Michele
What has me puzzled is your 3.3KW Domestic Supply. that is a bit less than 15A at 240V
16 A at 220 V, temporarily (1hr) increasable to 18A. And I can't have different supply (for cost reasons).
What is the size of the main breaker in your electrical panel? How many amps at what voltage? Generally in North America we see anywhere from 100 A at 240 V (24KW) to 200 A at 240V (48KW)
If You mean home electrical panel, the main breaker is supplied from italian utility (ENEL) and counter and breaker block is the same for several supplied power, so, I suppose its size is >20A (but even 32) at 220V.
Beyond this point, starts my own plant, that is dimensioned accordingly to supplied current (even over-dimensioned, as I have main wires cross section 10mm^2).
This is then broken down into seperate circuits. Most households use 15A at 110V, but we can also run 20 A at 110V, 30A at 110V etc. Then we have the 220V circuits, 15A, 20A, 30A, 40A, 50A etc. These circuits are wired with appropriate sized wire for the breaker installed, 14Ga for 15A, 12 Ga for 20A, 10 Ga for 30A, 8 Ga for 40A etc.
I don't know Ga as a measure unit. Anyway, in Italy we only have available single-phase 220 V 50 Hz feeeding (from 1.5 to 9 KW, but, from cost point of view the only affordable is 3.3 KW), or 3-phase 220V 50 Hz (that is, each single phase is the same as domestic supply, but in a word is referred to as 380V) with nearly no power limit than the money You are able to spend. There are also industrial alternative, all 3-phase, referred to as 500V, going on up to 3000V (I'm totally not informed about).
For my workshop I generally use a minimum of 20A circuits for both the 110V (2.4KW) and 220V (4.8KW) plugs for hand tool use.
I know that american low-tension current is available at 2-phase 110V 60Hz, and that You obtain 220V by appropriate wiring from the two phases (110 + 110). Italian 220V is different. It's a real single phase, whose wiring scheme has one phase wire (brown or gray or black) and one neutral wire (blue).
My mill is wired to a 220V 50A circuit.
My lathe is run off the RPC and is run on a 220V 3 PH 40A circuit.
So the basic question is, is there any way you can increase the breaker in your main circuit panel to get more than the 3.3KW?
Absolutely not. Otherwise the problem wouldn't exist.
I noticed that the mill you are looking at is 380V 3 Ph.
See above. 380V means 3 sinusoidal phase each one 220V effective tension value.
Now since the other machine is running 220V you will need to be able to increase your voltage to 380V. Will this be possible for you? Can you consider installing a (RPC) Rotary Phase Converter?
What I need to feed this motor is exacltly what I already use to feed my present mill and lathe: an inverter 1-phase (220V) input, 3-phase (we call 380V) output 2.2KW (the biggest -in Italy- available size). Just like the scheme I showed You.
Overall the new machine you are looking at looks like a nice mill and would be worth your while to get going.
The question remains. What is a detailed block scheme of a CNC machine from wich I could understand if my feeding capabilities would be suitable to have it satisfactorily working?
Cheerio.
Walter