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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Vic 5 belts squealing

Author Topic: Vic 5 belts squealing Sally Burgess Film Handler Posts: 17 From: New Zealand Registered: Nov 2002 posted 07-29-2006 07:13 PM                     OK, its the inner belt...after taking it off and putting it back on I started the projector and the belt moved over to the far side where it rubs against the back and squeals away. Its giving off lots of brown dust. The top idler is at the right tension. Any ideas?  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 07-29-2006 07:37 PM                     Check the tensioning idler to ensure there is no build up remeber that basic pulley theory a belt will always ride on the crown and that can trhough a belt off  |  IP: Logged William Phillips Expert Film Handler Posts: 117 From: Cardigan, Wales, UK Registered: Feb 2002 posted 07-30-2006 11:40 AM                        Ah, I have seen what happens when a belt gets throwen off the pulley, It can be not a very pretty sight. Ok so this is good one to try and figure out what happened. New belt in a VIC 5 about 6 months ago, correct tension and retensioned after a few days settiling in. No build up,every belt change all pulleys get cleaned. Started a show the other week, fine for about 1 min, join went through on ads, big bang from mech, ghosting on screen. Stopped, opened up the back nothing, Belt tension fine. Changed belt and carried on all well since. Nothing wrong with anything, all teeth on belt, no build up, cross box good and shutter drive. Im still trying to work out what it was. Anyone??  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 07-30-2006 01:53 PM                       The belt skipped a tooth? Were you seeing travel ghost from an out-of-time shutter, or just blurring from film that lost its loop? If it was the belt, the little "keeper" rollers around the shutter and the intermittent gears are critical to preventing skippage - particularly on starts. Note, however, they are not designed to ride on the belt; rather, they prevent the thickness of one belt tooth from lifting off the gears. I set these rollers very close to the installed belt, and then give them only about 1-2mm clearance. Makes for a quieter-running machine, too, and requires less tensioning on the belt.  |  IP: Logged William Phillips Expert Film Handler Posts: 117 From: Cardigan, Wales, UK Registered: Feb 2002 posted 07-30-2006 03:14 PM                        It was an out of time shutter. When I put the new belt in the red dots were a good few teeth apart. The belt containment rollers on my machine are also about 1mm from the belt. Have never had these with a big gap.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 07-30-2006 04:01 PM                     If your belt is fairly new and favoring too far to one edge the tension idler may need in / out adjustment. This can be checked by hand pushing the threading knob after adjustment....NOT under power. The tension rollers are on eccentric studs to allow adjustment and they should be cleaned and lubricated occasionally so they don't freeze up. They are not touching the belt but if they don't roll when touched, they can become dirt traps which could affect the belt.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 07-30-2006 07:58 PM                     Maybe it would be a good idea to check with the theatres engineering deptartment to find out where they want the operator to stop and the field service engineer take over  |  IP: Logged Sally Burgess Film Handler Posts: 17 From: New Zealand Registered: Nov 2002 posted 07-31-2006 12:38 AM                     Thanks guys. I am on tonight so will have another look.  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

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.