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Kelmar RTV-8900: Difference between revisions
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The '''Kelmar RTV-8900''' is a versatile [[rewind bench|rewind table]] that can accommodate [[16mm]], [[35mm]], and [[70mm]] film, and provides excellent control of motor speed and holdback tension. It features a variable speed bidirectional motor, an adjustable friction clutch for regulating feed tension, interchangeable | The '''Kelmar RTV-8900''' is a versatile [[rewind bench|rewind table]] that can accommodate [[16mm]], [[35mm]], and [[70mm]] film, and provides excellent control of motor speed and holdback tension. It features a variable speed bidirectional motor, an adjustable friction clutch for regulating feed tension, interchangeable spindles to accommodate various [[film gauges]] and reel sizes, a built-in light box for [[inspection|film inspection]], and an automatic rewind system. The RTV-8900 comes in a full-size 24” deep version or a slim 14” version. A model with two power heads is also available. | ||
The control unit and rewinds can also be attached to other tables (ex., to replace hand-crank rewinds on vintage rewind benches). | The control unit and rewinds can also be attached to other tables (ex., to replace hand-crank rewinds on vintage rewind benches). | ||
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Run the motor at a low speed and check the alignment. If the alignment seems adequate, gradually increase the motor speed, visually assessing the alignment, checking for contact between the belt and motor standoffs, and observing for any noises or vibrations that might indicate that something is wrong. | Run the motor at a low speed and check the alignment. If the alignment seems adequate, gradually increase the motor speed, visually assessing the alignment, checking for contact between the belt and motor standoffs, and observing for any noises or vibrations that might indicate that something is wrong. | ||
To achieve adequate clearance between the belt and the motor standoffs, it may be necessary to turn the drive head on its side, with the motor facing down in order to use gravity to assist the alignment. However, it is also possible to over-tighten the belt in this manner. If excessive vibration is detected after alignment, the belt may be too tight and the motor may need to be moved closer to the main shaft. If it is impossible to achieve adequate clearance between the belt and the motor standoffs (in addition to being gauged by eye, a lack of clearance will be evidenced by belt shaves being worn off due to contact with the standoffs), the standoffs maybe be filed down to prevent contact with the belt. | |||
<gallery widths=300px heights=300px mode=packed> | <gallery widths=300px heights=300px mode=packed> | ||
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Check periodically for dirt and wear. Remove the knurled nut, spring, and pressure plate. The felt pad is retained by a spring pin, which can be difficult to remove if there is significant dirt built-up. If the pin is relatively loose, a 5/32 Allen wrench can be used to drive it out. If the pin is difficult to remove, it can be driven through using a pin punch. Remove the pin to free the felt pad. Clean the pad as necessary and replace it when worn. The pad can be cleaned with a spray degreaser like 409 or a degreasing dish detergent to keep it clean. Apply the degreaser, rub it in with a cloth to remove any oil, wipe it off and clean it with a paper towel, and rub it dry. Let the pad fully air dry before reinstalling. This should be done once a year if film is run infrequently. Always stock spare felt pads so that a worn pad can be replaced immediately. | Check periodically for dirt and wear. Remove the knurled nut, spring, and pressure plate. The felt pad is retained by a spring pin, which can be difficult to remove if there is significant dirt built-up. If the pin is relatively loose, a 5/32 Allen wrench can be used to drive it out. If the pin is difficult to remove, it can be driven through using a pin punch. Remove the pin to free the felt pad. Clean the pad as necessary and replace it when worn. The pad can be cleaned with a spray degreaser like 409 or a degreasing dish detergent to keep it clean. Apply the degreaser, rub it in with a cloth to remove any oil, wipe it off and clean it with a paper towel, and rub it dry. Let the pad fully air dry before reinstalling. This should be done once a year if film is run infrequently. Always stock spare felt pads so that a worn pad can be replaced immediately. | ||
Clean the spring pin, pressure plate, and clutch plate, and check for wear. If the pressure plate is worn, it can be flipped to use the other side. If the clutch plate worn or pitted, super fine steel wool (#0000) can be used to smooth down the plate. | Clean the spring pin, pressure plate, and clutch plate, and check for wear. If the pressure plate is worn, it can be flipped to use the other side. If the clutch plate is worn or pitted, super fine steel wool (#0000) can be used to smooth down the plate. | ||
Do NOT apply oil to the felt pad. This will attract dirt, and will cause the friction level to drift much faster than would occur due to natural wear on the felt pad. This throws the friction clutch out of calibration and requires re-oiling. An overly oiled pad will also spray oil when it rotates, making a mess and possibly leading to [[print contaminant|print contamination]]. | Do NOT apply oil to the felt pad. This will attract dirt, and will cause the friction level to drift much faster than would occur due to natural wear on the felt pad. This throws the friction clutch out of calibration and requires re-oiling. An overly oiled pad will also spray oil when it rotates, making a mess and possibly leading to [[print contaminant|print contamination]]. | ||