Hi All,
This is going to be one hell of a long-winded and confusing post, but I could really use any help or advice with my current dilemma: how to power a Schaublin 102 bench mounted toolroom lathe using 110V single phase power. Here is the background: I live in a rental, pre-war apartment in NYC which only has access to 110V, 60Hz single phase power, from a standard residential breaker box with 20A circuit breakers (and what I am assuming is 12 gauge wire in the walls). I am looking at purchasing either a Habegger or Schaublin 102; the seller has a couple bench mounted models available but all have 220V, 60Hz, two speed motors, all around 1.5HP. Rotary phase converters, and installing 220V power are out of the question, along with upgrading the wiring in my walls. So far, I have looked into using a 1.5HP 110V 1-p input to 220V 3-p output VFD, like this: Weg - CFW300A06P0S1NB20, Invertek - ODE-3-210058-104B. I have also considered using a step-up transformer and a 220V 1-p to 220V 3-p VFD. Another option is to replace the motor entirely. The motors that the seller has are all old, noisy original Swiss units, and I wouldn't mind changing them out (buying the lathe without the motor) for a brand new 220V three phase 1.5HP unit. However, it seems that whether I get an original 1.5HP motor, or get a new 1.5HP motor, I would still be running into the current limitations of my circuit breaker and wiring. A rep from Dealers Electric gave me the following math, with the assumption that a 1.5HP 3 phase motor draws around 6 amps.
He basically suggested that I would be limited to a 1HP motor and 1HP VFD, which I am not even sure would be suitable for the 102, since I would get even less power with the motor running at lower speeds. I don't intend to be making any huge cuts into steel with the lathe, but I am hesitant to downgrade the motor by 33% from its original spec. I am relatively new to machining, and I am no means an electrical whiz either, so any advice would be greatly appreciated. I suppose my questions/concerns boil down to the following:
1. Can I drive a 1.5HP, 220V 3 phase motor with a 1.5HP, 110V input VFD in the first place, whether it is an original swiss motor, or a modern one, using 20 amp rated circuit breakers and wire.
2. If I can do (1), should I get a new motor (probably quieter), or stick to the original, for some reason.
3. If I can't do (1), how "bad" of an idea would it be to power the 102 with 1HP 3 phase engine, and 1HP VFD.
4. Is there something easier/obvious/better that I am missing? Perhaps 110V or 220V single phase engines, or 110V 3 phase engines, or DC motors, etc etc.
Thanks to all in advance, and I hope this post made sense. And obviously I know I am dumb for living in NYC with no access to 220V power, which the rest of America (and the rest of NYC, probably) has.
This is going to be one hell of a long-winded and confusing post, but I could really use any help or advice with my current dilemma: how to power a Schaublin 102 bench mounted toolroom lathe using 110V single phase power. Here is the background: I live in a rental, pre-war apartment in NYC which only has access to 110V, 60Hz single phase power, from a standard residential breaker box with 20A circuit breakers (and what I am assuming is 12 gauge wire in the walls). I am looking at purchasing either a Habegger or Schaublin 102; the seller has a couple bench mounted models available but all have 220V, 60Hz, two speed motors, all around 1.5HP. Rotary phase converters, and installing 220V power are out of the question, along with upgrading the wiring in my walls. So far, I have looked into using a 1.5HP 110V 1-p input to 220V 3-p output VFD, like this: Weg - CFW300A06P0S1NB20, Invertek - ODE-3-210058-104B. I have also considered using a step-up transformer and a 220V 1-p to 220V 3-p VFD. Another option is to replace the motor entirely. The motors that the seller has are all old, noisy original Swiss units, and I wouldn't mind changing them out (buying the lathe without the motor) for a brand new 220V three phase 1.5HP unit. However, it seems that whether I get an original 1.5HP motor, or get a new 1.5HP motor, I would still be running into the current limitations of my circuit breaker and wiring. A rep from Dealers Electric gave me the following math, with the assumption that a 1.5HP 3 phase motor draws around 6 amps.
"3 phase Current @ 230V * 2 = 3 phase current @ 115V
3 phase current @ 115V * SQRT 3 = 1 phase current @ 115V
6 A * 2 * 1.73 = 20.76A Plus the conversion is not 100% efficient so the maximum amperage could be higher."
3 phase current @ 115V * SQRT 3 = 1 phase current @ 115V
6 A * 2 * 1.73 = 20.76A Plus the conversion is not 100% efficient so the maximum amperage could be higher."
He basically suggested that I would be limited to a 1HP motor and 1HP VFD, which I am not even sure would be suitable for the 102, since I would get even less power with the motor running at lower speeds. I don't intend to be making any huge cuts into steel with the lathe, but I am hesitant to downgrade the motor by 33% from its original spec. I am relatively new to machining, and I am no means an electrical whiz either, so any advice would be greatly appreciated. I suppose my questions/concerns boil down to the following:
1. Can I drive a 1.5HP, 220V 3 phase motor with a 1.5HP, 110V input VFD in the first place, whether it is an original swiss motor, or a modern one, using 20 amp rated circuit breakers and wire.
2. If I can do (1), should I get a new motor (probably quieter), or stick to the original, for some reason.
3. If I can't do (1), how "bad" of an idea would it be to power the 102 with 1HP 3 phase engine, and 1HP VFD.
4. Is there something easier/obvious/better that I am missing? Perhaps 110V or 220V single phase engines, or 110V 3 phase engines, or DC motors, etc etc.
Thanks to all in advance, and I hope this post made sense. And obviously I know I am dumb for living in NYC with no access to 220V power, which the rest of America (and the rest of NYC, probably) has.
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