In message , Ralph E
Lindberg writes
In article ,
"CW" wrote:

"mac davis" wrote in message
...

.. just a jumper change and plug it into 220v.. and add
1/4 HP, supposedly..

That's a myth.

Or not.... See Teknatool's own comments
http://www.teknatool.com/products/La...a%20_DVRXP.htm

OK without going into a deep explanation, a simple basic explanation. (
and remember its been over 25 years since I learnt this, so I have
probably muddled it quite a bit )

Wire resistance produces a volt drop over a known length of wire. Wires
have limited current carrying capability (hence fuses), but not
voltage.

This is why overhead power lines carry power at say 400000 volts to
allow for volt drop If they carried 220Volt there would be arguably 1
Volt if your lucky by the time it gets to your house, so not much power
on a 100A fuse

Automotive systems use 12V but in the past some used 6V, the power
rating for a Battery on a 12V system is double that of a 6volt system
but no change in physical size. Hence why they are researching higher
voltage 72V systems, more power same space (all this onboard
electronics)

Now assume 30 volts were lost in the lathe motor due to volt drop
starting with 110 will give 80 but starting with 220 will give 190 190
is 2x80

so for 1amp using VxI 80x1 = 80W 190x1=190W

I know this is a very basic, but hopefully this simple explanation will
point you in the right direction
--
John