Film-Tech Forum ARCHIVE: Century DAW 2 Speed Problem :(

Topic Closed

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

»	Film-Tech Forum ARCHIVE » Operations » Film Handlers' Forum » Century DAW 2 Speed Problem :(

Author

Topic: Century DAW 2 Speed Problem :(

Matt Close
Expert Film Handler

Posts: 226
From: Hervey Bay, QLD, Australia
Registered: Sep 2001

posted 01-07-2002 06:35 PM

After a nice weekend off (doesn't happen often!), I started up cinema 4 on Monday morning to find the trailers running a little sloooooooower than usual...... Panic! ..... Nothing seems to be binding, no belts are slipping, I've tried a different motor, and also tried alternate power wiring to the motor. What 'really' governs the speed of the projector? Please help me guys......

The projector is a Century DAW 2. (Anybody have a manual?)

Matt.

Hervey Bay, QLD, Australia.

| IP: Logged

Aaron Sisemore
Flaming Ribs beat Reeses Peanut Butter Cups any day!

Posts: 3061
From: Rockwall TX USA
Registered: Sep 1999

posted 01-07-2002 09:05 PM

Is this machine being driven with a Poly-V belt or with a cogged (timing) belt? (I am referring to the belt coming off the motor, not the one from soundhead to picture head)

I have had Poly-V belts that get greasy enough to slip enough to affect sound speed when in motion under load, even though they appear to be OK when at reSomething to try if it is a Poly-V machine is to remove the drive belt, and thoroughly clean and degrease (using alcohol, acetone, or hot soapy water) all the surfaces the belt contacts, and replace the belt with a brand new one. If a new belt is not available, try cleaning it in a soapy water solution as best as you can. (Usually the belt will be completely soaked thru with oil and will never become degreased).

If it is of the cogged-belt variety, there must be something either slipping (loose mainshaft gear in the picture head or soundhead drive pulley can both cause this) or there is a problem with the motor or the power getting to the motor (but you did say you had replaced the motor).

Speed on Century projectors is controlled by the size of the drive pulley on the motor or the ratio of the mainshaft gear in the case of the 'M'-series projectors. the centrifugal 'governor' on the vertical shaft is basically there to actuate the fire shutter.

Manual for this is available here on the site. Use the SA manual and follow the parts lists and diagrams for 'double shutter' (DA)

Hope this helps!

-Aaron

| IP: Logged

Mark Gulbrandsen
Resident Trollmaster

Posts: 16657
From: Music City
Registered: Jun 99

posted 01-07-2002 09:23 PM

I'd de-couple the projector head from the soundhead and make sure that it turns over freely. An intermittent that is starting to seize up can cause a Century to slow down a bit(the gearing is oversized and will take it). There could just be too much load on the mechanism for it to get up to speed.The motor will also run hotter than normal as well. Also if you have a Century soundhead that has the bronze type bushings on the main drive shaft this can also get gummy and begin to seize up(not totally at least yet)and cause things to slow down. Remove the motor belt when you check the soundhead. These are both problems I've experienced a number of times.
Mark @ GTS

| IP: Logged

Don Sneed
Master Film Handler

Posts: 451
From: Texas City, TX, USA
Registered: Aug 2001

posted 01-08-2002 06:18 AM

I had this problem several times with the Century soundhead & also the Cinecita projector & soundhead, All the belts was good, dry, ect..the problem was the soundhead sprocket shaft, remove the sprocket shaft from the soundhead, oil the shaft & the shaft housing, the soundhead I had did not have bearings, so I oiled the shaft & housing & the speed was back to normal....the soundhead & projector turned freely before I did this, no bind of any kind, but oiling this parts solve my problem everytime!! good luck !!

| IP: Logged

Joe Grace
Film Handler

Posts: 44
From: Maine
Registered: Feb 2000

posted 01-08-2002 02:47 PM

This happened to me once, but it was because I oiled a belt to get the squeak out (Bad idea, but the squeak was gone). If the gear train seems to be fine then it is most likely the belts or the motor. Have your tried manualy turning the projector over by hand? Do you feel any resistance? Does the motor run hottor then usual? Does the projector run faster with no film in the projector?

Joe

| IP: Logged

Gordon McLeod
Film God

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

posted 01-08-2002 04:51 PM

Also the aluminum pullys for the poly v's can ge so polished with wear they get slippery and the machien will sun slow
I usually use a bit of belt dressing on the poly v belts

| IP: Logged

Brad Miller
Administrator

Posts: 17775
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99

posted 01-08-2002 06:46 PM

Closing this topic because an identical one ("Please guys .... I really need help with this ....") was opened up half an hour later.
Please do not do this!!!

| 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.