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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. #2
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,148. Received thanks 236 times, giving thanks to others 5 times.
    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. #4
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,148. Received thanks 236 times, giving thanks to others 5 times.
    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. #6
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,148. Received thanks 236 times, giving thanks to others 5 times.
    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.

  7. #7
    The mesa stuff is known to drive motors/servos well.
    Granite D. is actually cheap ..

    Getting any of the commercial/fanuc servos running well has been an adventure, in general, for others.

    It will be very cheap to try with a granite d. system, vs anything else ..
    and about 3x easier, imho.

    There are endless caveats, most are unlikely.
    So it might be it wont work .. but this is 5-10% probability.

    Using the granite d. stuff makes you 10x more likely to succeed - imho.

  8. #8
    Ross here is the link to the drives https://granitedevices.com/products/

    and a page that might be able to walk you through http://www.wiki.eusurplus.com/index.php?title=Main_Page

    as you know I am following this
    ..Clive
    The more you know, The better you know, How little you know

  9. #9
    So a big plus for Granite devices then

    Not sure I class 420 a drive as cheap though, Would the IONI series be powerfully enough? Modular so I could build up the system as I need it.

    Thanks Clive, hadnt found that wiki but looks promising, I could even use my current mesa cards as the GD's accept step direction signals as well as 0-10v

  10. #10
    Had a look today and the motors are Type 3-OS, A06B 0533-B001#7000 and dated 90 04 so guesing April 1990

    6 pole, 112v, 0.5Nm and 1 amp, google seems to indicate a 2000ppr incremental encoder.

    Are they worth saving or just replace with a all new drives.

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