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Variable speed cordless drills not variable?

Discussion in 'Electronic Design' started by John Doe, Jul 4, 2007.

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  1. John Doe

    John Doe Guest

    Hey (is for you),

    Apparently all DeWalt variable speed cordless drill owners manuals say
    this:

    "NOTE: Continuous use in variable speed range is not recommended. It
    may damage the switch and should be avoided."

    What's that mean?

    Thank you.

    Here are some specific questions:

    How serious are they?
    Or is that like saying "always unplug your TV when not in use"?

    What is that warning based on?

    Is the switch bypassed when fully pressed?

    Do they mean only when under heavy load?

    Thank you.

    Extraneous information, for what it's worth, this is my intended use.
    I found a 36 V cordless hammer drill made by DeWalt, the bare tool is
    very inexpensive. I already have three 12V 3.5AH Panasonic batteries
    (need to make a battery holder for them). Planning to use that monster
    drill for an in-line skate board/scooter motor. I'm sure it has enough
    power. Even if their warning about variable speed is for real, it
    should still work just fine IMO. A cordless drill fits the application
    well for several reasons (inexpensive, rigorously designed to be light
    weight, two or three speed settings which isn't a gear shifter but is
    usable for varying terrain, and a highly variable clutch to help
    prevent throwing the rider off-balance).
     
  2. It probably means that the PWM pulsing circuit is not
    properly heat sinked, and will overheat if used more than
    intermittently.
    Product failures and returns or in house testing.
    The speed control pulse switching electronics are short
    circuited by a contact when the tool is run at full speed.
    The heavier the load, the sooner the speed control will
    overheat.
     
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