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Author Topic: Mysterious scratch - how did it happen? Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-21-2006 08:23 AM                     Mike, If the film rubbed against the corner of that tang on the microswitch its just the same as running it against a nail! Mark  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 08-21-2006 09:12 AM                     I used the Kelmar sensor for one multiplex project...all prints scratched in the first week. We installed a bumper ( screw with plastic roller ) to prevent this. This was with dedicated staff of projectionists. We never used that sensor again.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-21-2006 01:54 PM                     Actually the Kelmar Cue Detectors work great and one can shorten that bat to eliminate the problem. Mark  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 08-21-2006 02:07 PM                     So when they replace the switch in the future....they can scratch film again...its a design issue it should be "bat proof"  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 08-21-2006 02:11 PM                     While I agree Kelmar needs to fix this issue, if it really bothers anyone, you can always mount another roller above it to prevent such a thing from happening. On many projectors you can also slide the entire failsafe so far back toward the lamphouse that it makes it damn near impossible to misthread it. I will keep buying the Kelmar failsafes even with this design flaw because they are hands down the most reliable unit on the market. They NEVER miss a cue.  |  IP: Logged Charles Greenlee Jedi Master Film Handler Posts: 801 From: Savannah, Ga, U.S. Registered: Jun 2006 posted 08-21-2006 06:03 PM                        I wish our edge cued speco's were that way. You have to replace the cue after a week or so, or it'll start missing them. I hate edge cueing anyhow. I much liked the ones we had at the Wynnsong, on our Christies, it was a prox. sensor. You could take a peice of black mylar, set the cue on it, and never have to make a cue again, well minus the cues in the credits and after. These black cue segments can be broken down with the trailer sets and used again indefinatly. Though they will eventually wear out. The automation was such that it stepped, and you used knobs to set what each step did. You could do a lens change or close the dowser in mid show if you wanted to. I don't remember the brand or model.  |  IP: Logged

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