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Motor brake on cordless power tools?

Discussion in 'Electronic Basics' started by DaveC, Jul 14, 2004.

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  1. DaveC

    DaveC Guest

    On battery-powered power tools, is the "electronic brake" feature simply a
    short-circuit of the p.m. motor when the speed-control trigger is released?
    Or is there some other, fancier braking juju being applied?

  2. ToasterKing

    ToasterKing Guest

    On every powered drill I've seen (including battery-powered), the brake
    is mechanical -- when one lets go of the trigger, the spring allows a
    plate physically connected to that trigger to press against the cam of
    the motor. But you may be talking about something completely different
  3. Hmmm, at what year did your experience start ?
    From mine I have yet to see a mechanical brake on a powered drill, but
    then I have not pulled a modern one down (ie after about 1995.
    Would it also be a place of origin issue since each country has it's own
    standards ??
  4. DaveC

    DaveC Guest

    What kind of brake *have* you seen on drills? Do they use motor short-circuit
    for "electronic braking"?
    Please, no Google links. I wouldn't ask a
    question here if I hadn't done that already.


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  5. John Miller

    John Miller Guest

    Consumer-grade drills rarely have mechanical brakes; pro-grade drills
    typically do.
  6. John Jardine

    John Jardine Guest

    Pretty much. My cheapo gets what looks like a 10ohm resistor put across the
  7. James Sweet

    James Sweet Guest

    The decent quality cordless drills I've seen do exactly that, generally it's
    a low ohm resistor.
  8. sparky

    sparky Guest

    What make do you consider pro-grade. I have been involved in repairing
    many makes of commercial drills , both corded and cordless , and have
    never seen one with a mechanical braking system.
  9. John Miller

    John Miller Guest

    Milwaukee, Porter Cable and DeWalt come to mind.
    I don't think that mechanical brakes have been around all that long, but
    even my 9.6v Bosch, which isn't the top of their line, locks up with a
    mechanical brake when the juice isn't flowing.

    John Miller
    Email address: domain,; username, jsm

    Never let your sense of morals prevent you from doing what is right.
    -Salvor Hardin, "Foundation"
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