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Thread: Balky bandsaw

  1. #1
    Join Date
    Feb 2012
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    Unhappy Balky bandsaw

    After I change my bandsaw blade, I ran a piece of MDF through it as a test, and it was fine. Then I tried to do it again, and the blade didn`t move, although the motor was humming. Then the breaker tripped. So I took off the auxiliary table, then opened up the bandsaw looking for the problem. Nothing seemed to be amiss, so I tried to run the saw again, and it ran. Put the saw back together, tried to run it, and it froze. In a burst of brilliant inspiration, I turned the motor pulley half a turn, and the motor ran, allowing me to saw some slices off 5" thick oak. However, every time I stopped the blade or at least two out of three times, the saw wouldn't move until I turned the motor manually.

    Any idea what may be wrong, and is this likely to be an expensive repair or replacement?

    Thanks.
    Cheers,
    Roger


    The other member of Mensa, but not the NRA

    Everyone is a self-made person.

    "The thing about quotes on the internet is that you cannot confirm their veracity" -Abraham Lincoln

  2. #2
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    Billings Missouri near Springfield Mo
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    Sound like a start winding fried in the motor.
    A Turn N Time
    Components for John Smith Organs and the Hobby Organ Builder

    Frog Pond Guitars


    Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.

  3. #3
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    I vote, starter capacitor as my first guess.
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  4. #4
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    Quote Originally Posted by glenn bradley View Post
    I vote, starter capacitor as my first guess.
    If it were the start capacitor it just wouldn't start but if turning the pulley a little bit makes it start then that would be a winding as you are moving it from the dead spot in the windings
    A Turn N Time
    Components for John Smith Organs and the Hobby Organ Builder

    Frog Pond Guitars


    Before you criticize someone, you should walk a mile in their shoes. That way, when you criticize them, you're a mile away and you have their shoes.

  5. #5
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    Quote Originally Posted by Jay Caughron View Post
    If it were the start capacitor it just wouldn't start but if turning the pulley a little bit makes it start then that would be a winding as you are moving it from the dead spot in the windings
    Hmm, I'm no expert but, I have had motors that would run fine once nudged but, would not start on their own and the starter cap was blown. Symptom were things like the motor would hum but not move, move a bit forward or a bit backward and lust sit and so forth. There was however, always a hum or vibration to the motor indicating that it was energized. A push of the pulley would start it running. Cap failure was 'open' in one motor and 'shorted' in another. I actually don't know enough about it to speak to it intelligently; just relaying my experience. I probably should have qualified that .
    Any sufficiently advanced technology is indistinguishable from magic.
    - Arthur C. Clarke

  6. #6
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    Another thing blow the dust out of the motor it you haven't done so already.
    "Forget the flat stuff slap something on the spinny thing and lets go, we're burning daylight" Bart Leetch
    "If it ain't round you may be a knuckle dragger""Turners drag their nuckles too, they just do it at a higher RPM"Bart

  7. #7
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    + for Bart, sounds like the centrifugal switch might be gunked up with dust, blow it out good then re try it

  8. #8
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    Agree with Charles that is where I'd start .

  9. #9
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    Bart, Charles and Garry nailed it.
    TEFEC motor. Take cover off, blow dust out and get back to work.
    DAMHIK
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  10. #10
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    OK, thanks. I'll give that a try, although electrical things have a tendency not to go back together when I take them apart.
    Cheers,
    Roger


    The other member of Mensa, but not the NRA

    Everyone is a self-made person.

    "The thing about quotes on the internet is that you cannot confirm their veracity" -Abraham Lincoln

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