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.
Bob Wilson
"Rich" wrote in message
. ..
"JoeM" wrote in message
ink.net...
"Clint" wrote in message
news:ZFDKg.501703$iF6.501568@pd7tw2no...
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
savings.
DAGS for "120v 240v difference", and have fun. 
Clint
"Eric in North TX" wrote in message
s.com...
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.
Running 220 volts cuts the amperage in half.This is an energy and money
saver.
Yes the amperage is cut in half because it's split between two circuts not
because your drawing halve the wattage. The wattage stays the same and
that
is what your paying for.