[Bob La Londe]

I have two 110V .8kw VFDs and they work fine, but I calculate loads for the spindles at 0.1hp or less. My concern was RPM (24K) and higher feed rates for micro mills in aluminum.

I also have one .75kw VFD that supposedly converts from 110V to 220V for a 220V 3phase spindle. I use it with a 220V .8kw spindle and again try to calculate loads at around 0.1hp or less. Works great for me.

Sometimes I will run heavier loads, but the mills scream so loud when I do that it sets my nerves on edge. I try to run light fast cuts for everything I can.

Since I have 220 wired to several places in my shop now I would not design a 3phase spindle machine around 110V unless it was something I was going to sell.

[Goemon]

I have two 240v Nema 10-30r outlets near where I plan to use the machine. I am not really sure how VFDs are wired up but I am assuming that they either come with some variant of a 3 pin 240v plug, or they have exposed terminals for user to connect their own 3 pin plug cables. I'll use these outlets initially.

My interest in being able to use 110v outlets is just for flexibility. I am building my machine base on wheels so it can be moved. I won't sacrifice performance for flexibility though. I'll skip the 110v VFDs.

If there is a scenario where I have to use it with a 110v outlet in future, I will buy a 5000w step up / step down transformer. I have been told that this is a more reliable method of up-regulating a 110v current to power devices that require 240v. Apparently, if I buy one rated at least twice the watts I plan on using, it will be reliable.

most of the quality transformers have voltage regulators and surge protectors built in so there should be no risk of damaging the spindle. I am curious to see how well they can convert 110v to 240v. Am I correct in thinking that there would be no loss of power when using a quality transformer?