Hopefully this schematic will help answer most placement questions before they are asked.

Download a PDF version: Click to view attachment

The field lens is actually 330mm. I think with your lens in that position you'd actually want about 1" forward and 1" backward movement for focusing.

Nice drawing!

Very nice drawing-

Thanks for doing this, it helps answer some of the questions I had about placement. Your work here is much appreciated...

Thanks guys, changed the field lens to read 330mm and fixed the range of movement for the triplet.

Should this topic get pinned?

THANK YOU!!!
I re-read the guide about 800 times and was still confused about the placement of stuff.. this makes it so easy even I can understand.

This NEEDS to get pinned.

They say a picture is worth a thousand words!

Rorshach,

Nice diagram, just one observation though. Coming from a metric country I found the references to inches all over the place very inconvenient, and even odd given that the fresnels FL's are always listed in mm.

Maybe it would be a good idea to put a a second "metric only" version with all measurements in mm so it could provide a quick reference for those using metric measurement. I know I could've made good use of it, I've hit the conversion sites so many times they're going to start charging me for bandwidth

Great job!

Cheers,
Arkay.

AS for me, it was refreshing to see it in inches, as I always have to convert too!

I would say Just stack the diminsions, both on one plan would be the easiest.

Please check the dimensions on this metric version:

Click to view attachment

Download a PDF version: Click to view attachment

Excellent work

Great work!

Measurements are a little off when using my converter, might want to check em:

14" = 356 mm (355.6 rounded up)
7" = 178 mm
28.25" = 718 mm (717.55 rounded up).
2" = 51 mm

Not that any of that makes a great deal of difference.

Cheers,
Arkay.

I have one question: Are those Interior Measurements?

i think it says internal diminsions below where it says TOP VIEW

Yep, I rounded them to nice even metric numbers.

Nice work Rorshach!!!!!

Indeed.

Very nice.

Love this thread... plus finally a metric system guy! I am going nut in US with all the measurements in inches, feet etc. No offense of course, but metric sys is way easier to use ;P. I suppose that is all about being used to it, so for who was raised in US/UK all those odd multples (like 6 inches = 1 foot) make sense, unfortunately they are tough for me to get used to... not to mention when fractions are involved... BTW the Brits recently dropped officially the old sys and adopted the metric sys as well, will that ever happen in US?

Gotta have metric!:)

freakQNC,



As I vaguely recall it has been attempted, don't remember how long ago though. Does anyone remember 'Think Metric!' ? But, ultimately, it didn't catch on.

I have a theory as to why it never caught on in the US: It's all to blame on the manufacturing sector and the way the government tried to migrate us to the metric system. Consider that all containers were created using nice memorable standard sizes - 12 oz. can of soda, 12 oz. can of soup, 1 gallon can of paint, etc. Now convert these standard measurement size containers to a metric size and now you have a weird, hard to remember number: How many milliliters are in a 12 oz can of soda? 354.something? I don't remember exactly. So now it would seem that the metric system is confusing as the numbers aren't easy to remember when converted from easy to remember standard sizes. The flip side of this is when manufacturing embraces the metric system and creates a container that is a nice memorable metric size: How many people in the US know what a 2 liter size of soda is? Exactly. But in the end, the metric system was created by the French: The French are silly. Therefore we can logically deduce that the metric system is silly.

We in Australia did our metric conversion in 1976 over a can of beer. Like you we had pints and gallons and miles and inches, but by the time we finished the dozen cans, we had forgotten the old imperial system and had gone metric.
We drive kilometres now not miles, and we put litres in the tank not gallons but we still get there. I still find myself converting to miles per gallon for fuel consumption but that’s the only time. If you took a poll, I think you would find the rest of the world has gone metric.
They make good chocolate ( the French that is )

Metric works because most people have 10 fingers to count on.

Just curious,

How come you opted for the horizontal bulb/mogul mount in your plans instead of vertical?

-Oloff

To accomodate the length of the bulb it made the smallest size projector case to mount horizontal (I think)

just a question...are all 15in monitors the same size? like mine is 12x9...would i just be able to follow this diagram inch per inch?

just getting crazy waiting for my power supply and lens to show up and want to start doing the box so i can have the fastest turn around in viewing pleasure

thanks

daniel

The actual liquid crystal is mostly the same but every panel has a different circuitry layout which changes to dimensions, therefore you should wait until you have your panel to measure.

How tall should the projector be? I only see width and length on the drawing. I ordered a 15" monitor yesterday and I just bought the plywood and want to cut it today.

You reallly need the panel first. Which panel is it? Maybe someone can give you the dimensions.

It is the 15" samsung kit from techbench. Skygunka built a projector with it, but never gave the box dimensions...

brain, i've already got my panel, my lens kit just came yesterday, and the lamp and ballast and socket....the only thing i'm waiting for is the power supply for the lcd panel and tempered glass...

the only area i'm coming into trouble with is the spaces need for venting with the lens and the panel?

do you leave just a little space down at the bottom? will the glass fill the whole box or does it need to be a little smaller to allow venting?

thanks
daniel

Hi Dan, You should leave a 1/2" gap at the bottom of the glass. The glass should fit tight on the other 3 sides.

doh! i just started looking back over the plans and found the 1/2" gap

i'm just confused on what the box should be...i mean if everything is going to have a gap in it how do i get the measurements? i get the gap with the glass and the air slit at the top of the box...but then the lcd and the fresnels are just going to be attached to the sides of the box? or do you put them snug on the top and leave a gap at the bottom?

the best i can tell is that i measure the box out for the lcd and then i can go get the tempered glass 1/2" shorter?

thanks for you help brain!

dan

Yes

excellent!!!! thanks brain i'll be able to start drawing it all out tomorow after work!

IT BEGINS!

on thing i have found helpfull in going from mm to the inch is that there is 25.4 mm in one inch. knowing that makes conversions way easy.

someone explained to me why metric didn't catch on... cuz it isn't organic... inches=tip o thumb to 1st joint feet=well doh! yard=stride of average man, etc ...

But it is organic. You have ten fingers and ten toes.

Okay, so in these measurements, what exactly is the 330mm fresnel measured to? The actual triplet lense itself or the base of it?

Also, what needs to be taken into consideration about the focusing box moving? If the focusing box is supposed to allow for 1 inch movement in either direction for the triplet to focus; I assume the measurement could be anywhere in range from 295mm to 345mm right?

320mm - 25mm = 295mm (close as it should be the 330mm fresnel)
320mm + 25mm = 345mm (far as it should be to the 330mm fresnel)



edit: One more thing, how do the dimensions change for the distances in between the fresnels and the LCD if both fresnels are on the same side? Does anyone know the measurements for that? I know it may have been discussed elsewhere, but what are the negatives to having it setup that way, besides not having keystone correction?

lol menuball, but what do you have that is a millimeter in lenth

I am building the enclosure. I am thinking of moving my ballast + capacitor out to may be a second smaller box and keep the main pj enclosure relatively light weight. I see someone else has tried it in the finished project gallery. Any special considerations in doing this?

Also over extended use does the ballast get heated up as well? If that is the case I will need to find a way to cool the other box too. May be then it will not be worth the effort.

How the meter was first defined:

They took the measurement of 1/4th the circumference of the earth from the north pole to the equator and divided this into 10 million parts. It was actually the distance between DunKirk and Barcelona on a merdian line that passed through Paris. (Those crazy french persons.)

http://www.essex1.com/people/speer/metric.html

From a survey on "Metrication" which is defined as adopting the metric system as the official method of measurement, it looks like everyone but the US, Liberia and Myanmar (Burma) have switched. And the last two of these three are in question because they never really gave an answer.

Metrication:
http://lamar.colostate.edu/~hillger/internat.htm

The US Congress allowed the metric system to be used legally in 1866, but didn't make it obligatory.

Timeline for Definition of the Meter
http://www.mel.nist.gov/div821/museum/timeline.htm

The US is the only industrialized country that does not predominately use the Metric system as it's standard of measurment. (It's a freakin' conspiracy)

The US was one of the original signers of the Treaty of the Metric System in 1875.
http://ts.nist.gov/ts/htdocs/200/202/lc1136a.htm


The whole "Think Metric" thing came out of the Metric Conversion Act of 1975 which was passed by US Congress as an intention to convert. It didn't have a timeline associated with it and conversion was considered to be "voluntary", thus it didn't really happen.
http://ts.nist.gov/ts/htdocs/200/202/pub814.htm#act


To sum all this up, the US is the only country that doesn't use the metric system on the entire freakin' planet, even though we legalized it in 1866, signed the Treaty of the Metric System in 1875, created a law to convert in 1975 that didn't require compliance AND, the most important of all, created a Metric version of the classic Chocolate Chip Cookie recipe! http://ts.nist.gov/ts/htdocs/200/202/lc1136k.htm#cookies

Laziness? I think not! (The chocolate chip cookie recipe had to take weeks)
Laisez-Faire politics? Heck no, this is the right wing US Congress we are talking about!
Government conspiracy? Absolutely!

Thanks,
Zendance

Maybe this will be Michael Moore's next project.

Maybe it would be a good idea if politics were not discussed in these forums. We're all friends here and we should keep it that way.

Friends help friends understand satire.

-Oloff

Yes, no position was implied by either of your comments, but the thread could devolve quickly into more than satire.

Actually, I thought zendance's position was quite clear! LoL!
Hence my reply poking fun at him.

Enough of these shenanigans (is that even how u spell the word??), there is projector stuff to work on.

No blood no foul,
-Oloff

Point taken, I agree let's move on!

This is from a page back and I don't know if you are still following the thread but... the exact measurements from the techbench panel I got are 12 5/16ths by 9 5/16ths (sorry those who want metric my tape measure has english). You should also know that on one of the shorter sides, there are three FFC tabs that just stick out of the side and have to be looked out for.

Measurements on plan at the beginning of post should be corrected to reflect 12 5/8" from LCD to triplet, not fresnel to triplet. It fouled me up and others, too. Sure works great when in focus, though.

Thanks