110v 3 phase for baruffaldi turret

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Originally Posted by m_c

I'd guess most VFDs will simply rely on the electronics to provide a lower voltage output, but regardless unless the motor is inverter rated (higher voltage insulation), then even a VFD running at rated voltage can cause insulation breakdown due to switching harmonics. You'd typically prevent that problem by adding a sine wave/sinusoidal filter after the VFD, however I'm not sure if you can get them designed for 110V.

Would I be right in guessing this lathe originally ran of normal 3 phase, and already has a step-down transformer for the turret?
In which case, I'd look at using a boost VFD (230in 380out), and adding a sinewave filter if you're concerned about insulation issues (although the transformer will be the part likely to fail, as they are very unlikely to be inverter rated).

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you are correct, it originally had a fanuc 3t of 1985 vintage. the previous owner harvested it for spare motors and drives for another machine. so there isnt much left in the cabinet. i could give him a message and see if he knows although he may not have even considered it when pulling it apart. i might email baruffaldi again and try to get the full specs of the motor. maybe see what they recommend.

Do you have 3 phase power.? I think I've got a few transformers that I've stripped out of machines, most of them usually have a 110 winding.

I don't know this turret but how big a job would it be to replace the motor, or possibly fit a Servo.? You can get large servo's cheap enough.

i don't have 3 phase, it would be simpler if i did. the motor is a small integrated motor similar in diameter to a round body nema 34.

could convert it to servo or stepper operation. would be handy enough to machine an adaptor plate. would need to figure out the brake situation though.

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Originally Posted by jonnydeen

could convert it to servo or stepper operation. would be handy enough to machine an adaptor plate. would need to figure out the brake situation though.

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How does it brake now.? It's easy enough to get servos and steppers with a brake but I'm not sure they would hold a large turret good enough.?

there is a 24vdc brake on the motor
i think i will just get a site 110v transformer and a 110v to 110v vfd, and brake resistor. unless baruffaldi enlighten me with a better option

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Originally Posted by jonnydeen

there is a 24vdc brake on the motor
i think i will just get a site 110v transformer and a 110v to 110v vfd, and brake resistor. unless baruffaldi enlighten me with a better option

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You will get a Stepper or Servo with Brake cheaper than a site transformer and VFD.

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Originally Posted by JAZZCNC

You will get a Stepper or Servo with Brake cheaper than a site transformer and VFD.

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thats a very valid point, and it might just be the way i go. if i cant find a better option soon.