grins projector, recoil and test light builds

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grin
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Kennybobby,
It doesnt look like it, seems to be equal focus. If I hold the OL comp light at the focal point it will focus back and burn your hand. If I turn it a little it will throw the beam out. I think the light they are talking about it more square. When I get a stand/cradle built for it I will have more of and idea. I also want to set it up so I can swap the light engine. Now I need a new AC/DC tig welder to weld aluminium it is too big to take to work.

Enderman
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Agro wrote:
At what point does one need to take precautions not to blind pilots above?

When you start dealing with lasers instead of flashlights.
grin
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Did some work on the zoo-me-150mm this morning. The drawing is a work in progress, usually I build things without drawing them except for electrical circuits. the piston/heatsink is 42mm diameter. The lower bush will be 42mm long. A copper or aluminium sleave? Will cover the magnetic limit switches. To save length the motor will be noncaptive mounted in the piston. I am yet to work out how the cables will lay when the piston moves.




kennybobby
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Nice looking job on the machining—copper can be difficult to get a good finish; its so soft, gummy and grabby causing lots of pull-outs.

Are you looking to use a traveling-screw type actuator with the screw passing thru the motor.

Now i used to think that i was cool,
drivin' around on fossil fuel,
until i saw what i was doin',
was drivin' down the road to ruin. --JT

grin
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I use a lot of high speed steel so I can make the cutter I want. I find the last few cuts need to just skim the surface off. 8 use high speed chuck. Wd40 and slow feed. Takes times and hone your cutter probably most important. There are 5 pieces of copper bar there silver soldered together. Yes that type of motor, I was going to have a fixed motor but this way will be better.
Not sure how to do the cables yet. I could bore a hole next to the barrel with a hole for the cables to pass through. Put a spring loaded plunger in there to push any slack down the bored hole. The other thing is if there are no snags the piston will just bundle them up

kennybobby
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i made some notes on one of your previous drawings just for talking purposes.

Do you see this as 3 Lens as marked, is that a correct assumption?

Is the distance from L2 to L3 fixed?

For focusing you are wanting to move L1 (fixed to LED) with respect to L2?

Would it matter if the L1 to L3 was fixed and L2 was moved for focus?

i was looking at a concept in which the heatsink was shortened into a collar piece that is press or shrink fit onto the copper tube at the L1/LED end, and then move L2 for the focusing.

Now i used to think that i was cool,
drivin' around on fossil fuel,
until i saw what i was doin',
was drivin' down the road to ruin. --JT

grin
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It is hard for me to explain probably because I dont really know what Im talking about. I only know what i see and I dont know how it works it just does. Yes it could be looked at as a 3 element lens. L1 is fixed and wont change although I suspect aperture has something to do with the beam characteristics. If L2 and L3 are fixed L1 can be moved to focus the lens. In a follow spot the light is in an elliptical reflector. This reflector focuses to a second spot which is what the lens focuses on. In these spotlights they move L2 to adjust the beam size. Depending on where the elements are changes the beam shape. To zoom in L2 moves toward the led, L3 moves away from L2. Zoom out L2 moves away from the led. L3 move toward L2. When I write it down, that is why they only move L2. But after thinking about this, L3 has to move to zoom in and out. My idea when building the light is to cut down the amount of light hitting the barrel of the lens reducing stray reflections. So L1 is designed to only let light out that will hit L2, when fully zoomed in the light from L1 only illuminates the centre of L2, zoomed out light from L1 illuminates all of L2. The reason for this is that at all postions of travel L3 is fully illuminated. That is the reason why I build 2 soon to be 3 element lens lights. They are hard to get right, i will eventually.

Edited to clear it up

grin
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Took the mirror outside to see how it fitted in a temporary stand I made for it. As i walked into the sun the mirror burnt my ear. It is dangerous in the sun.

grin
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Didnt do what I planned over the weekend but I did work on lights. Waiting for 310mm and 250mm glass lens.
11inch search light.













9 1/4 inch on reflector for it yet.

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Nice workspace you’ve got going on, that’s gonna be a heavy spotlight Smile
Looking forward to more progress pics.

grin
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They will be heavy but they are not really designed to carry around. These were made from off cuts thats why they are 6mm and 4mm plate. I think next time I will build them in stainless steel.
3-4 weeks ago I ordered another reflector from edmunds optics. When I got home it was at my backdoor. 600mm edmundsoptic parabolic reflector they are not optic grade but reasonably priced and still throw a good beam.

My house is like a shed so I call it a shouse. Haha I have the welder setup in the kitchen. My lathe was too big and heavy to put in the dinning room so it had to go in the shed.

Agro
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Enderman wrote:
Agro wrote:
At what point does one need to take precautions not to blind pilots above?

When you start dealing with lasers instead of flashlights.

Check:
As far as I understand the lowest steady flight levels are different across the world and go as low as 300m above terrain.
A 10 Mcd light (that huge reflector should exceed that by a huge margin) would give 111 lux at that distance, assuming that 300m is enough to get full focus.

Seems quite bright.

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Wow “ grin “ Shocked Great idea on the wheel selection ! Big Smile , I never thought to look for a parabolic reflector. There are several irons in the fire now !!
.
Nice welding on the big light. I can see that you enjoy a challenge. Thumbs Up
.
Thanks for keeping us up to date with pics Beer
.

grin
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No worries, here is a link to them parabolic reflectors after playing with them they are the best of both reflector and lens lights specially the glass optic grade mirrors. Enderman posted a link from ebay for glass ones they are expensive but top quality. I want a 9 1/4” for the smaller light. glass parabolic reflectors

Enderman
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Agro wrote:
Enderman wrote:
Agro wrote:
At what point does one need to take precautions not to blind pilots above?

When you start dealing with lasers instead of flashlights.

Check:
As far as I understand the lowest steady flight levels are different across the world and go as low as 300m above terrain.
A 10 Mcd light (that huge reflector should exceed that by a huge margin) would give 111 lux at that distance, assuming that 300m is enough to get full focus.

Seems quite bright.


And sunlight is 111000 lux.
The brightness isn’t the problem.
The problem is the speckle and refraction of a laser hitting a piece of glass, which makes it near impossible for a pilot to see through.
Helicopters have flown over the Luxor beam which is a few billion candela and it’s fine because it’s normal white light.
Agro
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Enderman wrote:
Agro wrote:
Enderman wrote:
Agro wrote:
At what point does one need to take precautions not to blind pilots above?

When you start dealing with lasers instead of flashlights.

Check:
As far as I understand the lowest steady flight levels are different across the world and go as low as 300m above terrain.
A 10 Mcd light (that huge reflector should exceed that by a huge margin) would give 111 lux at that distance, assuming that 300m is enough to get full focus.

Seems quite bright.


And sunlight is 111000 lux.
The brightness isn’t the problem.
The problem is the speckle and refraction of a laser hitting a piece of glass, which makes it near impossible for a pilot to see through.
Helicopters have flown over the Luxor beam which is a few billion candela and it’s fine because it’s normal white light.

It takes far less than direct sunlight to blind night-adapter eyes.
Luxor is an interesting example though – and they do take precautions not to blind air traffic – they first do a mild strobe and then turn their 39 lights one by one.
Enderman
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Agro wrote:

It takes far less than direct sunlight to blind night-adapter eyes.
Luxor is an interesting example though – and they do take precautions not to blind air traffic – they first do a mild strobe and then turn their 39 lights one by one.

Yeah see this is a misconception, a laser doesn’t “blind” pilots by making their eyes hurt like a regular bright light does, it “blinds” them by making it hard to see out of the glass windows.
Have you ever been out during a sunny day and tried to look through a window into a dark shop?
grin
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Think I might have a problem spiders Big Smile the first one I made from a vee belt pulley it has no copper block. The others a made from plate water. It will be interesting to see how the passive copper spider works. The glass one has a 6inch focal length. So I plan on having a collar around the led on all off them eventually with the aperture matched to the reflector that will stop any spill hitting the side of the drum.






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Impressive grin!

Current Collection:

BLF: BLF-GT90, BLF-GT70 (CW Sliced), BLF GTmini, BLF-LT1; 

BTU: Shocker (3 x SST-40 @ 8A)

Solarforce: L2P (XM-L2 U3 @ 4A), MPP-1 (XP-L HI @ 6A), MPP-3 (3 x XM-L2 U2 @ 12A), M6 (Nichia 319A @ 6A), M8 (XHP-50.2 @ 9A), 9x (9 x XM-L2 U2 @ 2A)

Coming Soon: Lumintop: BLF-GT4; 

grin
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Thanks
I have been working on getting meter readings right so I can do some comparisons with collars. I have the same size round nose router bit as the genuine collar. So I will make one from aluminium and polish it. I will also make one from brass then tin it with pure silver. The tests so far prove I can get it to focus as good as the genuine one. Have a hunch the silver coating will be as good as you will get for home built.

likevvii
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Ohhh yesssss! DIY collar!!

grin
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Sssh can be a little controversial. Research suggests silver may be as good as as as .. I can make. Cutting it by hand is very accurate if i can find the appropriate diamond cutter I will try glass.

grin
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likevvii,
How is the LEP going? I would like to build 900mm LEP recoil.

likevvii
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It is going really really good.
I will soon be making some post about it.

Almost all of the critical components have arrived.

I think i’ve put like 60+ hours on it so far?

grin
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Likevvii I cant wait to see it.
I have the platform to build a monster hopefully a LEP recoil. It has been sitting in the paddock for at least 20yrs. I started it about 10yr ago so it should run just need to give it a service, flush the fuel tank and bleed the fuel lines. I have the diff but It will need an alternator mounted on it so maybe an electric motor and the diesel engine will be a battery charger.

G0OSE
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Grin, you don’t do things by half do you lol!? Silly so interesting.

grin
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Cheers GOOSE, sometimes I get half way through something and then realise it wont work or could be done a better way Big Smile I found the 900mm mirror when I did a random ebay search and couldnt resist buying it, it was cheap for what it is and a great addition to my collection of parts and lights.
It has been a steep learning curve and this thread made me realise how little I actually know so I have gone back over things and reassessed what I am doing. Now I have a better understanding of why I decided to build the lens lights like I did. They are based on elipsodial reflector spot lights, telescopes and camera lenses.
A bit of an update I have been sorting things out the last week or 2 and havent done much on the lights. Im also wait for parts from china and that could be a while.
One of the things i did get was a 68mm parabolic mirror from aliexpress with the aim of building a smallish recoil.

The focal point appears to be down in the mirror which makes it hard to use it for what I brought it for. but when I turn it upside down on an LED I get this result.

It looks promising for a shuttering collar to keep light of the internal lens barrel Wink I think a bigger one of these will cut the aperture i just need to do some calculations to work out aperture size. Then destroy one to see if it works.

grin
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Enderman
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Damn that’s a tight spot, what lens is that??

Looks like a regular spherical lens, not aspheric, because of the spill around the square die projection

kennybobby
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Australia NSW News—Police in Hunter Valley were called by numerous alarmed citizens who reported UFOs flying in the local sky. Investigation details were not available.

Now i used to think that i was cool,
drivin' around on fossil fuel,
until i saw what i was doin',
was drivin' down the road to ruin. --JT

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