Initiated a new woodworking shop endeavor last week and have "anything
goes" on electrical from the contractor and wonder where the "typical"
power source is for the TS whether 110V or 220V. Currently have 110V
TS and it was plugged into a ceiling receptacle and was happy with
that not having to step over a cord on the floor but inquiring minds
wonder what other alternatives exist. Got the X10 for dust collection
that was utilizing the same circuit and enjoyed it muchly. Small
compressor can use either voltage but will probably convert to 220V
for efficiency. Shop/garage will be 24X30 with 9' ceilings with half
bath and drain board/sink adjacent and 3 windows with 18' garage door
and person door. Anxiously awaiting completion! Anxiously awaiting
It probably depends on how much you use it. I inherited my dads wood
working equipment, and most of it is 220v but, he used it a good
portion of every day, so it made sense to have it on 220v for the
savings on electricity. I will say they are more powerful than before
he made the motor switch, you just can't lug down the belt sander, and
the table saw is like a hot knife through butter. I don't know if he
upped the HP when he made the change, but they are sweet machines now.
AFAIK, there is no energy savings to be had, running 220(240?) instead of
110/120. There may be less voltage drop when running 220, but no energy
DAGS for "120v 240v difference", and have fun. :)
The wattage used by the motor would stay the same, if the voltage to the
motor were the same, although even this is ignoring resistive losses within
the motor. But the phrase "There may be less voltage drop when running 220,
but no energy savings." does not make much sense: The voltage drop amounts
to turning electricity into heat in the wiring, wiring in the building and
in the power cord etc., and it unless you want to count that toward heating
the building it is exactly enery lost, so if there is less of it at 220 then
there is energy saved. There are lots of details if you want to go into
them, such as the back-emf generated by the motor and how that falls off
with load, but overall more of the electricity you are paying for will go
into making sawdust at 220 than
at 110. Going back to the first sentence, note that a different voltage drop
makes for different voltage to the motor, so nothing here is simple.
To continue what Rich said, around here we pay for electrical power by the
kilowatt-hour. Wattage = voltage * amps. So if your tablesaw draws 15 amps
at 120v (15A * 120V = 1800W), it's the same as 7.5A @ 240V (7.5A * 240V 1800W) in terms of actual power used, and therefore cost.
BTW, when replying to (and quoting) someone else's post, it's poor practice
to include the same quote identifier in front of your text. Makes it hard
to pick out what you're trying to say. This is simply my opinion, unlike
some people who will try to what an "Internet Standard" is (regarding
Since the same size wire will carry the same amount of amps at either
voltage, and voltage is what drops as wire runs get longer you tend to get
more power to the motor if you opt for the higher voltage.
Also if you take it to the next step and run the motors on 3 phase power
(assuming it is available) you get a bigger bang for your buck.
About the time I had mastered getting the toothpaste back in the tube, then
On Sat, 9 Sep 2006 00:47:08 -0700, with neither quill nor qualm,
Right, startup torque is higher at 240v, too, so the machine springs
to life a lot quicker.
I missed the original posts, but from this post:
120 and 240v are both single-phase, Roger. He'd have to get a 3-phase
motor and have the utility company put in 3-phase power (usually for
beaucoup additional money IF they do 3-phase in his residential area.)
Vidi, Vici, Veni
http://diversify.com Comprehensive Website Development
It may not be a large difference, but higher voltage transmission lines
will lose less energy to heat than lower voltage ones over distance.
The same could be said for an AC motor winding.
In theory, the power output of a motor running 15A at 120v is identical
to the same rig running 7.5A at 240v, but in practice, this is not the
case. As the load increases, efficiency declines and the motor will
draw more energy from the mains in order to complete its task. the
higher voltage motor will also suffer from this, but to a lesser
degree. This is why you see large scale industrial motors running at
higher voltages (and lower amperages), rather than using something like
120v/50A. I doubt that the savings in electrical cost will be
enormous, but over time it will add up (or subtract up, down, whatever
And the savings have been already lost on the whole conversation even at a
$1/hour we have spent more time on this than the savings! Now I like teflon
tape to seal water fittings.........
LOL Happy Labor Day
I would say most, including me simply, use an extension cord. I have used
an extension cord since 1981. In 1999 I upgraded to a cabinet saw and use a
10-3 extension cord 30' long. I have never tripped over either.
Until I have a larger shop with a stationary and permanent position for the
saw, I will continue using the extension cord.
Can't address the power question, but if this is a 'clean paper' setup and
the slab hasn't been poured yet, I'd tuck a 3x3 shower stall in that half
bath, especially if there is a SWMBO in the picture. If you are doing a big
project and get all sweaty and sawdust covered, they get real cranky when
you track that into the house. If this fancy shop isn't at home, it is real
nice to be able to clean up before meeting people for dinner.
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