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  1. #1
    Join Date
    Jan 2007
    Posts
    4

    Lathe VFD conversion

    Hello,
    I want to convert a Prazi SD400 (8x14) lathe to variable speed, without a loss of torque at slower speeds. The current motor is 1/2 hp. What would be the best VFD/ 3ph motor combination to accomplish this task. Thank you for your replies.
    Greg M.

  2. #2
    Join Date
    Jan 2006
    Posts
    738
    Did you change the motor already? The stock SD400 has a 1/3 horse motor.
    Take a look here for a Hitachi drive.
    http://www.wolfautomation.com/Produc...roductID=17539
    When you look for a motor, make sure to specify that it will be running on a VFD. Not all motors do well on VFD's

    Steve

  3. #3
    Join Date
    Jan 2007
    Posts
    4
    Steve,
    Thanks for the reply. I was planning on getting a larger inverter duty motor (1HP) to maintain enough torque at slower speeds. Trying to figure out if a larger motor will fit on the machine properly. Maybe this is not necessary with a sensorless vector drive.

    Greg M.

  4. #4
    Join Date
    Dec 2006
    Posts
    118
    Wow i am glad i looked at this post...i had no idea i could get a vfd with a 120v input that produces 3 phase at three hoursepower!
    I don't give a damn if you don't like me, cause i don't like you cause you are not like me.

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