If you are pullng down a neighbor, it's the power company's problem.
Best bet is to have the NEIGHBOR call the power co and ask them to
install (temporarily) a line voltage recorder. Then run the mill on a
series of heavy cuts. 3 minutes on, 2 minute off, etc. Nice square wave
forms on the recorder will get their attention.

Keep in mind that 2 or 3 volts variation is considered 'normal' by the
power co. You might want to get a good voltmeter, plug it in at the
neighbor's place and see what readings you get.

wrote:

I recently bought a milling machine with a 3hp motor. I purchased a
7.5 hp rotary phase converter and hooked it up to my mill. I have a
100 amp 220 service to my house. Unfortunity I have noticed that when
I first turn the mill on the lights in my shop quickly dim due to
starting of the mill which I understand. My problem is my electric
line is shared with my neighbor then goes to the transformer on the
pole. Another neighbor is also hooked up to the same transformer and
everytime I start the mill the neighbors lights also dim quickly...My
question is due you think I should get the power company to fix the
problem? Do I really need to get a bigger service (200amp) even
though I am only running one machine?

Thanks