Help with 120 conversion please


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Thread: Help with 120 conversion please

  1. #1
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    Default Help with 120 conversion please

    Hello, I Am currently converting an emco 120 lathe.
    It has a Chinese cnc controller, simalar to fanuc system.

    I need to buy a stepper/driver combination for the lathe but I need some help choosing the best route.

    The axis force from the brochure states 10n force.
    Then ball screws are 5mm pitch, and the motor ball screw has a 2:1 ratio where the motor turns twice for every rev of the ball screw.
    The machine max rapid speed was 2000mm/min
    So I guess if I've calculated correctly, the motor would turn at 800 rpm at max rapid. I have no clue what the motor torque should be?

    So my question is should I buy nema 34 4.5nm closed loop stepper/driver?
    Or should I buy nema 34 8.7nm open loop steppers with dsp drivers?
    Or should I buy 4.5nm open loop steppers/dsp drives, and close the loop to my controller using an encoder?
    Or just simple and cheap 4.5nm open loop system?

    These options are all I can physically fit in the space available.
    Ideally I'd like to increase the rapids a little without compromising performance or reliability.

    Many thanks
    Lee

    Similar Threads:
    Last edited by monkyspunky; 06-07-2017 at 06:27 AM.


  2. #2
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    Default Re: Help with 120 conversion please

    Hey MonkySpunky,

    I don't have an exact answer for you but was curious. You stated that it's using a non Emco controller, how did you get the tool changer to work?

    I have a PC Turn 105 that I'd love to convert over to Tormach PathPilot control but the ATC is a huge issue.

    Thoughts...

    Awall - The Body Armor Dude
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Help with 120 conversion please

Help with 120 conversion please