Film-Tech Forum ARCHIVE: RCA 1040 getting hot

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

»	Film-Tech Forum ARCHIVE » Operations » Film Handlers' Forum » RCA 1040 getting hot (Page 2)

This topic comprises 2 pages: 1 2

Author

Topic: RCA 1040 getting hot

Phil Hill
I love my cootie bug

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

posted 04-17-2001 01:57 AM

Randy:
Yes that is true about the temperature rise as long as it is within the temperature rating of the insulation of the motor. (Usually rated as "Class")

>>> Phil

| IP: Logged

Harry Robinson
Expert Film Handler

Posts: 155
From: Franklin Tennessee
Registered: Dec 1999

posted 04-19-2001 10:44 AM

The epic of my 1040 rolls on. I think I just over-oiled the motor causing it to heat up pretty bad the other day. I ran another feature a couple of days ago and though it got pretty hot, it cooled down quickly.

The wow problem is proving to be a little more vexing. My flywheel seems okay, but if you look down the length of the projector on the gear side there is a perceivable wobble in the flywheel while it's turning. It's slight but I wouldn't be surprised if it was enough to put that irritating waver in the music tracks.
When I rebuilt this unit I replaced the top bronze gear in the gearbox with a Wolk product. According to John Eickhof some of those Wolk gears are out of round, which could contribute to the problem. Any thoughts on this would be appreciated. I'm just about to the place where I'm ready to go out and buy a rebuilt SH1000. It's a shame because I've put months into this thing.

| IP: Logged

Josh Jones
Redhat

Posts: 1207
From: Plano, TX
Registered: Apr 2000

posted 04-19-2001 10:56 AM

Check if the drum shaft is bent. that would cause the wobble. As someone mentioned ealier, 1040's tend to wow because there is no real speed regulation. If the motor had a flywheel on it, this problem would be of less concern.

Josh

| IP: Logged

John Eickhof
Jedi Master Film Handler

Posts: 588
From: Wendell, ID USA
Registered: Jan 2000

posted 04-22-2001 01:20 AM

Harry, make sure the projector head is free turning, if it has binds this can cause oscillation to transfer back to the sound drive sprocket thus the 'wow' will happen!
A simple test is to remove the projector completely, then make a loop of film about 2 feet long, thread it through the soundhead from the top, close the lateral guide roller and start it up, then once the flywheel is up to speed, look at how the loop is 'floating' between the sound drum and the sound sprocket
(upper one in soundhead) if it is steady and no bouncing or movement, then it would appear that you have a problem with the projector binding or surging the upper sprocket shaft as it runs. Under normal circumstances, a super head can easily bee turned over by hand
on the main steel drive gear in back, if you can not turn it easily, or it binds at some point, then a good dis-assembly and wash with kerosene is in order! Also, look for a bent
intermediate or main drige gear shaft...as for your sound drum shaft, remove the flywheel, take a dial indicator and attach it to the soundhead casting, then apply the finger to the shaft, set to zero, then slowly rotate the shaft 360 degrees from the drum side and see how much 'run out' you have, .001" is normal, then do the same on the drum surface with the dial indicator attached to the soundhead frame, it should be no more than .0005" run out, if it is more, the drum
shaft needs to be replaced... Good luck!!

------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com

| IP: Logged

Harry Robinson
Expert Film Handler

Posts: 155
From: Franklin Tennessee
Registered: Dec 1999

posted 04-22-2001 01:07 PM

John, I may have mis-stated the problem slightly. I think what I'm experienceing is more on the orderof a "quaver" in the audio than an actual wow. It is unoticable on dialogue, but shows up mainly in lagato string or french horn parts. It sounds like they have a little added vibrato. I made a wave file of the sound by feeding the output from the projector straight into my recording software, then burned a CD. If you'd like to hear it I could e-mail a sample of the sound to you.

| IP: Logged

Josh Jones
Redhat

Posts: 1207
From: Plano, TX
Registered: Apr 2000

posted 04-22-2001 03:28 PM

Send me the file as well.

you have my address

Josh

| IP: Logged

Jeff Stricker
Master Film Handler

Posts: 481
From: Calumet, Mi USA
Registered: Nov 1999

posted 04-22-2001 05:19 PM

I believe fast fluctuations are termed "flutter". Similar cause - something preventing uniform speed of the film past the sound pickup.

| IP: Logged

Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000

posted 04-22-2001 07:40 PM

Harry, after listening to that machine over the telephone, and the little backlash test you did, I think they machine is in need of work. Sounds like the projector might have a bent shaft somewhere.

But what puzzles me is the shutter shaft backlash turns into a slight bind when the movement starts the pull-down cycle. This does not make any sense. If all shafts ran true, the backlash will be the same - no matter what position it is checked at.

That's why I posted this - maybe some of the other pro's who rebuilt Supers can give me a clue. The last Super I overhauled was 26 years ago, and I remember almost nothing.

I suggest pulling the movement and see if the bind is still there. If it is, I would suspect a bent shaft in the gear train, or a gear is going "Wooga Wooga Wooga" instead of running true. (how else can I explain the the "wooga" thing, other than a noise it makes when it is wobbleing around on the floor before it falls flat...)

P.S. - I think we discovered one of the reasons why the motor was running so hot. There is a definate bind in that machine.

| IP: Logged

Randy Stankey
Film God

Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99

posted 04-22-2001 11:17 PM

No, Paul, I think "Wooga Wooga Wooga" was a right-on explanation!

It COULD have gone "Chick-a Chick-a" or it could have gone "Thumpity Thumpity". I (and I think most others) knew almost exactly what you meant.

Someday I'm going to make up a "Projectionist's Dictionary" that explains all these things. Kinda' like the one that they had in Film Notes a while back except that it explains more of the "Wooga's" and the "Klunks". These are the hardest things to debug when people call you and tell you the projector is making a "Funny noise".

I often find myself feeling slightly embarrassed when I have to ask them, "Is it making a WOOGA WOOGA or is it making a THUMPITY THUMPITY sound"?

| IP: Logged

Paul G. Thompson
The Weenie Man

Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000

posted 04-24-2001 06:21 PM

Randy, from what I heard of Harry's machine over the telephone, it has those, too. I think his Super Simplex has seen it's better days.

| IP: Logged

John Eickhof
Jedi Master Film Handler

Posts: 588
From: Wendell, ID USA
Registered: Jan 2000

posted 04-24-2001 10:33 PM

Harry, could you record the sound of the Super as it runs? My experience has always shown the Super, when in good repair to be a very quiet running head, even with film in it! Normal sound is only a whirr of the shutter blade! You can hardly hear the film being pulled down! It appears your picture head may be the trouble! I ran a pair of Supes that were so quiet, that I actually had both machines running at the same time and didn't know it untill it was changeover time and I discovered I had no film left in the machine I was going to changeover to! (The Owner's son [6 years old] had bumped the motor switch on after I had threaded the machine!!! That's how quiet a Super can be!!

------------------
John Eickhof President, Chief Slave
Northwest Theatre Equipment Co., Inc.
P.O.Box 258
Wendell, ID. 83355-0258
208-536-5489
email: jeickhof@nteequip.com

| IP: Logged

All times are Central (GMT -6:00)

This topic comprises 2 pages: 1 2

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.