If I understand cinematics right?

Hello everybody. This is my first post here, I say hello to all forum.

I think about CNC router, portal XZY. For metal cutting. It will heavy enough, so I plain to use x2 stepper motor for each axis.

I've looked in youtube and google, and completely misunderstand how I have to connect controller driver PSU & motor.

On this video I see just motor & controller & PSU connected to controller.
Rockcliff CNC Stepper Motor Driver - YouTube

But motor so small.

In this forum I've read

Quote:

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stepper motor needs to be powered by at least 20 times the rated voltage. That would be 70V, so 48V would seem to be your best PSU Voltage

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I am looking to something like this

Quote:

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KL34H280-55-4A (1/2" Single Shaft) Specification Price: $89
640 oz In. Hybrid Motor
1.8° /200 Steps Per Rev.
4.5A Amps Current Per Phase ( Bipolar Parallel)
4-wire Bi-polar, NEMA 34 Frame

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What does it means 4.5A Amps Current Per Phase? I have to multiply all phases to get really current consumption?

I have used this calculator
Stepper Motors
with 40% of holding torque because it move.

256 oz*in x 400 rpm = 75watt

If I'll get
KL-600-48 48V/12.5A $129.95
115V /230V

It has 48*12.5=600watt

I need 75*6=450watt

But if I want to get more power motor, may I use this scheme?

http://s017.radikal.ru/i410/1111/2e/c084f6a19f19.jpg

My machine has heavy Y axis with spindle of 4kw about 75 kg (200 lb), two stepper motor have up and down it by Z axis. Of course Z axis used rarely than X or Y.
X axis carries desk made from steel, ~ 120 lb.
Generally I can Use x2 gear or belt system to increase Z load ability.

Thank you forehead.