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Cordless corded tools?

Discussion in 'Electronic Design' started by John Doe, Nov 22, 2011.

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  1. John Doe

    John Doe Guest

    I just converted a Dremel 10.8 V rotary tool to use Bosch 10.8 V
    batteries. I always have the rotary tool immediately in front of
    me, so the battery will either be worn on a neck strap or be set
    down near the work. The wires coming from the rotary tool plug
    into the battery, using a socket taken from another Bosch tool.

    That was done because the rotary tool battery charger sucks.
    Apparently the charger destroyed one of my two battery packs.
    Also, I have lots of Bosch 10.8 V MAX batteries.

    Preliminarily speaking, having the battery connected through a
    wire to the tool is working great. It's a cutoff tool, so maybe
    the fact that it is ultra light without an integrated battery is
    the reason. Or maybe it's just infatuation, wouldn't be the first
    time. The battery pack can be worn around my neck, hung from a
    utility belt, or set on a table (the way I'm doing it now).

    I suppose eventually battery technology will be light enough that
    we will reach the point of diminishing returns for lightness, but
    that hasn't happened yet.
     
  2. Guest

    7.2 volt drills, run on 12 volts, work great for drilling nominal
    1/8" holes for rivets in aluminum. Several friends have built entire
    Zenith (zenair) 701 planes with them.
     
  3. John Doe

    John Doe Guest

    Removing the battery pack and (instead) connecting it through a
    short wire improves the balance of my rotary tool.

    They could probably make an extremely compact and lightweight
    lithium-ion battery powered rotary tool that would function better
    than a flexshaft, that way.
     
  4. Art Todesco

    Art Todesco Guest

    I too, have a rotary tool always next to me, actually 3. Dremel does
    make a Li-Ion battery model ... that's my #3 unit. Actually, it is
    usually my number one go to unit. Its battery and charger seems to be
    ok. I only have 1 battery and have had it for many years. It's
    probably close to needing replacement. This battery unit does, however,
    lack the power a regular AC Dremel possesses. Maybe a new battery would
    improve it. The 2 other units I have, which are always on the bench,
    is a variable speed AC dremel and a Ryobi. When Dremel built this AC
    model, they built pure junk. This model has the variable speed slide
    lever. The tool itself is our of balance so that at high speeds it
    vibrates. It vibrate so bad that the speed lever will move on its own.
    However, I still use it. The Ryobi speed is only 20K max, but has
    much more torque than the other 2.
     
  5. John Doe

    John Doe Guest

    If you have other 10.8 V battery tools (like Bosch 12 V MAX), and
    a socket that can be taken from the same type of tool, you can
    convert your rotary tool into an ultra light weight cutoff tool.
    And likely you will be improving the battery performance at the
    same time. I took the connector/socket out of a Bosch 12 V MAX
    flashlight, connected a 2 foot wire to it, and soldered the wires
    into the rotary tool. I'm going to buy some cheap connectors in
    addition to that, so that I can use the same (expensive)
    tool/battery connector to connect the same type battery to another
    device. For example... For using the bright end of the hacked
    Bosch flashlight on my skating helmet.

    Might be a good time to move away from the cheap charger that
    comes with 8000 series Dremel tools. The only difficulty is
    finding a spare connector for the battery.
     
  6. Guest

    If removing the battery hurts the ballance, fill the battery area
    with Bondo - and lead shot if required.
     
  7. John Doe

    John Doe Guest

    You are a waste of space.
    --













     
  8. John Doe

    John Doe Guest

    And speaking of a waste of space...

    Too bad you cannot at least keep your garbage in all of your
    off-topic threads, instead of letting it seep into everything
    around you.
    --
     
  9. legg

    legg Guest

    You might want to consider adding snubbers or clamps to the switch and
    harness, at the motor. The harness may also radiate.

    RL
     
  10. Guest

    RADIATE? If you are worried about AM radio interference throw a
    ferrite torroid on the cord at the rool end. If your worried about
    something else, don't be - because it is NOT a problem.
     
  11. legg

    legg Guest

    That would depend on the control circuitry and motor combination used
    by the tool, and the voltage of the substitute battery used. There can
    be considerable di/dt, normally handled by the local battery's
    placement. Stick the battery at the end of a cable, you'll get more
    than just DC cable losses - there will be voltage spikes at the load,
    voltage ripple on the controller supply, and rdiation from the
    interconnection.

    I'm not worried. It's not my tool, but you don't paint just one side
    of a fence.

    It IS becoming increasingly difficult to get clean and stable FM
    broadcast reception - never mind AM - particularly from smaller or
    distant stations.

    I expect there are similar problems over the rest of the spectrum -
    with effects not so easily identifiable by the victim. The perpetrator
    is, inevitably, ignorant of them.

    RL
     
  12. Guest

    12 to 24 volt battery operated tools do not "broadcast" very far -
    either from the brushes or the PWM controllers.

    Cheap Chinese line operated power tools are another story altogether.
     
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