

Cheers David


Good thing you did post this link. Otherwise, FmC might not know that the satellite dish is a no-go for this project, because it is off-axis. Smile

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Rufusbduck
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I wonder if you could shape a parabolic mold negative(think beehive shape) then use it to cast a Fiberglas and epoxy reflector. Do your best Richard Dreyfus imitation. Whom knows? You might even be able to pick it up. Kind of like the way integrating spheres are done but in a parabola.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

sandalian
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Holly..
Can’t wait to see all the progress and final product!

I'm switching my BLF account into LumenZilla. Thanks!

DavidEF
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Here’s a parabolic mirror on ebay that is in bidding. As of 1:00 PM EST, it has one bid and is at $9USD. Listing says it will ship to Australia. Has free shipping.

Edit: It is 40.5cm size.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

Rufusbduck
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68 cm focal length. At that distance you would need an intermediate lens to get the light onto the surface.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

FmC
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Thanks for the discussion, guys.

Believe me, I spent a lot of time searching on-line for something suitable, with a reasonable price.

I'm choking on forking out for four XHP's, never mind ~$150 for a reflector...

I have some "97%" reflective flexible adhesive mirror squares in the mail, so I'm really just looking for a suitable shape to coat with them, although a 'ready to go' reflector would be nice.

DavidEF wrote:
Good thing you did post this link. Otherwise, FmC might not know that the satellite dish is a no-go for this project, because it is off-axis. :)

Explain to me why I can't use the satellite dish if it's tilted on an angle, or if the emitters are off-center?

Beer

 

 

 

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(“It’s good that most people can’t remember their previous lives. Otherwise
things would be a lot more complicated than they already are.”
Ajaan Lee Dhammadharo)

FmC
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Ronin42 wrote:
I assume you have seen http://budgetlightforum.com/node/40251[/quote]

 

It's ideal, apart from;

"Asking 325
Shipping 18

U.S. Only"

 

Smile

pommie
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FmC wrote:

Explain to me why I can’t use the satellite dish if it’s tilted on an angle, or if the emitters are off-center?

Beer

 

 

 


You can, however the focal length is a bit long.

Cheers David

Nothing to see here folks, move along...

FmC
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Thanks David, got it Smile

The search continues...

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DavidEF wrote:

So, you are perfectly correct, except that under certain circumstances, I am also correct.
For the record… I absolutely love that statement. Beer Pure brilliance! I want to use that as my sign off line. Big Smile
DavidEF
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J-Dub74 wrote:
DavidEF wrote:

So, you are perfectly correct, except that under certain circumstances, I am also correct.
For the record… I absolutely love that statement. Beer Pure brilliance! I want to use that as my sign off line. Big Smile

Go for it! Wink I guess I was too dumb to know how brilliant I was being. Silly

The Cycle of Goodness: “No one prospers without rendering benefit to others”
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FmC
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This seems to be the best option I can find in a pre-made solution. Almost perfect size for the body I have, good focal length, only costs half the earth... I know I can get it in a couple of days, being local to me. Not sure what impact the small hole in the center would have, but I could patch that with some reflective material.

Of course, the other solution is to make something.... after a bit more searching, I came across this site, which made understanding the parabola easier for me.

I'm also planning to make a few cardboard parabola cut-outs that I can take to the dollar-store, in the hope that they may have a dish/bowl that just happens to have a parabolic contour.

 

 

 

DavidEF
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FmC wrote:

This seems to be the best option I can find in a pre-made solution. Almost perfect size for the body I have, good focal length, only costs half the earth… I know I can get it in a couple of days, being local to me. Not sure what impact the small hole in the center would have, but I could patch that with some reflective material.

Of course, the other solution is to make something…. after a bit more searching, I came across this site, which made understanding the parabola easier for me.

I’m also planning to make a few cardboard parabola cut-outs that I can take to the dollar-store, in the hope that they may have a dish/bowl that just happens to have a parabolic contour.

 

 

 


That Edmund Optics mirror looks so perfect! Have fun trying to find/make something. Hope it goes well for you. I’m looking forward to seeing your finished product!

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

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That 40.5cm mirror I linked earlier is still at one bid $9USD and has 14 hours left to go. It will probably end up well below the $62 price of that Edmund Optics mirror. If nobody else bids on it, somebody’s gonna get it for $9USD. It can ship to Australia, and shipping is free. Smile

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy

FmC
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That mirror looks great, but too long a focal length, & a little too large. Also, I don't think they are going to ship for 'free' somehow Smile

There's quite a few places selling it, & the cheapest I could get one for is around $145.

 

Fritz t. Cat
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Maybe for a long focal length like that, you could use a microwave dish. It seems the main problem would be getting it smooth and shiny. A simple way might be to cover it with aluminum foil.

Flashlight designers should look at lighthouses and pottery.
这些谁设计的手电筒应该看灯塔,以及在陶器。

FmC
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 I spent a little time yesterday making a parabolic cut-out. I'll take it with me to the shops today, on the chance that I find a bowl or something with the same contour.

 

And a question for the driver gurus;

 If I were to piggyback 3 or 4 FET's on the same board, will the 13a have a strong enough drive signal to operate them all?

Rufusbduck
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With a nice high gate voltage a good FET can run up to 100A.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

FmC
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Rufusbduck wrote:
With a nice high gate voltage a good FET can run up to 100A.

 

Feel free to chime in over here...

 

FmC
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Little bit of progress yesterday in post #1.

Actually, It may have been a step backwards.... :~

 

& a small step forward today in post #2.

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Sorry to hear about the set back, but it's great to see you have a sense of humor about it with "Jack" and all.

FmC
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A little more progress today in post#3.

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At least the write-up is already excellent, great reading, that will impress the judges as well Smile , I hope that the mirror will work out in the end. Keep going!!!

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Light engine is looking great and so it your write up and pics.  Smile

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Jacks a good looking assistant but he appears to goof of as much as my two assistants. I bet if the three of them got together there'd be a bunch of trouble. Its good to see some progress on the light.

 

djozz quotes, "it came with chinese lettering that is chinese to me".

                      "My man mousehole needs one too"

old4570 said "I'm not an expert , so don't suffer from any such technical restrictions".

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That shallow, long focal length Edmond Scientific reflector looks like it should be used in a retro configuration. The light sources they used in WWII search lights emitted in all directions.

Flashlight designers should look at lighthouses and pottery.
这些谁设计的手电筒应该看灯塔,以及在陶器。

Rufusbduck
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What about using your template to make a clay negative and forming the plaster over that

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

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