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» Film-Tech Forum   » Operations   » Film Handlers' Forum   » Best way to measure film tension in feed/take up system

   
Author Topic: Best way to measure film tension in feed/take up system
Anhtu Vu
Film Handler

Posts: 76
From: Montreal, Quebec, Canada
Registered: Jun 2013


 - posted 01-31-2018 08:12 PM      Profile for Anhtu Vu   Email Anhtu Vu   Send New Private Message       Edit/Delete Post 
We are finishing putting together two projectors for our archive department.

I need to measure the film tension in the feed or take up reel and measure the tension necessary to move the film through the projector gate with a dynamometer. Any suggestions ?

Our goal under normal operating condition is to to have a tension between 6 - 16 oz-feet.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12134
From: Annapolis, MD
Registered: Dec 1999


 - posted 02-01-2018 05:03 AM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
Use a spring scale.

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David Boyd
Film Handler

Posts: 17
From: Edinburgh, Midlothian, UK
Registered: Sep 2008


 - posted 02-01-2018 10:46 AM      Profile for David Boyd   Email David Boyd   Send New Private Message       Edit/Delete Post 
Here are some we use, should be easy enough to obtain online in the USA. They range from N (Newtons) to e.g. 100g, 500g and 1kg - not sure how that equates in Imperial measurements.

Cant seem to attach a picture, but you get the idea.

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Richard Fowler
Film God

Posts: 2389
From: Ft. Lauderdale, FL, USA
Registered: Jun 2001


 - posted 02-01-2018 03:36 PM      Profile for Richard Fowler   Email Richard Fowler   Send New Private Message       Edit/Delete Post 
Chatillon LP36 push / pull scale 0 to 36 oz in 1/4 oz grauation.
There is a more expensive 516 unit but the LP36 should do the job.

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