This is topic Wrap detector for Strong Platters in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by Joe Redifer (Member # 3) on 09-26-2002, 08:34 PM:
I am having a problem with my wrap detectors for my Strong platters. They work, but it takes at least 30 wraps or more before it trips the switch. I know what you're thinking.... "Loosen the thumbscrew, moron!". Trust me, it is all the way loose. Is there any way to make these more sensitive? Ideally I'd like it to trip at around 10 wraps max. What's the point of a wrap detector if your film can still wrap like crazy?
Posted by Tim Sherman (Member # 569) on 09-26-2002, 09:14 PM:
Maybe you should try taking the spring out of the microswitch. like you would on the microswitch for the payout assembly. I haven't tried this yet but just an idea. And my potts do and did wrap that much right out of the box.
Posted by Paul G. Thompson (Member # 655) on 09-27-2002, 12:15 AM:
I agree with Tim.
Posted by Darryl Spicer (Member # 711) on 09-27-2002, 02:11 AM:
Hmmmmmmm, these wraps surely are not being caused by static. You are using film guard right. 
Posted by Wes Hughes (Member # 981) on 09-27-2002, 03:25 AM:
30 wraps is really not that much. It takes a lot more than that on a Strong platter with bumpers around the brain to even begin to bind and cause problems. If you take the spring out it may actuate too easily...ie, you may have to thread up really slowly (not the projector, obviously, but when pulling the film to and from the platter) to keep the switch from opening. Just guessing though. I don't have any problem with 30 wraps.
Posted by Sean McKinnon (Member # 612) on 09-27-2002, 03:47 AM:
Ive never had this problem actually my problem was they went off to easile when threading etc... My solution is to soak the failsafe in a bucket of film gaurd and if that doesnt work then remove the spring from the microswitch
Posted by Paul G. Thompson (Member # 655) on 09-27-2002, 03:54 AM:
Joe, what kind of pay-out heads do you have in those things?
Posted by Joe Redifer (Member # 3) on 09-27-2002, 04:54 AM:
The wraps are being caused by me turning the payout platter OFF and counting how long it takes before it shuts down. I haven't had a legitimate wrap yet.
Posted by Christopher Duvall (Member # 284) on 09-27-2002, 05:29 AM:
Maybe you could use a spring with more give. Kind of like a compromise.
Posted by Brad Miller (Member # 2) on 09-27-2002, 06:15 AM:
Well Joe, I would assume your platters have the same failsafe that the ones I have been working with lately. Funny yours won't shut down quickly enough, mine shut down too quickly. If a trailer drop is performed using one of those Goldberg collapsible trailer reels, it will run for a couple of seconds and kill power to the platter. The operators have to put it in bypass, wait for it to get going and then turn the switch back to run after about 20 seconds. I haven't had the time to really bother to look at it, because it isn't THAT much of a deal, but I'm betting that changing/removing the spring as well as bending the actuator arm will make them more or less sensitive. My biggest complaint about them is when I personally string up a film. By the time I am at the takeup elevator, the power has shut down. Since mine will allow the microswitch to be tripped for something like 4-5 seconds before it cuts power, I am wondering if there is something in the setup software that I could change to, say 10 seconds. That would certainly solve my problems.By the way, does yours shut down instantly upon the microswitch opening?
Then again, mine are SCDC and yours are Phase Control. Perhaps there is something there?
Posted by Joe Redifer (Member # 3) on 09-27-2002, 10:19 AM:
Mine are wired directly to the variac failsafe switch. When the wrap detector trips, the platter thinks that the elevator has dropped and shuts off the motors. It does not kill power (as the lights are still on, etc). I would assume yours are wired the same way. The newer platters have a wire that comes up to the top of the tree and the wrap detector is connected there, but that wire is still wired directly to the variac switch. Mine let me thread them completely with no problem. And yes, they shut down instantly.I just don't like 30 layers or more of film rubbing against itself.