Re: [CAD_CAM_EDM_DRO] Home shop power for a big machine

All good comments.
There is an issue with the sheer capacity ... ? can you get, in the US,
for a nominal cost, that much power ?

Thats 12 kW of power, just for this machine. And peak loads are likely
to be the 12 kW.
You would probably need a 18-25 kW service from the power company for
your shops/residence.

Over here, in Spain, it may cost 50k$, and may take 3 months .... to a year.
Depends on where you are and what the feed is in your area.
Two locations next to each other may have different feeds ... and its a
50k$ question.
Something to check with the power company.

For an easy solution, you could get a cheap, second hand large diesel
generator. Industrial.
They are rugged, last forever, and need a noise shield (outside) and
then its solved.
Cheap to run, maybe 1$ /hour. Just an idea.


Jon Elson wrote:

>
> vrsculptor wrote:
> > I was lusting over a big VMC that would never fit in my home shop and
> > got to wondering about power. The machine's data plate says 230 volts
> > 3PH @ 80 AMP's, 18KVA. It has a 15 HP spindle.
> >
> > I could use a rotary phase converter to generate the three phase but
> > don't have anywhere near 80 AMP's available. 18KVA/750 watts equals a
> > 24 HP phase converter.
> >
> > If you where using this machine in a hobby environment and not trying
> > to get production feeds and loads how small of a phase converter could
> > you get by with?
> >
> I think even with 200 A service in a typical home, you are really
> pushing it! The line current into a typical rotaty phase converter is
> going to be REALLY high with a machine like this. If you trip the
> breaker out on the transformer, the power company is going to get QUITE
> nosy about what you are doing. If you have your own dedicated pole
> transformer, you might get away with it. Especially if the local setup
> has a 50 KVA transformer on the pole. If you have a 25 KVA transformer
> shared between 4 residences, you will NEVER get away with it, and you'll
> have a bunch of angry neighbors, too.
>
> It is possible that the machine really doesn't need 3-phase at all. If
> the servo drives are PWM (not phase-controlled SCR) they may run fine on
> single-phaee power. If a VFD is used for spindle speed control, it may
> be able to run off single phase at reduced output.
>
> Jon
>
>
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