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  • Stuck Back Gears

    I recently purchased a 1929-1930 16" South Bend lathe and the back gears are frozen. I tried pb blaster with no results. The back gears do not have the single large oil hole, it has the two small push in ball oilers. Any ideas on how to fix this problem?

  • #2
    Is it a rust bucket?

    Chris

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    • #3
      buy a gallon of diesel or kero. take off the back gear assembly and soak them for a few days if you can, occasionally tapping the gears to check the progress. Otherwise, heat and regular penetrating oil and the same gentle tapping routine.
      gvasale

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      • #4
        Here's a WAG:
        I don't know if that lathe has the same setup on the back gears as my 10K, but if it is there should be some kind of friction adjustment screw to hold the gears in mesh. That might be too tight. Or is the problem that they won't turn?
        ----------
        Try to make a living, not a killing. -- Utah Phillips
        Don't believe everything you know. -- Bumper sticker
        Everybody is ignorant, only on different subjects. -- Will Rogers
        There are lots of people who mistake their imagination for their memory. - Josh Billings
        Law of Logical Argument - Anything is possible if you don't know what you are talking about.
        Don't own anything you have to feed or paint. - Hood River Blackie

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        • #5
          Is it possible the bull gear and the back gears are both engaged? Of course this is Atlas speak, not 16" speak...

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          • #6
            Explain a bit further please. Do you mean that the back gears will not turn on the shaft they run on even though disengaged from the spindle?
            Free software for calculating bolt circles and similar: Click Here

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            • #7
              The lathe is in very good condition. The previous owner had it painted and he never used it for turning work. It had a special fixture that he used with a boring head to bore go kart engine blocks.
              The back gears will engage/disengage but they will not rotate.

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              • #8
                don't get them to turn ..just disassemble them . and clean

                some small parts are there..watch for them

                all the best.markj

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                • #9
                  Will the back gears, as a unit, turn on their shaft when not engaged with the bull gear?
                  Jim H.

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                  • #10
                    You aren't forgetting to unpin the spindle when you engage the back gears, are you? I only ask because I see you are a new member and I'm thinking you might not be experienced in using lathes.

                    BTW, welcome to HSM.
                    Location: Saskatoon, Saskatchewan, Canada

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                    • #11
                      Originally posted by Arcane
                      You aren't forgetting to unpin the spindle when you engage the back gears, are you? I only ask because I see you are a new member and I'm thinking you might not be experienced in using lathes.

                      BTW, welcome to HSM.
                      Now this is a really good example of deductive reasoning!

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                      • #12
                        Guys, he said in post #7 that they will not rotate WHEN DISENGAGED.

                        Originally posted by Chris165
                        The lathe is in very good condition. The previous owner had it painted and he never used it for turning work. It had a special fixture that he used with a boring head to bore go kart engine blocks.
                        The back gears will engage/disengage but they will not rotate.
                        They obviously have frozen on their own bearings, probably dried grease (or oil) since he says there are grease (or oil) fittings. It needs to be soaked with penetrating oil/solvent/WD-40/or some other solvent for some time to penetrate this dried grease/oil. Try to force some of the solvent into the grease fittings.

                        One caution, DO NOT try to force it loose while engaged with one of the other gears to hold it or to apply force. One of the biggest problems with lathes listed for sale is busted back gear teeth. You CAN break them. EASAILY!!!

                        After freeing them, disassemble and clean throughly. Check the SB manual for this model and use the appropriate grease or oil, DAILY. Actually, do that for the whole machine.
                        Paul A.
                        SE Texas

                        Make it fit.
                        You can't win and there IS a penalty for trying!

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                        • #13
                          Originally posted by Arcane
                          You aren't forgetting to unpin the spindle when you engage the back gears, are you? I only ask because I see you are a new member and I'm thinking you might not be experienced in using lathes.

                          BTW, welcome to HSM.
                          Thanks for the welcome.
                          My experience is with cnc equipment. I used to run a Mazak QT10, SQT100MSY 5 axis lathe with live tooling and a Hass VF4. I also used a large Nardini and a small Clausing. I do small machine work in my personal shop and purchased the south bend because my two sherline lathes will not handle all the things I want to build.



                          As far as the south bend this is my first time owning a piece of old American machinery.
                          The pin on the bull gear is disengaged and the back gears will move in and out. However they will not rotate on the shaft.

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                          • #14
                            The pulleys are stuck to the spindle.
                            Gene

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                            • #15
                              If you can take a sharp chisel and take out the push type oil fitings and try to get some pb blaster or some such in , maby a little air to force some in along with some light taping with a hammer and keep trying to work the gears back and forth they will come loose at some point just have to work at it. Good luck
                              Richard

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