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  1. #1
    *Registered User*
    Join Date
    Apr 2018
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    4

    G0704 Spindle Upgrade

    Hey guys i am new to the forum. I am building a cnc g0704. It will have the bearing upgrade, belt conversion, and power drawbar. I am wondering if the motor posted below would be a good choice with 36-60 pulleys so it will have a top spindle speed of 5k rpm. I am wanting a servo motor so I can do power tapping. Any experience you guys may have with servo motors for the spindle would be greatly appreciated.

    https://www.fasttobuy.com/18kw-220v-high-speed-servo-motor-3000rpm-nema-42-6nm-ac-servo-motor-drive-kits-for-cnc-router_p35894.html?gclid=Cj0KCQjw2pXXBRD5ARIsAIYoE beMigPoLGrPJSSKKijvYnqqllikFJ5bbGgVokO7YtlldQmdFrv ZynQaAqYMEALw_wcB

  2. #2

    Re: G0704 Spindle Upgrade

    That doesn't look like a terrible package. You are going to hurt your torque pretty badly with that overdrive and that will certainly change your feeds and speeds.

    Personally I'd go with a BLDC and driver that's capable fo 6k from the factory. 2.2kw is a good range, just make sure it works on 220v, lots of them are 320v especially from Asian vendors.

  3. #3
    *Registered User*
    Join Date
    Apr 2018
    Posts
    4

    Re: G0704 Spindle Upgrade

    I ended up going a different route and bought a kollmorgen akm42 servo motor. It has about 2hp, 6k rpm, and roughly twice the torque of the other motor. I got a great deal on ebay for a brand new one.

  4. #4

    Re: G0704 Spindle Upgrade

    Cool! What kind of hardware and software you using to control it?

  5. #5
    *Registered User*
    Join Date
    Apr 2018
    Posts
    4

    Re: G0704 Spindle Upgrade

    Kollmorgen driver of some sort off of ebay to a normal breakout borad. Using mach3 or 4. havent decided on which one yet. x,y,z axis' will be run with clearpath servo motors.

  6. #6
    Member
    Join Date
    Sep 2020
    Posts
    1

    Re: G0704 Spindle Upgrade

    I know this is a old thread but did you ever get the servo installed and were you getting 6000rpm? Also can I get the driver model number?

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