Converting cordless devices


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  1. #1
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    Default Re: Converting cordless devices

    Note for the next guy:

    The batteries offer more than cordless feature, they provide a ton of current. LOL

    Plan B: run off a rechargeable battery on the workbench.

    Robert


    Edit: and don't ask me why I can reassemble a complete cordless screwdriver gearbox.
    Last edited by Demon; - 8th June 2014 at 19:12. Reason: new plan

  2. #2
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    Default Re: Converting cordless devices

    Current on this seemingly mild motor spikes at 4.5A on power-up, settles quickly at 1.5A during operation (without resistance).

    A 12V 7Ah battery turns it plenty fast, worried to hurt gearing.

    12V from a PC power supply turns it a bit slower but still too much. I wanted to use a 7808 but they seem to have a max of 1.5A, I need an 8V source than can handle a 5A spike.

    (Googling for 8V NiCD batteries)

    Robert


    Edit: the LM338 can operate at 5A from 1.2-32V with a 7A peak. I'm kinda worried of running a 7808 at 1.5A for an extended period.

    The other thing I can think of is a MOSFET controlled by PWM from a PIC.
    Last edited by Demon; - 8th June 2014 at 23:18.

  3. #3
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    Default Re: Converting cordless devices

    Don't you hate searching for replacements, not finding any at a reasonable cost, so you move on to customizing and then this pops up.

    10 x NiCd 4/5 SubC 1.2V 1600mAh
    Rechargeable Battery with Tab Blue
    $16.16USD

    http://m.ebay.ca/itm/130807945134

    So I could bring life back to all 3 screwdrivers for just over $17 Canadian.

    Robert

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