I'm interested in buying a used VMC, maybe something like a Fadal 3016, Fadal 4020 or Haas VF2. For either of the machines I'm looking at purchasing a year 2000 model, hopefully with all working electronics and controller, and eventually retrofit with Dynamotion Kflop. Unfortunately while all of these machines can fit in my height requirements, I think they may require a bit too much power. All three of those machines have 20hp spindles, and if I get a 20hp phase perfect phase converter the required breaker for single phase is 110-125 amp breaker.
I've managed to come up with somewhat of a solution, which would be to use the phase perfect then go to a step up transformer to step up the voltage to 440V instead of 220v, this would allow me to probably half the amp requirements and ultimately install a smaller single phase breaker (assuming my theory is correct). Even still, I think a breaker of 60 amp (assuming) would be too much for my 100 amp shop service, as I still will need some power to run a 5hp compressor (thinking I want 440v 3 phase for that as well), as well as lights and other tools, possibly simultaneously. I do realize that breakers are sized larger and often times these types of machines are not ran at full load.
My question, is it possible to de-rate the hp of a spindle motor? While this may sound crazy, and being i'm a hobbyist with some manufacturing projects in mind, I would like to have instead of 20hp spindle motor something along the lines of 7.5hp, but will go 10hp max. If it is possible, how exactly would I do it? I'm assuming it would be something in the vfd but I have heard that only newer vfd's allow current limiting. How would I de-rate an older style spindle motor for the types of machines I have listed above, if it is even possible?
I've searched all of the web but perhaps my search terms are not correct, I'm sure one of you intelligent individuals would be able to assist me.
Just so we are clear here, upgrading my service amps is not an option. Also I'm sure the easiest work around would be to get a 10hp spindle motor and 10hp vfd, but that would probably be around the $3000 mark. Would like to see if I can do something functional for cheaper.
Thanks