Re: Researching my lathe
- From: "Ken Moon" <kenglyn@xxxxxxxxxxxxx>
- Date: Sat, 18 Mar 2006 18:38:13 GMT
"Prometheus" <noneofyer@xxxxxxxxxxxx> wrote in message
news:cren12pan7iiqio91ov49m0gsp1ohq6kd1@xxxxxxxxxx
On Sat, 18 Mar 2006 07:13:55 GMT, "Ken Moon" <kenglyn@xxxxxxxxxxxxx>===================
wrote:
=========================
Not exactly correct. He said it was a 1 HP motor, so it will probably be
drawing between10 and 15 amps, depending on it's efficiency.
IIRC, it is 11.5 amps per the motor plate.
On a 230 V circuit, it will draw half that amount. If there's a long run
from the breaker to the lathe, that could cause a voltage drop of a volt
or
more.
The line is precisely 50 feet of 14ga. 2-wire romex. Worked out
pretty nicely for the prepackaged bit I got for the circut.
If it causes a drop of more than 2-3 Volts, then the power of the
lathe will be affected. That same power requirement would cause half the
voltage drop on the 230 or approximately 1/4 the percentage of loss as the
lower voltage system, so the power loss is less apparent. If the present
system is a 20 Amp line with wiring rated for that output, and no other
tools, lights, accessories, etc., then there should be no problem.
It's a 15 amp line, to match the 14ga. wire, but it is a dedicated
circuit- even labelled "Lathe" on the panel. :)
But, if
there's a loose connection anywhere along the way, or if's an old house
with
aluminun wire, etc., 230 V is not a bad option. The best thing to do,
(IMHO), is run it as is and see if seems to load down excessively on heavy
cuts. If not, run with it. If it does load down, consider the 230 V
option.
Some facts, some opinion; YMMV.
I figured I'd fill in the blanks above, to flesh things out a bit.
The situation is that I installed the line for the lathe on a new
110v. line (mainly because I had 110v recepticles laying around). I
purchased a 50' roll of 2-wire (w/ground) romex for the new outlet,
and through a happy accident, it worked out fairly exactly as I wound
it through the rafters in my shop. It's on it's own new 15a breaker,
and the service to the house (100amp) is new as of the January before
last.
I stuck with the rule of thumb knowledge of cat-5 cable I had gleaned
in a previous life as a webmaster and assumed that 50' or less of
cable indicated an insignifigant voltage drop- though this is an
assumption without any research on my part.
It doesn't seem to be underpowered- the belt slips long before the
motor stalls, but my main concern is making sure the motor is getting
full power to keep it healthy in the long haul. Any thoughts on
whether the 50' of 14ga. cable is short enough to mitigate any voltage
drop?
The resistance of stranded copper wire is approx. 2.6 ohms per 1000 ft., so
your resistance in a 50 ft run should be .05 X 2.6, or 0.13 ohms. Voltage
drop (11.5 Amps X .13 Ohms) should be around 1 1/2 Volts, not enough for a
big concern, asuming normal conditions in the remainder of the connections,
plugs, etc. If you're pretty close to your supply transformer, you may be a
lilttle above the nominal voltage your power company says you're getting.
One place where I once lived had 125-129 Volts at the wall plug on a regular
basis. Light bulbs didn't last well there. (:-)
Ken Moon
Webberville, TX.
.
- References:
- Researching my lathe
- From: Prometheus
- Re: Researching my lathe
- From: George
- Re: Researching my lathe
- From: Ken Moon
- Re: Researching my lathe
- From: Prometheus
- Researching my lathe
- Prev by Date: Re: Best ebony dye?
- Next by Date: Re: (sorta) gloat
- Previous by thread: Re: Researching my lathe
- Next by thread: Re: Researching my lathe
- Index(es):
Relevant Pages
|
