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Reels: Difference between revisions
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→Reels & film damage
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Unmaintained reels can be a source of [[film damage]]. | Unmaintained reels can be a source of [[film damage]]. | ||
* Reels with center hubs smaller than 4 inches are not recommended for projection (they can cause too much tension to be placed on the film) or for long term film storage (they can cause base curl). | * Hub size - Reels with center hubs smaller than 4 inches are not recommended for projection (they can cause too much tension to be placed on the film) or for long term film storage (they can cause base curl). | ||
*Flange-to-hub ratio - On traditional mechanical projectors, the clutch must be adjusted so that the tension is not too great when the reel is empty and not too slack when the reel is full. To achieve this, reels should have a flange diameter to hub diameter ratio of no more than 3:1. For larger reels, this can be cheated somewhat by using floating hubs because the mass of the flanges is less of a factor during the initial take-up, allowing a lower starting torque. | *Flange-to-hub ratio - On traditional mechanical projectors, the clutch must be adjusted so that the tension is not too great when the reel is empty and not too slack when the reel is full. To achieve this, reels should have a flange diameter to hub diameter ratio of no more than 3:1. For larger reels, this can be cheated somewhat by using floating hubs because the mass of the flanges is less of a factor during the initial take-up, allowing a lower starting torque. | ||
* Inspect all reels regularly to make sure they are true and don't have any sharp burrs that might snag or rub on film. If burrs are discovered, sand them down with 600 grit emery cloth or crocus cloth. If the burr is large, first use a file and then sand down to a smooth finish. Do NOT do this in a film handling area to avoid [[print contaminant|print contamination]]. | * Burrs - Inspect all reels regularly to make sure they are true and don't have any sharp burrs that might snag or rub on film. If burrs are discovered, sand them down with 600 grit emery cloth or crocus cloth. If the burr is large, first use a file and then sand down to a smooth finish. Do NOT do this in a film handling area to avoid [[print contaminant|print contamination]]. | ||
*Dirty or rusty reels - House reels should be kept clean. Shipping reels that are dirty should be thoroughly cleaned after the film has been wound off. Rusty reels should not be used. | *Dirty or rusty reels - House reels should be kept clean. Shipping reels that are dirty should be thoroughly cleaned after the film has been wound off. Rusty reels should not be used. | ||
*Bent shipping reels - For bent steel shipping reels, it may be possible to gently bend them back by hand. If the lip of the flange is crushed or bent, do NOT use tools directly against the metal, which can create burrs. Instead, wrap a piece of felt around the flange and sandwich it between two pieces of cardboard so that the tool does not mar the surface of the reel. | *Bent shipping reels - For bent steel shipping reels, it may be possible to gently bend them back by hand. If the lip of the flange is crushed or bent, do NOT use tools directly against the metal, which can create burrs. Instead, wrap a piece of felt around the flange and sandwich it between two pieces of cardboard so that the tool does not mar the surface of the reel. | ||