| Author |
Message |
Jay
Guest
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 Posted:
Mon Oct 31, 2005 1:35 am Post subject:
sci.electronics.misc , alt.electronics , sci.electronics.bas |
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Hello. This is my first post to any type of group. Thanks for sharing
your knowledge. I know very little about electronics so I need your
help with a money saving project. I have a 12 volt cordless drill that
has no battery. Since a new battery sells for over $30, I had the idea
of somehow hooking up a homemade 12 volt battery pack made from 10
rechargable NimH batteries. Soldering to the drill's two metal battery
clips would be feasible. Will I run into any problems with
current..etc? Can I also hook this up to a deep cycle or car battery?
I was unsure If I would encounter problems relating to amps...does the
drill's motor automatically o draw only the power it needs?
Thanks in advance.
Jay
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John Popelish
Guest
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| Posted:
Mon Oct 31, 2005 1:35 am Post subject:
Re: sci.electronics.misc , alt.electronics , sci.electronics |
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Jay wrote:
| Quote: | Hello. This is my first post to any type of group. Thanks for sharing
your knowledge. I know very little about electronics so I need your
help with a money saving project. I have a 12 volt cordless drill that
has no battery. Since a new battery sells for over $30, I had the idea
of somehow hooking up a homemade 12 volt battery pack made from 10
rechargable NimH batteries. Soldering to the drill's two metal battery
clips would be feasible.
|
If the cells fit in the available space, it should work.
| Quote: | Will I run into any problems with
current..etc? Can I also hook this up to a deep cycle or car battery?
I was unsure If I would encounter problems relating to amps...does the
drill's motor automatically o draw only the power it needs?
|
The only risk from very high available current would be when you stall
the motor. Then the current is limited only by the resistance of the
motor and the internal resistance of the battery. As long as the
motor is turning at a reasonable speed, it generates a voltage that
bucks the battery voltage and keeps the current reasonable, regardless
of how large the battery current capacity is.
You can buy NiMh cells with solder tabs already welded on them.
but at about $3 each, 10 of them will cost you about $30. |
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Joerg
Guest
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| Posted:
Mon Oct 31, 2005 1:35 am Post subject:
Re: sci.electronics.misc , alt.electronics , sci.electronics |
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Hello Jay,
Just one more comment: If you hook it up to a large battery like a
marine deep cycle or a car cigarette lighter plug make sure to install
at least an inline fuse. An automotive parts shop should have those.
There is always a risk that the cable or drill shorts out and you don't
want to see your boat or whatever you are using it on go up in flames.
Regards, Joerg
http://www.analogconsultants.com
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Ian Malcolm
Guest
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| Posted:
Mon Oct 31, 2005 1:35 am Post subject:
Re: 12 drill conversion - Was: sci.electronics.misc , alt.el |
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Jay wrote:
| Quote: | Hello. This is my first post to any type of group. Thanks for sharing
your knowledge. I know very little about electronics so I need your
help with a money saving project. I have a 12 volt cordless drill that
has no battery. Since a new battery sells for over $30, I had the idea
of somehow hooking up a homemade 12 volt battery pack made from 10
rechargable NimH batteries. Soldering to the drill's two metal battery
clips would be feasible. Will I run into any problems with
current..etc? Can I also hook this up to a deep cycle or car battery?
I was unsure If I would encounter problems relating to amps...does the
drill's motor automatically o draw only the power it needs?
Thanks in advance.
Jay
Plenty of boat owners have converted their drills to run off a boat or |
car battery. Use good quality wire that can handle at least 10 amps.
Double insulated wire like mains flex is better for a hand tool as its
more abrasion resistant. It should be long enough to get anywhere on the
vehicle or boat. MAKE SURE the wire is properly secured at the drill
end. At the other end fit a cigarette lighter plug fused at 10A and also
make up a short lead with a couple of battery clips, a 10A inline fuse
and a 'free' (cable mounting) cigarette lighter socket. Get the
polarity right. Cigarette plugs are centre +ve.
If you have an old dead battery, break it open and fit the cable using
it at the drill end. That way you can still fit a good battery later
when you need it too far from the car/boat.
For anyone else, the drill to be converted needs to be 12 V or 15 V.
(Some people have over-powered slightly lower voltage drills
successfully - NOT RECCOMENDED)
--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk [at]=@, [dash]=- &
[dot]=.
*Warning* SPAM TRAP set in header, Use email address in sig. if you must. |
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Jay
Guest
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| Posted:
Mon Oct 31, 2005 7:41 am Post subject:
Re: sci.electronics.misc , alt.electronics , sci.electronics |
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Hey! Thanks guys for your quick and excellent answers. Don't throw
away your old cordless drills |
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