HP to watts

by Russ Kepler

1 HP is 750 watts (give or take) so a motor using 3.2A at 120V isn't generating even a single HP, more like .5HP at 100% efficiency (and that's not happening).

120V at 15A is 2.4 HP, so that's the max load you can handle. Since there are VFDs that take 120 in and spit 240 3 phase out that's also an option (albeit a little pricey), so something like a nice Clausing, Rockwell or smaller Bridgeport are options, even a used Enco RF30 . Keep looking around, I picked up a nice Hardinge horizontal with a vertical head (and full set of tooling) for something like $750 a year or so back and there's not a lot of stuff you couldn't do with that rig.

Looking at it the G3102 likely wouldn't trip your breaker. If it were 3 phase and you used a VFD you could be sure, the slow start on a VFD is a lot easier on breakers than the surge from a direct connection.

But in summary I'd suggest getting as much mill as you can - you may not always need all of the travel but not having it when needed can hurt.

Posted on Aug 1, 2011, 5:34 AM

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  1. You can't run 2.4HP on a 15A breaker.... sniper1rfa, Aug 1, 2011
    1. 2.4 Hp on 15A 120V breaker. Uticus, Aug 1, 2011
      1. eh.... sniper1rfa, Aug 1, 2011
        1. probably right. Uticus, Aug 1, 2011
    2. E=I*R. Russ Kepler, Aug 2, 2011


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