8mm Forum: What does the fan cool in a projector?

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Topic: What does the fan cool in a projector?

Pete Richards
Master Film Handler

Posts: 302
From: Australia
Registered: Sep 2010

posted August 15, 2013 07:45 PM

All film projectors seem to have a 'blower' type fan attached to the motor.
Is this for cooling the bulb or the motor or both?

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Winbert Hutahaean
Film God

Posts: 5468
From: Nouméa, New Caledonia
Registered: Jun 2003

posted August 15, 2013 08:19 PM

I don't think a motor needs fan.

If it does, who will cool the fan's motor.... [Big Grin]

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Winbert

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Barry Fritz
Phenomenal Film Handler

Posts: 1061
From: Burnsville, MN, USA
Registered: Dec 2009

posted August 15, 2013 08:32 PM

It is for cooling the lamp.

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted August 15, 2013 08:35 PM

It cools the bulb, it cools the motor and in a sound projector it cools the power semiconductor devices in the amplifier circuitry.

The motor really doesn't need cooling that badly, but just like a lot of devices the cooler it runs the longer it will last.

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All I ask is a wide screen and a projector to light her by...

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Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted August 16, 2013 12:16 AM

It is advised to never move a projector while the lamp is not cool as its filament is more fragile when it's hot.

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Dominique

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Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted August 16, 2013 02:31 AM

As Steve says, the fan helps to keep the whole of the interior of a projector from overheating, even more so with a sound projector with its delicate components.

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Maurice

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Pete Richards
Master Film Handler

Posts: 302
From: Australia
Registered: Sep 2010

posted August 16, 2013 02:48 AM

I was just wondering if it could be removed when using it as a telecine system with a cold light source.

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Hugh Thompson Scott
Film God

Posts: 3063
From: Gt. Clifton,Cumbria,England
Registered: Jan 2012

posted August 16, 2013 10:06 AM

I would think your cold light source is not going to be as efficient
as a mirrored one as used.

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Bruce Wright
Expert Film Handler

Posts: 140
From: Denham Springs, La.
Registered: Oct 2011

posted August 16, 2013 03:24 PM

Hi Pete
Go for it and let us know the results [Big Grin]

!!

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Bruce Wright

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted August 16, 2013 05:50 PM

The bulb is the major source of heat in any projector. They are pretty inefficient: if you are pouring 150W of electric power into an incandescant you get about 135W of heat. It would be great if you were trying to build a heater instead of a lamp!

Without that little furnace in there you could probably get away without a fan.

-Still the same, with a sound machine I'd want to have some kind of fan in there even if just for confidence.

Why do you want to remove the fan, noise?

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All I ask is a wide screen and a projector to light her by...

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