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  1. #1
    Join Date
    Dec 2007
    Posts
    578

    SBL Magnaturn Retrofit

    So here is my next project. It is a South Bend Lathe. PC based Magnaturn from the early to mid 80s. And probably had not been cleaned since that time also. Dug out over 15 gallons of crud from bottom of machine.
    Machine ran from two floppy drives. When i got it from owner it was not working. Turned out to be one of the floppies was corrupted.Got it running....but what a pig on power. It has a 15HP 3 phase motor that ran a bunch of hydraulic cylinders and motors.
    The system was very impressive tho. As the movement of axis was done with hydraulic cylinders and had scales for closing the loop. I did position tests of .0005" with no problems. But, machine just took to many amps to run. Took about 50amps to get it started!
    Here is some pics of bringing it home and before it got a LONG over do bath.

    Troy
    Attached Thumbnails Attached Thumbnails Cleaned and in New Home.jpg  

  2. #2
    Join Date
    May 2006
    Posts
    4043

    Re: SBL Magnaturn Retrofit

    Hi Troy,

    Wow. I've heard that hydraulic servos can be very accurate. I believe it was employed on some early semiconductor manufacturing equipment.

    Looking forward to see what you do with it. What's the game plan?

    Regards
    TK
    http://dynomotion.com

  3. #3
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Hay Tom,
    To get it up and running with just a toolpost. And later will tackle the turret.
    Lathe will be ballscrew with 750W AC servos directly coupled. Spindle hydraulic motor is replaced with a 5 HP Marathon Black Max motor driven by a TECO-Westinghouse A510 VFD.
    And of course... Dynomotion boards. KFLOP/Kanalog/Konnect combo.
    Got some more pics coming...

  4. #4
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Here is some more pics of the hydraulic mess before removal.

  5. #5
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Out with the old.....

  6. #6
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Out with the old electronics... Its something to see how tech has changed the graphics card is about the size of a mini atx motherboard.

  7. #7
    Join Date
    May 2006
    Posts
    4043

    Re: SBL Magnaturn Retrofit

    So what are you keeping? The feet?
    TK
    http://dynomotion.com

  8. #8
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Those and maybe a fan.

  9. #9
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Had to replace the turcite on the saddle(Z axis). It was thin and peeling off. Glued on some new and milled it down with a fly cutter. Stuff machines so easy. Will be getting it hand scrapped also.
    Troy
    Attached Thumbnails Attached Thumbnails MillingNewTurcite.jpg  

  10. #10
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Now got ballscrews,servos and spindle motor mounted. This was a tight fit on X axis ballscrew as there was not much room at all for a 1" screw and nut. And got the way lube flow figured out. Now onto mounting some electrical components.
    Troy
    Attached Thumbnails Attached Thumbnails ZaxisScrew1.jpg  

  11. #11
    Join Date
    May 2012
    Posts
    537

    Re: SBL Magnaturn Retrofit

    nice job!

  12. #12
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Needed some more room for electrical stuff. So made a custom electrical box.
    Attached Thumbnails Attached Thumbnails EmptyHole.jpg   Box1.jpg   Box2.jpg   Box3.jpg  

    Box4.jpg  

  13. #13
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Got some electrical components mounted....

  14. #14
    Join Date
    May 2006
    Posts
    4043

    Re: SBL Magnaturn Retrofit

    Hi Troy,

    I see you kept the fan. Whats the plan for the door to the 3.5inch floppies to be used for?

    TK
    http://dynomotion.com

  15. #15
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Hay Tom,
    Boy.... wish my lathe was as clean as the one in your picture The door will eventually have USB ports.

  16. #16
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    .

  17. #17
    Join Date
    May 2012
    Posts
    537

    Re: SBL Magnaturn Retrofit

    Nice work on the electrical enclosure. I like your welding bench, how its enclosed and storage underneath. Do you have a fume extractor or something up top? I bet it would work really well like that.

  18. #18
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Quote Originally Posted by mmurray70 View Post
    Nice work on the electrical enclosure. I like your welding bench, how its enclosed and storage underneath. Do you have a fume extractor or something up top? I bet it would work really well like that.
    Thanks.
    No, but there is a big exhaust fan in wall beside it that does the job very well. Now that you mention it i could easily duct to it and use a smaller fan for welding and such :idea:

  19. #19
    Join Date
    Dec 2007
    Posts
    578

    Re: SBL Magnaturn Retrofit

    Here is a video of making the Zaxis Ballscrew nut for lathe. I used Fusion360 for the High Speed Toolpath code and using my Dynomotion retrofitted Hurco mill.
    https://youtu.be/ZXJjyTpbhB4

  20. #20
    Join Date
    Dec 2007
    Posts
    578
    Last but not least the Dynomotion boards are mounted.
    Attached Thumbnails Attached Thumbnails BoardsOnRail.jpg  

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