I've run a 14 volt drill with a 12 volt battery....has anyone
run an 12 volt dewalt drill with an 18 volt battery....I have
two 12 volt drills but would like to use the more powerful batteries.
Right. I've run double and triple the rated voltage on DC drills. I've
abused them terribly and almost never burn up a motor because of it.
If you check the motor manufacturer's specs you will see that the
motors are rated for quite a range of voltages. If you have a source of
donor parts or the drill in mind is expendable, then have fun and go
for it. Custom made tools are great.
I doubt that for those voltage (6 to 18 volt) the electronics should not be
a problem. The motors and electronics may well be the same for all units
from a given manufacturer. And the electronics doesn't amount to much of
anything anyway. Not even as involved as variable speed AC motor drives.
I just checked a 12 volt typical drill. The "electronics" consistes of a
switch and an RFP50N05 (50 Ampere, 50 volt, .022 Ohm, N-Channel Power
MOSFET). So it will work with anything up to 50 volts and 50 Amperes.
So if you want to go to a larger battery and are still worried about blowing
something open it up and take at look at what is used inside. Wonder
where I can get a 40 volt battery to put on it???
LOL! That's ALL that has to dissipate any power? Whooooo,
woooo! Great discovery, Tim!
Now tell me this: what is the maximum core temp rating for any
of the windings? Or the commutator max current? These guyys
need to go do some research. Badly!
You got that right. And since engineers design to limits, it's
pretty UNlikely a 12V unit has 18V components. Nine to 12 maybe,
but not 18. These guys must be loved by the battery and
replacement parts shops, or they use their equipment a few
seconds at a time once or twice a year.
Then, even IF the components can live thru 18V vice 12, it's a
pretty sure thing the motor/stator windings weren't designed to
dissipate that much heat. Sooner or later one of these guys will
set the drill down after a prolonged session, the core temp will
work its way out thru the windings, and drip possibly flaming
plastic or winding cement onto the bench, and start a fire with
it, and then blame the manufacturer for their house burning down.
Way too many people think batteries are "safe" and that they
never heat up. The best part is the failure of a 12V while it's
on an 18V charger; it's usually a pretty site, at first. When a
battery core's max temp is exceeded, it almost always explodes or
vents with great gusto, especially the types used in power tools.
If you want to see a really pretty site, try a lead-acid on a
bigger charger; it's prettier yet, all that carbon to burn off.
Watch someone come back and say those batteries can't vent
'cause they have no vents <g>.
Don't drink & drill.
On 1 Feb 2005 07:10:51 -0800, firstname.lastname@example.org wrote:
They are likely throw aways anyway, so if they fit, have at it. It
will NOT likely harm your battery.
This morning, I took one of my 16.8 volt drill batteries apart and
found the bad cell and replaced it with a cell from a 9.6 volt battery
(which I had trashed because it had a bad cell also). It works
wonderfully, even if the battery was smaller in physical size than the
I have found the batteries to be too inconvienient to use, regardless
of the voltage. So, I went out and bought a new Dewalt and wired it
directly to the 120v house current. I also built an adaptor for it so
that it runs on 240 for those really tough jobs.
Folks, Matt and Ransley here just might be dumb enough to plug therir
DC drill into the AC socket or an AC transformer, but trust me it will
blow your circuit breaker very fast. Sometimes it will blow so fast
that the drill will survive it.
You can use an AC step down transformer that will put out 10 amps or
more, but that's expensive unless you already own one. A DC drill
operated in this fashion has no where near the power (watts) of a low
cost AC drill with a cord. There are ways to beef up your DC drill.
However, don't listen to these fools. They have not done anything
WHAT you mean my 3.6v B&D cant take 440 AC so far it works great ! Gee
Ive got 3, 220 - 110 transformers from Europe and I was just going to
inline one more for 880v AC. Aw I gonna try it anyway an 880v ac B&D
Howabout an 880v coffemaker , makes a pot in 6 seconds flat. And my
slow ceiling fan, yep 440 just might do it there also.
I agree. Folks, don't listen to this 'professor' guy - the only thing
he can safely profess is that he is a dipshit. EVERYONE knows that
there is no real difference between AC and DC - that whole thing was a
conspiracy to defraud the public. Your power tools, coffee makers, TVs
, stereos, ALL OF IT - will run longer, faster, and better on 880v +.
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