This is topic Threading loops on Century CCs? in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by John Hawkinson (Member # 1135) on 05-18-2002, 06:08 PM:
I ask this question with some trepidation...I have a feeling that "there's no great answer," but let me ask anyhow.Does anyone have a particular recommendation on how to thread
loops on Century CCs? Our particular configuration (top-to-bottom) is Kelmar reel arms, DTS timecode reader, Century CC, Century R3, Century lower magazine.
Back in the pre-DTS days, I was never really happy with how we ran loops, but "the way we always did them" involved a 1000' reel as an idler in the upper magazine, and running around the main door.
Currently, I can't say I really like any of the options--they seem to need a lot of supervision and seem to tend to shred film. On some level, I know this is the nature of loops.
My current approach is to start the loop at the upper keeper roller of the DTS timecode reader, and exit just after the constant-speed sprocket in the R3, with one hand keeping the film entering the at the top and the other hand mostly keeping it coming off the bottom...
I suppose the ideal thing would be a 5/16" shaft keyed 45-degree angle roller to stick on the upper reel arm and the lower magazine. It would make the loop a fair bit longer, but perhaps could make it run unattended?
Thoughts?
--jhawk
Posted by Rick Long Jr (Member # 541) on 05-18-2002, 08:43 PM:
Running loops on a Century definitely is a pain.If I am just running a loop of RP-40 to quickly check the image I usually bypass the soundhead completely. That is, come off the lower projector sprocket and head back up. Sound loops are more of a pain. Try not threading over the final roller just under the soundhead sprocket. Your Kelmar reel arms should have threaded holes to accept a swivel roller post. You could try to get a couple of those and install them at a 90' angle to the reelshafts. They can also be set up to swivel out of the way.
Posted by Steve Guttag (Member # 268) on 05-19-2002, 08:04 PM:
You say Kelmar reel-arms yet also claim Century magazines...which is it or is it a combination?For loops, I make mine 10 feet in length. I also store them unmade..thus they never get that kink in them form being stored in loop form and rolled small enough for storage. For picture, I omit the sound head, for sound loops, I thread the whole thing. When starting the projector, I hold my finger on the soundhead hold back sprocket until the sound tensioners stabilize and then I often have no problems.
Steve
------------------
"Old projectionists never die, they just changeover!"
Posted by John Hawkinson (Member # 1135) on 05-19-2002, 09:50 PM:
Steve,
Sorry, I thought I was clear in the "top-to-bottom" enumeration. Kelmar upper reel arms, Century lowermagazines. (Originally all Century magazines, but the upper magazines were replaced when the DTS timecode readers went in). 10' certainly seems longer than what I'm used to. I'll give it a shot and see if that works better. I don't have the length I used in front of me, but it was noticably smaller, much closer to the bare minimum physically required.
--jhawk
Posted by Matthew Bailey (Member # 601) on 05-20-2002, 08:17 AM:
If you have a platter, could you jst thread the loop through the rollers on the top & bottom of the platter column?
Posted by Josh Jones (Member # 447) on 05-20-2002, 02:51 PM:
Matthew, most loops are at best, 6 feet. That is not enough to reach the platter tree and back again. besides, he doesnt have a platter.JJ
Posted by Scott Norwood (Member # 30) on 05-20-2002, 03:49 PM:
He doesn't need the platter, just some rollers. Kelmar reel arms are designed to have rollers attached at the top and bottom for platter use. A carefully aligned guidance roller on the upper reel arm might actually be a good option for this situation, but they would still require unnecessarily long loops. I've only seen clusters of 2-3 rollers (intended to give the option of interlocking), but presumably single rollers are available as well.
Posted by Gordon McLeod (Member # 33) on 05-20-2002, 06:19 PM:
Cinemecanica has large aluminum rollers that are keyed to fit right over the spindle of the projector
that is what I use
Posted by John Hawkinson (Member # 1135) on 05-20-2002, 06:43 PM:
OK, Gordon, do you have a part number or other reference?
Thanks.--jhawk
Posted by Brad Miller (Member # 2) on 05-21-2002, 12:45 AM:
John, a standard Kelmar roller without it's shaft will fit nicely on either size shafts on your reel arms. Many older theaters that had extensive interlock setups have tons of these laying around.
Posted by Dave Macaulay (Member # 813) on 05-22-2002, 02:31 PM:
I keep one of the roller arms that come with Strong platters (hardly anyone here seems to actually use them as film guides, mostly the Speco roller arms) plus a large visegrip in the car... there's usually some way I can bend and clamp it so it works. Good backup if I can't find some way to hang the loop on the machine so it runs OK.