Question about Saws

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Saw has lost cutting power

New scraping noise when I turn on the saw, and the blade slows down and stops when I begin cutting wood. Seems like some kind of clutch failure.

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  • hwhooperjr Oct 08, 2009

    Blade path is clear and the tension seems OK. Motor sound is normal, it does not slow, and the belt tension seems normal. The motor and belt continue to spin even though the blade slows to a stop. With the motor off, the drums and blade turn easily. The problem seems to be in the shaft that connects the pulley to the bottom drum. I assume there is some type of clutch in the housing, and that is where the scraping sound is coming from.

  • hwhooperjr Oct 08, 2009

    Thanks. I'll let you know how it turns out.

  • hwhooperjr Oct 17, 2009

    Just a follow-up.
    Finally turned the saw over today, and the pin holding the pulley to the drive wheel shaft was gone. The set screw had backed out allowing the pin to slip out. After sifting through a couple of inches of sawdust, I was able to recover the pin and tightened the pulley back in place.

    Running like a top!

    Thanks for the insight.

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Open the side cover and inspect the blade path and blade tension. Rotate the blade by hand looking for interference at any point. Make sure the drive pulley is not slipping on the shaft and that the belt is not loose or badly worn. Make sure the two large drums that carry the blade turn easily (dry bearing?). Does the motor slow down? Are the drum rim surfaces (rubber) in good shape? If the tension device is at limit, but not tightening the blade, the blade may be too long.

Posted on Oct 08, 2009

  • drallim Oct 08, 2009

    Band saws don't use any kind of clutch that I'm aware of. Look for a loose mounting of the drive shaft to the lower drum--maybe a sheared key between the shaft and drum. Remove the blade and enough housing to get at the lower drive. I'm sure that the answer will be apparent when you get that far into it. If you can't buy parts for it, you may need to seek the services of a machine shop to repair a damaged shaft or drum center. It could be as simple as tightening a clamp nut. Good luck!

  • drallim Oct 18, 2009

    A strong magnet would have helped with the last process. It's good to see people try to repair their own things than to just chuck it in the trash and buy another. Be sure to tighten the set screws on the motor and the saw drive pulley. Thanks for the feedback!

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7c68409.jpg

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