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Thread: Jet variable speed - issue with speed/gear sensor

  1. #1
    Join Date
    Jun 2010
    Location
    Leawood, KS
    Posts
    42

    Jet variable speed - issue with speed/gear sensor

    I have a 1221vs lathe. The other night it was acting wonky with regards to the rpms. When I had it in high gear, the RPM range reflected it being in Mid gear. When in mid gear, it acted like it was in low gear. This behavior was intermittent.

    The manual says to check electrical voltage if the rpm displayed is too low. Checking tonight, it shows fine but I'm also not able to get the lathe to repeat its bad behavior. We've also never had electrical issues in the house.

    The lathe is less than 6 months old with very light usage.

    Anything else that could cause the wrong rpm range or display?

  2. #2
    Join Date
    Jan 2012
    Location
    Roseville,Ca
    Posts
    455
    6 months old? I’d call Jet customer support.

  3. #3
    Join Date
    Oct 2010
    Location
    Mountain City, TN
    Posts
    573
    Have you tried tapping on it with a small mallet while it is running, to see if the problem comes back? I've seen many loose wires cause intermittent problems.

  4. #4
    Join Date
    Jan 2020
    Location
    Hoschton, Georgia
    Posts
    116
    How does it know which gear you're in? There is probably a loose sensor or bracket flapping around in there somewhere.

  5. #5
    The RPM readout on this lathe comes right off the spindle, the machine isn't aware of what pulley you're using. If you peek inside the headstock you'll see the an electronic sensor mounted right by the pulleys.

  6. #6
    Join Date
    Jun 2010
    Location
    Leawood, KS
    Posts
    42
    I spoke with Jet support this afternoon. They're shipping me out a replacement part or two for the lathe.

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