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Any comments?

Make everything adjustable and you'll have fun calibrating it. Make everything static and you'll wish you could adjust it.

I built a double fold my first time and I went crazy trying to acheive great focus and keystoning. It's a neat compact design though. Good luck

Cheers.

Good thing is the bottom section is a direct copy of the angles from a dukane 680 OHP, so it should be easy enough

Also note that I have not added most of the detail here... those fans are actually two ends of a light box...
And there is none of the ducting shown in the picture either...

Will update later

i gotta say that looks sweet! I gotta say though all those guide lines in goggle sketch up would srive me nuts though! Also how did you figure out the light angles and light paths in sketchup?

I think that this design is really neat, and I'd appropriate it (giving credit of course) if not for one question. Aren't there concerns with glare inside the box? I see alot of potential for light contamination as well. Also what size bulb are you planning on using?

Other than these questions sweet design man.

Would be an interesting build. Mirror angles would be critical and I am also interested what kind of lighting. How big is the enclosure and what kind of panel?

Make sure that there's no direct path for the light to go from the bulb to the LCD/fresnels. You'll want to isolate the light from the rest of the box so that it only goes in the directon that you intended.

Hi All,

Oh interest in the design

To answer a few questions.. SEE MY BLOG FOR THIS DESIGN!

The dimension are written on the design there.
The LCD is a 15.4" WUXGA (for 15" panel this design shrinks even smaller.)
The bulb is from a dukane 680..
As for light leaks and glare, you are correct, if this design was built as it stands, you'd have loads of issues, but you need to imagine that the box is split into 3 sections.

1 containing bulb.
1 containing top fresnel, top mirrir and projection lens
1 containing the bottom frensnel and window into the light box.


All the angles are very sensitive, this is why the entire mechanism is mounted on threaded rods, and everything can either move in all directions to some degree, or is clamped and welded into very accurate positions. For example all the frames containing the fresnels and LCD are made of aluminium square section, and those cylindrical tubes at each corner of the frames are drilled through using a bench stand... Accuracy will be vital.



At some point I will upload a finished sketchup diagram, and will make the sketchup file itself available for download.

Any concerns about heat buildup at the top of the box? It looks like your fans are at mid-height, which will trap hot air at the top...

Hi Archilea,

Yep you are right the fans will cause heat at the box top. Im currently redesigning the air flow for the box. And creating a more complete sketch too. Sticking a fan behind the FS mirror at the top of the box should sort the problem, along with a fan near the ballast that will be placed at the box bottom.

Should get on to posting the new design soon, its amazing how long it takes to get a workable idea when you are trying to shoe horn this much kit into a small space.

I saw this before, and wish I could make mine as compact, but don't think that I could do the lens shifting I wanted to, also since I'm using(attempting) LEDs, I don't think the lightbox could be folded...

Just curious, If your upper angle is not 90 (45+45) degrees, won't you change the aspect ratio and cause focusing problems, top to bottom on the panel? Perhaps the delta aspect ratio is not noticeable.
I guess the position of the panel is to lengthen the upper light path for the focal length of the lens.
I was thinking about a similar design but using all 45s. The bottom light path shouldn't cause a problem if not 45s.

ummm... WOW!!! holy crap guy that is f-ing crazy!!!

Why can't I see any of these pictures? Help section doesn't help.

I get an error when trying to view the attachment in the first post: "Sorry, but you do not have permission to use this feature. If you are not logged in, you may do so using the form below if available."

You might want to PM a Mod and ask them to look into it.

As far as the pictures in RobAndJonK's PLOG, it looks like they were hosted on an external service and it was not kept up. RobAndJonK was last seen on the LL Forum on 31st May 2008. If you PM them and ask them if they could re-upload the pics and fix the links, they might get the message.

I happened to save it because it was so darned cool

I was inspired by this design, and decided i wanted to make a similar build


heres my design