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Old 10-28-2020, 05:03 PM
norson norson is offline
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Join Date: Nov 2010
Location: Portland, Or.
Posts: 400
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I was faced with the same issue a number of years ago. My lathe had a 10 hp 440 motoring it also had a 440 lubrication pump. I bought a rotary phase converter KIT off eBay and found a 15 hp motor 220 to complete it. The motors on the lathe were nine wire so I just rewired them for 220. Since then I've purchased a Trumpf CS75 that is also 440, but with the main motor being a three speed and having two other motors plus ton of the electronics, I decided to use a transformer to adapt the 220 line to the 440 machine. I use VFDs on my Lennox nibbler and Bridgeport mill. I have several other 3 phase machines so the RPC is really necessary. I ended up not assembling the original RPC because I found a completed one on Craig's List with motor for $300. Still have the original if anyone needs it.
In my research I found that a 5hp RPC would power a 3hp motor, a 7hp RPC would power a 5hp motor, etc. If it was me I'd go at least 7hp.
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