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two projectors-one print? 06 Dec 2001 09:48 #21110

  • Mike
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WE thought about running the one print of harry through our two projectors at once to show it on two screens. It seems like if there's a fractional time differential in the shutter speed unnoticeable to the eye it would still catch up with you as the one proj pulled faster or slower: either way: trouble. Anyone do this? Is it worth it?

Mike Hurley
www.bigscreenbiz.com
Michael Hurley
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Re: two projectors-one print? 06 Dec 2001 10:37 #21111

  • John Pytlak
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For interlocking, the two projectors must run at EXACTLY the same speed. This requires the use of syncronous drive motors, which "lock on" to the power line frequency. Some installations even still have selsyn motor interlock, from the 3D days.

Consider asking Warner Bros. for a second print, as some may be available.

John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: two projectors-one print? 06 Dec 2001 12:15 #21112

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I figured it wasn't that easy! Thanks!
Michael Hurley
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Re: two projectors-one print? 06 Dec 2001 12:46 #21113

Actually I interlocked three one time that were not interlockable. I had no trouble with the motors as long as had had enough slack with the rollers there was no problem.

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Re: two projectors-one print? 06 Dec 2001 13:41 #21114

  • John Pytlak
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Caution: with induction motors, excess drag or slip in the mechanism may cause the projector to run a few percent slower than normal. Even only 1-percent slower means a difference of 108 feet in a 2-hour movie! --- most slack roller systems won't handle that kind of difference. Syncronous or selsyn motors are needed to be sure the projectors are running at EXACTLY the same speed.

John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: two projectors-one print? 06 Dec 2001 16:14 #21115

John
I am pretty sure these were all sync motors because none of them got ahead or behind of each other. all 16 projectors in the booth were the same model some were just electronically set up for interlock and others were not.
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Re: two projectors-one print? 11 Dec 2001 11:14 #21116

A sync motor will be either 1800 RPM or 3600RPM
A induction motor will be 1725RPM

I would never recomend to anyone not using a sync motor with interlock operation
Even with sync motors a slack loop absorber is needed to allow for the different ramp up characterisitics of each machine
All new North American projectors are sync as standard
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Re: two projectors-one print? 11 Dec 2001 18:57 #21117

Checked the Film-Tech manuals and couldn't find anything, but would anyone have an instructional document on how to interlock?

Could anyone make one with diagrams. What do you do with the platters, etc.

Any help would be appreciated!



Enjoy The Show!

Andrew McCrea
Grand Cameo
Since 1987
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Re: two projectors-one print? 12 Dec 2001 09:48 #21118

Andrew check you e-mail
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Re: two projectors-one print? 12 Dec 2001 17:42 #21119

Thank-you so much, GTEntertainment. I'll e-mail you back a little later with a question, but right now, I must do homework!

TTY L8R



Enjoy The Show!

Andrew McCrea
Grand Cameo
Since 1987
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Re: two projectors-one print? 18 Dec 2001 14:54 #21120

  • John Pytlak
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For a bit of fun, download "Interlocking 101-A 16 screen interlock demonstration" in the "Videos" section of Film-Tech:
http://www.film-tech.com

Although it can be done, I don't recommend it be done on a regular basis!

John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
John P. Pytlak, Senior Technical Specialist
Customer Technical Services
Entertainment Imaging
Research Labs, Building 69, Room 7525A
Eastman Kodak Company
Rochester, NY 14650-1922
Telephone: +1 585-477-5325 Fax: +1 585-722-7243
E-Mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it
Website: http://www.kodak.com/go/motion
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Re: two projectors-one print? 18 Dec 2001 16:55 #21121

Mr. Pytlak,

I have a copy of that on my lap top desktop!

Unless you have 16- 50 seat auditoriums, you wouldn't need to interlock that many screens, I hope!




Enjoy The Show!

Andrew McCrea
Grand Cameo
Since 1987
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