Member postings for Adrian Mann

Looking at your motor plate you could easily convert you Bridgeport to run off a single phase 240v to 3ph 240v inverter. However doing this requires a major re-wire as you need to remove contactors, reversing/changeover switches etc to use a VFD.

Now I’ve done that to my machines as it’s cheaper than getting a 3phase supply but for me it would be a waste of money doing this if you are definitely getting a 3 phase supply.

If you go down the single phase route you do need a reasonable sized single phase supply e.g. my workshop is fed by a 45 amp supply and my machines are fed from a 32amp breaker and obviously i couldn’t turn on/run all of them at once!

I can also recommend “Inverter Drive Supermarket”

No need to buy an inverter one size larger than than the motor rating.

Inverter should be installed in an enclosure (would not pass any electrical inspection if this is not done as swarf fingers etc can touch the live 3phase terminals).

To avoid the cost and hassle of an enclosure I bought a IP66 rated inverter when I converted my Bridgeport mill and Colchester bantam These inverters are slightly more expensive but as they and waterproof you don’t need the enclosure. Also no need to worry about swarf or coolant getting on the inverter.

Use screened cable and correct glands between the inverter and motor (SY cable)

If your not competent with electrics get someone who is to wire it up for you