Film-Tech Forum ARCHIVE: Heat Filter Orientation

my profile | my password | search | faq & rules | forum home

»	Film-Tech Forum ARCHIVE » Operations » Film Handlers' Forum » Heat Filter Orientation

Author

Topic: Heat Filter Orientation

Frank Angel
Film God

Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999

posted 07-25-2002 01:59 PM

Ok, I finally got heat filters for an Orc 4500W lamphouse (they came with no instructions of course). The filters have a small paper dot on one corner of the class. Should I assume that the dot is an indication of how the glass is to be orientated in the holder? Dot towards the bulb, dot away from the bulb? Or doesn't it matter at all which way they are facing?

If it would be better to talk to the manufacturer to get an answer, does anyone know if ORCON is still in business and if so, do you have a number I can call to get an answer.

And then if these filters do need to be oriented in a particular way, is there a way to tell by looking at the glass itself, because the other machine has filters with no marks on them at all and I have just been putting the glass into the holder any which way.

Any help would be appreciated.

Thanks,

Frank

| IP: Logged

Phil Hill
I love my cootie bug

Posts: 7595
From: Hollywood, CA USA
Registered: Mar 2000

posted 07-25-2002 02:41 PM

Identify the coated side of the glass by holding the glass so as to see a light reflected off the surface. The coated side goes toward the heat source (lamp).

| IP: Logged

Frank Angel
Film God

Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999

posted 07-25-2002 11:28 PM

Thanks Phil; I did look every which way and BOTH sides look like they are coated, or at least there is nothing that distinguishes one side from the other - both have that coated look. I guess that's why they stick a dot on one side. Anyway, a guy at Strong said the dot goes toward the lamphouse -- although I got the feeling he was guessing the same as me (these are not Strong filters, unless Strong bought up ORCON).

So the new filters that have the dot -- that's fine, but now I am anxious about the other lamphouse -- those filters have no dot an no distinguishing coating -- like I said, both sides look identical. How to tell which way they go? I suppose I could stick a heat probe in the gate and see which side reduces the temperature the most. Seems like that's a lot of work when the company could have easily etched THIS SIDE TOWARD LAMP if it were THAT critical.

| IP: Logged

Phil Hill
I love my cootie bug

Posts: 7595
From: Hollywood, CA USA
Registered: Mar 2000

posted 07-26-2002 02:23 AM

Hmmmmm...although I have never seen it, I suppose it is possible to coat both sides of the glass...why? I don't know.

The idea is that the IR coating reflects the heat back away from the film without going through the filter "glass". In higher-power lamps (7kW, 10kW, 12kW, 15kW, 20kW), if the heat is reflected through the filter glass, it will overheat and crack the filter.

Most times the "hot" or lamp side is somehow marked. That is the dot or the arrow or the "Towards Lamphouse" sign.

Sorry, that's all I know....

>>> Phil

| IP: Logged

Jean-Michel Grin
Expert Film Handler

Posts: 222
From: Geneva & Lausanne, Switzerland
Registered: Jul 2002

posted 07-26-2002 02:43 AM

Just have a look on this service bulletin from Strong int. Maybe this can help you... http://www.strong-cinema.com/bulletins/service_bulletins/SB-0013.pdf

Good Luck !

------------------
Jean-Michel Grin - Europlex Cinemas (Switzerland)

| IP: Logged

Pat Moore
Master Film Handler

Posts: 363

Registered: Mar 2000

posted 07-26-2002 07:54 AM

Frank -- that dot should be towards the lamphouse. Most coated filters, if marked, would orient the mark towards the light source.

That bulletin on our website might help. Touch the tip of a pencil to the glass surface. If the pencil seems to actually contact its image, that's the coated surface. If the image doesn't touch but looks to be about the thickness of the glass away from the pencil tip, that indicates the coated surface is on the other side.

Yes, Strong bought what there was of ORC back in '93, though what we really coveted was the Century Projector line.

Pat

| IP: Logged

Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 07-26-2002 08:02 AM

"coveted was the Century Projector line." And I always thought it was to get the ORC platter design

| IP: Logged

Frank Angel
Film God

Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999

posted 07-26-2002 01:42 PM

Thanks guys. Dot to the lamphouse toward the lamp it is. As for the other lamphouse with the glass that seems to be coated on both sides and no mark, well, it's working fine, the film isn't embossing, so I am leaving it be.

Frank

| IP: Logged

Pat Moore
Master Film Handler

Posts: 363

Registered: Mar 2000

posted 07-27-2002 07:28 AM

Gordon -- I'm hurt. You should know it was Optimax...

| IP: Logged

Gordon McLeod
Film God

Posts: 9532
From: Toronto Ontario Canada
Registered: Jun 99

posted 07-27-2002 08:56 AM

pat said"Gordon -- I'm hurt. You should know it was Optimax"
That is good to know pat I am installing 8 of them of various vintages.
Since you like them so well maybe you can come up here and help align them

| IP: Logged

Richard Fowler
Film God

Posts: 2392
From: Ft. Lauderdale, FL, USA
Registered: Jun 2001

posted 07-27-2002 10:39 AM

The last Optimax we removed from a client's multiplex his staff technician promptly chopped them apart so his boss would not get ideas of recycling them

We did take three of them, threw out the interior parts, built an internal platform to hold a Cinemeccanica light module and reinstalled them in that client's circuit. He could not believe the 100% increase in light output, but then again technology and low bulb costs make this 25 year old concept not necessary.
Richard Fowler
TVP-Theatre & Video Products Inc. www.tvpmiami.com

| IP: Logged

Pat Moore
Master Film Handler

Posts: 363

Registered: Mar 2000

posted 07-27-2002 07:29 PM

Gordon -- sounds like fun, actually, a little different from a normal day. Probably more frustrating, too.

We have done a couple conversions to Horizontal lamps in those consoles using our standard Strong optics. What a difference. It is not a friendly conversion, however.

Pat

| IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.