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Elmo ST-1200 Sound, Magnetic, spindles

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  • #1

    Elmo ST-1200 Sound, Magnetic, spindles

    Hello,

    I have a new issue that has arisen with my Elmo ST-1200 Sound Magnetic projector:

    The forward spindle no longer turns when the projector is put in clockwise/forward play motion but the rear take-up spindle does turn. Conversely, when I put the projector in counter-clockwise/rewind position, the front spindle DOES turn and the rear spindle does not. It seems, as well, that the speed has diminished noticeably in the motor and it has in conjunction caused the bulb to create more of a "flickering" pattern than it has in the past.

    Are there any suggestions as to what I could do to rectify this problem? I am using the projector to digitize audio from super 8 movie reels, so I've been running it at 60Hz in 18fps. For science, I switched it to 24fps, and no different result is observed.

    Here is a video I made to demonstrate the issue.


    Please help if possible!
    Thank you,
    Anna

    https://youtu.be/ctMyJPqywik
    Tags: None
  • #2
    Hi Anna,

    It sounds like your machine is doing exactly what it's supposed to.

    In Forward. The machine draws the film inside itself and the moving film is what turns the forward spindle. The rear spindle must turn in order to load the film onto the take-up reel.

    In Rewind, the front spindle turns to wind the film back onto the supply reel, but the take-up spindle just freewheels. The take-up reel spins because of the film being pulled off of it.

    Did the change to 18 FPS fix your audio?
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    • #3
      Hi Anna....from your description and the video... your projector is running properly. The front feed reel is pulled thru the projector when in forward mode so the spindle will not turn. Conversely on rewind the front spindle is pulling the film back to the feed reel so the rear spindle will not be turned by the motor. As far as the speed issue...have you tried a few drops of light oil on the motor?
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      • #4
        Steve Klare You beat me to the response ... but we are in agreement

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        • #5
          Ah, duh, I'm sorry, that was a dumb question. I have had a million things I've been working on as of late and thought that was the issue that I had been having. I'm sorry! It's ACTUALLY this:

          When I play the film in forward motion, the film so very slowly will feed through the projector, and once it's fed through, I got to play it, and it plays for about 1 second, and then the wheel/motor completely stops. I have to then turn the lamp off quickly so it doesn't burn through the frames.

          I'm so sorry for my mis-diagnosis previously, haha!

          I have not tried any drops of oil on the motor, @Janice Glesser

          Steve Klare, I think it temporarily fixed the issue ensuring that the belt was on the 60Hz sheath. I successfully digitized one reel of audio, but have not been able to get the projector to "play" in forward motion since

          Thank you both!!

          https://youtu.be/wxYnYE9_eOg

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          • #6
            S'okay!

            Most people don't dream this stuff at night like we do!

            I was giving a show one time and some 13 year old asked "if I get NetFlix" on my Elmo sound projectors!

            (Seems he didn't like my content and wanted to change the channel!)

            It sounds like your motor rollers are slipping on the shutter wheel. Maybe if you wiggle the frame rate selector you can seat them better and not lose contact.

            I've had this happen a lot more often than I'd like!
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            • #7
              ​​​​​​Also...when in reverse the film should run just a smooth as in forward. The frames should not be jumping. Possibly it's loosing a loop in reverse.

              Press this button to see if it helps:

              Click image for larger version Name: PXL_20220527_214034081.jpg Views: 260 Size: 50.7 KB ID: 60625

              Click image for larger version Name: PXL_20220527_214053381.jpg Views: 245 Size: 50.9 KB ID: 60626


              Also make sure when you are feeding the film that you first press down the feed lever at the top. Once the film threads into the take-up reel the lower button is supposed to automatically click and set the loop, however on mine I frequently have to manually press it.

              Last edited by Janice Glesser; May 27, 2022, 03:52 PM.
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              • #8
                Originally posted by Janice Glesser View Post
                Also...when in reverse the film should run just a smooth as in forward. The frames should not be jumping. Possibly it's loosing a loop in reverse.
                Gotcha! Yes, the reverse jitter is fairly new, it started to happen a little before the forward motion lost its gumption.

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