Hi Lumers,

I am trying hard and finding it difficult to find a piece of suitable sized tempered glass for my projector. Any of you have any alteratives, maybe some tempered glass you found in something at the hardware shop that worked out cheaper than having a piece of glass cut and tempered for you.

I live in the UK and I am looking for a piece 13.5 inches X 12.00 or there abouts.

Any help on this appreciated guys.

Build in progress and looking realy good, I have all the parts I need execpt tempered glass. I will get some photos of the build on here real soon, its looking wicked.

Slinger

Since it doesn't matter where you place the tempered glass/heat shield, you can move it closer to the lamp. Doing this means you can use a smaller piece - all you need to do is frame it to fit.
Try looking for a work light that has tempered glass on the front of it - like these: eBAy.co.uk

Make sure your framed tempered glass doesn't interfere with your airflow, though.

Thanks for that quasi, another why didn't I think of that moment. I did get some tempered glass with the light unit I bought for the projector, but it's too big to fit and tempered glass won't cut, it just shatters. I will get a flood light off eBay and use the glass from that.

Thanks again, sound advice as always.

Slinger

Hi there

You could look into polycarbonate (lexan) from http://www.plasticonline.co.uk/

they cut to size, probably less than £5ver +PP for the size your after:

http://www.plasticonline.co.uk/index.php?a...Doc&docId=8


Z

Thanks Zepp,

Have you used this sheeting for your projector? Just trying to find out what temperature this will go to.

Slinger

Yes, But I haven't tested it yet as I'm still building. From what i have found out (from the forums) it should be a suitable suitable material. Have a look for 'Lexan' around the completed projects.

Z

Hi Zepp,

Lexan (polycarbonate) seems to do the trick. My only concern is that I am building a folding prog and I am not sure how it would cope with a lamp burning vertical onto it. Most of the lexan progs in the blogs are straight through's. I have emailed the supplier on the link you gave me and popped the question to them (handling temps) keep you posted on there reply.

Cheers
Slinger

You can use a smaller piece of glass if it's closer to your lamp.

I got a piece of glass tempered at a local shop. It wasn't all that expensive,

Halogen work lights are also an excellent source for pieces of tempered glass, are usually reasonably cheap, and will defintiely withstand the temperatures.

Hi Supra,

I'm not sure a smaller piece of glass would do the job, air flow in the bottom of the projector is going to have to be goodto get rid of the heat. I will post some pics tomorrow so I can show you what I am talking about. My panel controller is placed right at the rear of my bulb so I'm going to need as much space as I can spare between the lamp box and first fresnel for air flow. Hoping to get the LCD and fresnel in tomorrow to have a bit play around.

Thanks for the suggestion. I may go with the floodlight glass and see how hot we get.

Slinger

Zepp & anyone that may be interested.

Got an email back from the Polycarbonate sheet (lexan) supplier you gave me the link of. It is good to 150 degrees C. Good news for those who wish to use it in folded designs.

Puts my mind at rest, im going to get mine ordered tomorrow.

Cheers
Slinger

Yup. Polycarbonate is good for some high temps.

Still, there's a lot of variables with the smaller glass. If you enclose the light with the glass at the top, then it encloses the heat better, and you can remove that heat with relative ease, but there's lots of ways to make it work.

If you can find a non-functioning flatbed scanner and salvage the glass from that. It is tempered glass and generally 10" wide x 14" long. It is usually secured with some stout double-sided tape, so be careful removing it. Mine cost $5 and works fine on my 575W unit.

Nice one, thats good to know. The size I got was about 3 GBP so I just ordered 2 so I could experiment! Though I did forget to deduct the .5 inch at the bottom for air flow... Have to think of some work around!

Cheers

Zepp

I ordered a A4 8mm sheet for my build. I removed the reflective layer off the back of the LCD tonight so im ready to put mine together now. Still need to work out what im doing about keystoning.

8mm for the polycarbonate? is that what was recomended by the company or did you read it somewhere? Just curious as I got thinner, but i did get two sheets so I could potentialy put them together...

Cheers

Z

Hi Zepp,

No recomendation for the 8mm, I got 8mm so my MDF would be flush to the top of the polycarbonate. I am sure any thickness will be fine.

Cheers.

Slinger

I used 3mm myself, 'cause it was in stock and reasonably cheap.

Cool thats good to know

Thanks

Z