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  • #1

    South Bend Heavy 10 problem

    Greetings fellow machinists,

    I'm thinking back to my first post here about 15 years ago and it was a question about a South Bend Heavy 10 lathe and Lane answered it almost immediately and I fixed my problem. It was a mater of not staying in back gear and Lane told me to tighten up the set screw on the back that has a spring loaded plunger behind it. That fixed it in less than a minute.

    Fast forward about 15 years and I ran into a guy that has a heavy 10 but doesn't have any idea how to operate it so I told him that I'd assist him in getting it going and teach him the basics of running it. Today I got it running and cutting but there is a problem with the feed. It has the knob on the carriage like my South Bend's have had that you turn clockwise to engage the carriage feed. But this one doesn't stop feeding when you turn the knob counter clockwise. It doesn't feed at hard as if it was engaged but if you don't hold it back it will keep feeding as long as the motor is running and the leadscrew is turning. And the carriage shows it. It's the most beat up carriage that I've ever seen from being fed into the chuck. My guess is that people would stop the feed but it would keep feeding and hit the spinning chuck.

    So my question is, why isn't the carriage completely disengaging? Could it be just too much crud behind the apron? This lathe looked like it was last cleaned during the Kennedy administration. Zero oil anywhere on it. I thought before I start tearing the apron off I'd check in with the experts here.

    I'm planning on working on it again tomorrow so if anyone has the answer it would be most appreciated.

    Thanks,
    Brian
    OPEN EYES, OPEN EARS, OPEN MIND

    THINK HARDER

    BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

    MY NAME IS BRIAN AND I AM A TOOLOHOLIC
    Tags: None
  • #2
    Sticky oil etc on the clutch and/or actuator system. That's the most likely. Saw that on an other non heavy-10 SB not that long ago.
    CNC machines only go through the motions.

    Ideas expressed may be mine, or from anyone else in the universe.
    Not responsible for clerical errors. Or those made by lay people either.
    Number formats and units may be chosen at random depending on what day it is.
    I reserve the right to use a number system with any integer base without prior notice.
    Generalizations are understood to be "often" true, but not true in every case.
    • 👍 1

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    • #3
      Originally posted by J Tiers View Post
      Sticky oil etc on the clutch and/or actuator system. That's the most likely. Saw that on an other non heavy-10 SB not that long ago.
      Thanks Jerry. It sounds like I'll be tearing it apart tomorrow for some more cleaning. Probably a good idea anyway. I've seen pictures of them that were caked full of chips and this one is probably as bad as it gets.
      OPEN EYES, OPEN EARS, OPEN MIND

      THINK HARDER

      BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

      MY NAME IS BRIAN AND I AM A TOOLOHOLIC

      Comment

      • #4
        Is there a spring in the clutch that is installed wrong? You are releasing the knob, but the clutch is not releasing because the 2 parts are not seperating.

        Comment

        • #5
          Thorough cleaning and lubrication is in order. Sounds like the lathe has led a hard life, void of regular maintenance.

          Comment

          • #6
            Originally posted by bborr01 View Post

            .................................................. .... I've seen pictures of them that were caked full of chips and this one is probably as bad as it gets.
            The one we took apart had the feed pickoff area in the apron packed tightly with chips. Nothing had been done to it as far as cleaning, etc to my knowledge for 20 years. Probably more. (It belonged to a relative). It HAD been extensively used in that time.........
            CNC machines only go through the motions.

            Ideas expressed may be mine, or from anyone else in the universe.
            Not responsible for clerical errors. Or those made by lay people either.
            Number formats and units may be chosen at random depending on what day it is.
            I reserve the right to use a number system with any integer base without prior notice.
            Generalizations are understood to be "often" true, but not true in every case.

            Comment

            • #7
              Originally posted by J Tiers View Post

              The one we took apart had the feed pickoff area in the apron packed tightly with chips. Nothing had been done to it as far as cleaning, etc to my knowledge for 20 years. Probably more. (It belonged to a relative). It HAD been extensively used in that time.........
              Are there any surprises that I should be ready for like springs or bearings that will be falling out? I'm going to hit it again tomorrow.
              OPEN EYES, OPEN EARS, OPEN MIND

              THINK HARDER

              BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

              MY NAME IS BRIAN AND I AM A TOOLOHOLIC

              Comment

              • #8
                Originally posted by kf2qd View Post
                Is there a spring in the clutch that is installed wrong? You are releasing the knob, but the clutch is not releasing because the 2 parts are not seperating.
                That's possible. I'll take a look at it tomorrow and see if it looks like a spring is in the wrong place.
                OPEN EYES, OPEN EARS, OPEN MIND

                THINK HARDER

                BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

                MY NAME IS BRIAN AND I AM A TOOLOHOLIC

                Comment

                • #9
                  Originally posted by tom_d View Post
                  Thorough cleaning and lubrication is in order. Sounds like the lathe has led a hard life, void of regular maintenance.
                  It's kind of rough but it still works and the guy got a lot of tooling with it. Steady rest, dead and live centers, qctp, drill chucks, tool bits, threading dial. It's pretty amazing that such a basic lathe can still make things probably 50 or 60 years after it was first sold. I spent some time cleaning and adjusting today. The flat belt started slipping if I took more than a .015" cut on 1" steel. I tightened it up and it cuts fairly well now. The owner bought it at auction and is really interested in learning now to run it and I'm looking forward to teaching him the basics.
                  OPEN EYES, OPEN EARS, OPEN MIND

                  THINK HARDER

                  BETTER TO HAVE TOOLS YOU DON'T NEED THAN TO NEED TOOLS YOU DON'T HAVE

                  MY NAME IS BRIAN AND I AM A TOOLOHOLIC

                  Comment

                  • #10
                    Sometimes these clutches will form a burr on the disks that hinder the disengagement of the feed. You can hone the burrs off with almost any hard stone. If you don't already have it, get the renovation guide for the SB 10L and up lathes from IIion Industries (that's "eye", "ell", "eye", "oh", "en"). Even if you don't intend to tear any assembly down, it's a great reference for your lathe.

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