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  1. #1
    Ive just bought a Boxford 250F that is running 3ph Fanuc OT system. I had planned to runn it off a converter but I understand that the OT system is quite old and cant handle large programmes.

    I could reto fit with steppers but it seems crazy to loss the fanuc servos for steppers.

    If I convert to 240v single phase I would like to retain the motors and run from linux cnc with mesa cards.

    Ive seen The pico system and granite devices do a compatable drives but the pico is standalone and the GD is pricey.

    Are there any other drives available or anyone done a similar project?

  2. If the existing servo drives work (technically they're Servo Amplifiers, and a search should turn up more options) , keep them. You'll just need to figure out what they are, and what signals they need to run (they'll be +/-10V analogue drives, but you'll need to find enable/fault signals).

    Other option is you convert to something like the CNC Drive DC servo drives, which will accept a step/dir signal, removing the need for an analogue controller.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #3
    Unfortunally the lathe is at a freinds workshop at the moment so I cant check model numbers ect. I just assumed that the Fanuc drives cant be used as I couldnt find any examlples of people doing it. Also they are 3 phase so I would still need a rotary converter.

    in the documents it looks like the spindle VFD has already been changed for a Mitubishi 240v one, if so that takes care of the spindle so its only the servo drives that need to be changed to get it all on 240v.

    Can I use DC servo drives on an AC motor?

  4. Are you sure they're AC servos?

    From what I'm aware, most machines of that era used DC servos. The 3 phase will go through a transformer, before being rectified to provide DC for the amps.

    You really need to get model numbers of everything.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  5. #5
    Yes they are definatly red top AC servos and feed 3phase 415v Click image for larger version. 

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    I will try and get the numbers tommorow, cheers

  6. Oh.
    Selling them and buying some new servos and drives is likely to be the far easier option, if you do want to change the control.

    Lack of program memory on a lathe isn't that big a problem, as most lathe programmes aren't that big anyway.
    But it all depends on where you want to spend time and money, between running the existing system, or fitting a new system.

    I'd be seeing how much a working Fanuc system is worth, and making a decision from there.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

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