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Kelmar RTV-8900: Difference between revisions
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JesseCrooks (talk | contribs) (Created page with "The '''Kelmar RTV-8900''' is a versatile rewind table that can accommodate 16mm, 35mm, and 70mm film, and provides excellent control of motor speed and holdback te...") |
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==Use== | ==Use== | ||
[[File:Kelmar speed control module.JPG|right|thumb|300px|Speed control module.]] | |||
*Never leave the table unattended when rewinding film. | *Never leave the table unattended when rewinding film. | ||
*Limit motor power to 20% during inspection and 30% for rewind when handling archival materials. Never exceed 40%. | *Limit motor power to 20% during inspection and 30% for rewind when handling archival materials. Never exceed 40%. | ||
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===Spindle Detente=== | ===Spindle Detente=== | ||
[[File:Kelmar spindle detent.JPG|right|thumb|300px|Collar holding the spindle detent pin in the drag head. Loosen the lock nut to adjust the pin.]] | |||
When the spindle is inserted into the receiver, a detent pin locks it in position. If the spindle is too difficult to insert or remove from the spindle receiver, or if it slips out too easily, the pressure with which the detent holds the spindle in place can be adjusted. Remove the cover of the head and locate the detente, which is a screw head held in place by a lock nut on the top of the spindle receiver. Loosen the lock nut to free the detente, adjust it to the desired position, and retighten the lock nut. | When the spindle is inserted into the receiver, a detent pin locks it in position. If the spindle is too difficult to insert or remove from the spindle receiver, or if it slips out too easily, the pressure with which the detent holds the spindle in place can be adjusted. Remove the cover of the head and locate the detente, which is a screw head held in place by a lock nut on the top of the spindle receiver. Loosen the lock nut to free the detente, adjust it to the desired position, and retighten the lock nut. | ||
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To align the belt, first make sure the pulley on the main shaft is backed up against the collar that holds the spindle detent, which is always in a fixed position on the shaft. Then adjust the drive pulley to align with the pulley on the main shaft. | To align the belt, first make sure the pulley on the main shaft is backed up against the collar that holds the spindle detent, which is always in a fixed position on the shaft. Then adjust the drive pulley to align with the pulley on the main shaft. | ||
[[File:Kelmar rewind drive belt.jpg|center|thumb|500px|Belt running from drive pulley (left) to main pulley.]] | |||
==Maintenance== | ==Maintenance== | ||
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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]]. | ||
<gallery widths=300px heights=300px mode=packed> | |||
File:Kelmar drag head.JPG|Assembled friction clutch. | |||
File:Kelmar friction clutch parts.jpg|Spring pin, spring, knurled nut, felt pad, and pressure plate disassembled for cleaning. | |||
</gallery> | |||
===Motor Brushes=== | ===Motor Brushes=== | ||
The brushes in the drive motor will wear down over time, and Kelmar recommends that they be replaced when their overall length is 5/16” or less. To inspect the brushes, unscrew the plastic cap on the side of the motor and remove the brush. There is one brush on each side of the motor. | The brushes in the drive motor will wear down over time, and Kelmar recommends that they be replaced when their overall length is 5/16” or less. To inspect the brushes, unscrew the plastic cap on the side of the motor and remove the brush. There is one brush on each side of the motor. | ||
<gallery widths=300px heights=300px mode=packed> | |||
File:Kelmar rewind motor brush cap.jpg|Motor brush cap. | |||
File:Kelmar rewind motor brush.JPG|Motor brush. | |||
</gallery> | |||
===Belt Replacement=== | ===Belt Replacement=== | ||
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Once you have determined that the new belt is working properly, it’s a good idea to open up the head after it’s seen a few hours of regular use. Inspect the belt to see if it’s still clearing the motor standoffs, and look for belt shavings that may have rubbed off from contact with the standoffs. If you have been experiencing issues with the belt hitting the standoffs, you can replace the belt with one of a different color so that the belt shavings will be an obvious indicator if the problem persists. | Once you have determined that the new belt is working properly, it’s a good idea to open up the head after it’s seen a few hours of regular use. Inspect the belt to see if it’s still clearing the motor standoffs, and look for belt shavings that may have rubbed off from contact with the standoffs. If you have been experiencing issues with the belt hitting the standoffs, you can replace the belt with one of a different color so that the belt shavings will be an obvious indicator if the problem persists. | ||
[[File:Kelmar drive head interior.JPG|center|thumb|500px|To replace the belt, disconnect the motor standoffs from the front cover (bottom right), and disconnect the rear bearing of the main shaft from the back cover (top left).]] | |||
==Common Issues== | ==Common Issues== | ||