Phase converter question

[AirChunk]

Hello!
I have purchases a CNC lathe that is powered by 3phase.
The motor on it is 15HP.

I have 2 pony motors to choose from available to me to make a phase converter from.
option 1 20hp
option 2 40hp

My question is : Would the 20 HP pony motor be enough or should I just go ahead and build it out of the 40 HP?

The converter box for the 40 hp is a bit more expensive ...Money is tight.

Thanks for your help!

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[D.D.Machine]

A lathe draws a LOT of power on startup of the spindle ,,, the mass of the 40 hp would help a lot with that ,,,, I ran a 20 hp lathe off a 25hp converter for years and it work ok ,,, it was hell on light bulbs in the shop on hi RPM start ups.

[AirChunk]

Ahhhh, gotya . the Start up will be the worst part ,huh.
So I should build it out of the 40 hp one.