Ignoramus23708 wrote:

On 2010-08-23, Bob La Londe wrote:
Why are so many big milling machines 3 phase?

Its not about horsepower. I have a compressor with a 5 horse motor that
runs on 120V.

No you don't.

Correct.


All commercial shops have 3 phase.

Incorrect. Most commercial shops have three phase power, but there are
plenty that have to make due with single phase power. These are mostly
shops lucky enough to be located in the middle of nowhere and they get
by with phase converters and VFDs.