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  • Strange lathe question.

    My lathe is in storage with no power, needs 3ph.
    Might be able to get 110 v single.
    Because my lathe has a very nice gearbox it is very nice for threading, many threads without changing gears, Std and Metric.

    My buddies main lathe cuts only std. He picked up a 14 inch swing metric lathe, I think it cuts a lot of threads, but quite often you are changing gears.

    The tought entered my mind, that if I could power my lathe, with 1 or 2hp, perhaps I could make parts on another lathe, but do the metric threading on mine.. it could be a big help.the la the is 7.5 hp.looks like Kingston or Mazak.

    Maybe not a good idea, but it's there, rather make use of it.

  • #2
    You CAN get uo to 1 HP, 1.5 HP if the 120V is strong, because several sources sell voltage doubling VFDs that output 230V 3ph from 120V. I think TECO, Hitachi, and Invertek all have them.
    1601

    Keep eye on ball.
    Hashim Khan

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    • #3
      If you can mount a motor that is compatible in mounting needs, certainly it would run strong enough for threading, and actually quite a lot more than that. Unless you use a VFD and 3 phase motor or a DC motor and controller, you would have only one RPM per belt position, but that may have been the case originally.

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      • #4
        My 18x60 Mazak clone came with 10 hp 3 ph ,I changed over to 5hp 1 ph that I had on hand never a problem.

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        • #5
          I was thinking to mount it to outer end of spindle to left of tailstock.

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          • #6
            Originally posted by 754 View Post
            I was thinking to mount it to outer end of spindle to left of tailstock.
            If similar to mine you could remove cover where existing motor is and belt drive straight up to driven pulley.There should be room to mount a smaller temporary motor with separate switch.

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            • #7
              A one HP motor would limit the diameter and/or the depth of cut but many lathes are/were powered with much less than that.

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              • #8
                Could be done, but I would not mess with the current drive system.
                Put the lathe in neutral to isolate the current drive.
                Then mount an expanding mandrel in the left side (outboard) of the spindle and have a pulley mounted on it.
                Mount your temporary motor out there and drive it with a V belt .
                Your lead screw drive comes off the spindle so it should be no problem there for threading.
                You may need a double reduction for speed, but don't know the size of your threads. ?

                Rich

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                • #9
                  Good point the reduction, i like to thread around 150 to 240 rpm.
                  Two points, the lathe is easy to setup, easy to use and I am very used to it.
                  I can remember cutting threads, say a 5/18 , in 8 minutes. That is mounting tools selecting gearbox settings, and multiple passes.

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                  • #10
                    What makes your lathe strange?
                    "Let me recommend the best medicine in the
                    world: a long journey, at a mild season, through a pleasant
                    country, in easy stages."
                    ~ James Madison

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                    • #11
                      Is your Lathe similar to this setup,for temporary use you could unbolt cover and attach a 1-1/2 HP Motor on it at the rear of lathe,pulley sitting right there.

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                      • #12
                        Originally posted by flylo View Post
                        What makes your lathe strange?
                        I think he meant the question was strange, not the lathe itself. (using alternative power)

                        Rich

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                        • #13
                          Threading on a lathe would not require anything like as much horsepower as turning. And the gearing would be lower.

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                          • #14
                            Exactly.. as I read the thread about buying a mid size lathe, I hear what they are saying.
                            I may have access to a Mathews type lathe, but I realize there is Still a lot of changing and setup required on a lot ofvthe pitches.
                            That is not a problem on my lathe should I find a reasonable solution to powering it.

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                            • #15
                              Originally posted by 754 View Post
                              That is not a problem on my lathe should I find a reasonable solution to powering it.
                              What's not reasonable about using an RPC or VFD to power it?

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