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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > Pimp my lathe. Converting a HF 44142 3in1 to 3 phase
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  1. #1
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    Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Decide to upgrade my 3 in 1 again. This time converting from single phase 3/4hp single speed to 3 phase 1hp variable speed via a VFD.

    Video of the test run of my dumpster motor + VFD:
    https://youtu.be/kS9FsNZOQi8

    My upgrade BOM:
    https://docs.google.com/spreadsheets...it?usp=sharing

    and some early photos attached.

  2. #2
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Check out these Leeson Motors.

    Leesondirect.com

  3. #3
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Seems overpriced. Automation direct has similar motors for ~$50 less. More than likely will just try and find another used motor and rebuild it myself again. Save quite a bit that way and my hobby milling will never tax it too hard.

  4. #4
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Feeling motivated tonight here is another video.
    https://youtu.be/fEy6GD6PAZ0

    Got all the remote IO wired up to test switches and ran the controller though it's paces. Also set up the acceleration select input so I can have different ramp down speeds depending if the motor was turned off via the normal control (fwd/off/rev switch) or by one of the EPO switches.

  5. #5
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    My understanding is that voltage controls rpm and current controls torque.
    A lazy man does it twice.

  6. #6
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    No. VFD means "variable frequency drive". Frequency controls speed.

    VDFs are Awsome, and 3-phase motors can be had on eBay for cheap - even new ones. I've converted my lathe, mill, and even my 4x6 bandsaw. VFDing a cheap bandsaw was a bit silly but I had the parts already, and now the motor stays cool on long cuts, and I can crank up the speed for aluminum.


    Sent from my iPhone using Tapatalk

  7. #7
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    I understand what a VFD does to some degree. I also have 1 on my lathe. I am responding to his current going down as his rpms increased.
    A lazy man does it twice.

  8. #8
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Quote Originally Posted by Fastest1 View Post
    I understand what a VFD does to some degree. I also have 1 on my lathe. I am responding to his current going down as his rpms increased.
    The voltage/frequency curve is flat from 60 to 120Hz in my current setup. Would think for a given speed increase the work needed to spin the motor would go up with speed. (bearing / air drag) If that is correct since my voltage is fixed the current should go up (I*V = P). One thing that it could be is at the increased speed the fans are cavitating and moving less air therefor dropping the total load on the motor....

  9. #9
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Part 3 playing with inductive proximity sensors as a pickup for the spindle RPM meter.
    https://youtu.be/RHz4de7N4dY

  10. #10
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Some minor progress today got most of the wire strung in the house and the service disconnect output all buttoned up. Just 1 more hole, 1 board, 3 wire staples, and 7 screws till I am done

  11. #11
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Another update video here:
    https://www.youtube.com/watch?v=jRLHzYihbGM

    Got another junk motor (out of a snowbank no less) and rebuilt it with acceptable results. Has a slight whine at high speeds I am not crazy about but for $20 worth the risk.

  12. #12
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Semi final wiring diagram done and attached. Just placed the order for the parts I was missing. New Lathe motor mount and motor installed now.
    Attached Thumbnails Attached Thumbnails 3phase_HF_upgrade.pdf  

  13. #13
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Some minor updates to the wiring diagram had to run one main contractor off a switch on the other. If I tried to close both at the same time my transformer would brown out and they would chatter and not close. By running the second off the switch on the first it introduces just enough delay to prevent the chattering and they close first time every time.

  14. #14
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    Re: Pimp my lathe. Converting a HF 44142 3in1 to 3 phase

    Part 5:
    https://youtu.be/H5DQSUnfKGg

    project is not only still alive it has been done for a while. Just finally getting around to editing the video.
    More to come.

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