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Feb 27 2010

Converting 18v Cordless Drill To Corded Drill, What Power Supply To Use?

Posted by: akka in Black & Decker Drill FAQ, tags: , , , , , ,

It’s a cheap Black and Decker cordless drill, 18v. I would like to know what voltage tolerance it has(can I use a 15v power supply, how about a 24volt power supply?) and would like to know typically how many amps these cordless drills use under full load.
the Batteries are shot basically, and I can’t find a corded drill with the cordless features(torque settings etc.) so I wish to utilize these drills I have laying around, I was looking in catalogs and seems to me a good power supply I can find is a 15v with 10 amps continuous or a 24 power supply.
I hooked the drill up to my ex-tech variable voltage 3amp 0-30v power supply, my current limiter would keep tripping and can only screw a deck screw in about half way….
What would be a good power supply for this application, and I can’t seem to find the watts the tool draws, so I am not sure how big of a supply I need, or the voltage.

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2 Responses to “Converting 18v Cordless Drill To Corded Drill, What Power Supply To Use?”
  1. guru says: February 27th, 2010 at 9:45 pm

    The more voltage the faster the drill will spin until it destroys from wiring flying off the rotor.
    At 18V it probably draws about 10 Amps at stalled condition, maybe more. If you keep it at 10A for too long it will get too hot and destroy from overheating.
    The faster the motor spins, the more airflow = more cooling.
    Drills (electric motors) don’t like low speed high torque. Air tools get fresh air to cool even when stalled.
    Heating is proportional to torque.
    Hope this properly answers your question
    Guru

  2. Technobu says: February 28th, 2010 at 2:25 am

    I’m sure the cost of buying a high- current power supply and the inconvenience of trailing a power lead wherever you go, would easily outweigh the cost and convenience of re- packing your existing battery packs, or buying replacements.
    Or just buy a new cordless drill.
    However pistol mains operated drills with adjustable torque, reversible etc. are on the market.
    The biggest killer of battery packs is the practice of continuing to use a battery even after the speed drops off. The battery should be recharged as soon as it is evident the output is dying.
    Let’s face it. A cordless drill is cordless for the portability and convenience it offers. Nothing else.