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How to repair gib adjuster slot?

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  • How to repair gib adjuster slot?

    I'm looking for advice on how to repair this gib. It's quite small - for scale the thread of the adjuster is M4, OD of the large diameter is 8mm.

    How can I repair the slot so I can make the adjuster serviceable? I have access to a pretty damn good welding guy with a tidy TIG. I'm thnking grind or file off the high spots, build the edges with tig or braze then file the slot back to width. Would this be an acceptable repair?

    Peter - novice home machinist, modern motorcycle enthusiast.

    Denford Viceroy 280 Synchro (11 x 24)
    Herbert 0V adapted to R8 by 'Sir John'.
    Monarch 10EE 1942

  • #2
    Not trying to be flip but hit it with a hammer. The secret is to use a light weight hammer and a little patience. Gunsmiths know the can peen buggered up screw heads by lightly bending the metal back in and then re cutting the screw head with a warding file. You should be able to clean it up enough that it will be serviceable for a long time.

    Welding over the bad part and re cutting the notch would be another answer but move involved in my estimation.

    Good luck.
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    • #3
      What about opening up the slot to remove the damage, then either make a new screw with a wider collar, or get your mate to build it up with weld on the unthreaded side and machine it back to size.
      Welding on that side of the adjuster wouldn't hurt anything.

      Dave

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      • #4
        You have a situation where the collar is not going into the slot deep enough. You can have it welded up but it will just happen again unless you can figure out a way to get the collar full depth into the slot. Perhaps you may have to make a screw with a larger collar and open the recess it fits into.

        If you just weld it up and put it back it will fail again. You need to find out why it failed and correct it.
        It's only ink and paper

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        • #5
          Can you reverse the piece (flip end for end) and cut a new slot in the other end?

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          • #6
            Gibs like his are tapered and only fit in one direction. Some gibs are the same size the length of them and use snubing screws along the length of the gib to adjust it. Those usually have a pin that keeps them located.
            Last edited by Carld; 09-08-2011, 10:35 AM.
            It's only ink and paper

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            • #7
              Gibs are made of cast iron ..although that ones looks too ductile to be it.

              i would only risk braise on them if they are

              all the best.markj
              Last edited by aboard_epsilon; 09-08-2011, 11:29 AM.

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              • #8
                Looks pretty small but how about milling off the damaged area flush to the grove and drilling and tapping a 2-56 socket head cap screw so the head is tangent to the old groove.

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                • #9
                  Originally posted by Carld
                  You have a situation where the collar is not going into the slot deep enough. You can have it welded up but it will just happen again unless you can figure out a way to get the collar full depth into the slot. Perhaps you may have to make a screw with a larger collar and open the recess it fits into.

                  If you just weld it up and put it back it will fail again. You need to find out why it failed and correct it.
                  Funny you should say that Carl - I just noticed something odd. It looks to me like the adjuster groove has been machined in the wrong side. Reason I think this is because the frosting is all intact on the side that has the oiling groove but is worn away on the side that just has the plain through-hole showing. Now surely the oiling groove should be on the face that slides?





                  Both were packed with dried out gunge so I guess that could account for the gib sticking and the wear in the slot.
                  Peter - novice home machinist, modern motorcycle enthusiast.

                  Denford Viceroy 280 Synchro (11 x 24)
                  Herbert 0V adapted to R8 by 'Sir John'.
                  Monarch 10EE 1942

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                  • #10
                    Yes, I think your right, the oil groove should be on the rubbing side. I have run into the problem of the collar not being large enough to fully engage the slot on even quality lathes and had to make changes to make it right.
                    It's only ink and paper

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                    • #11
                      Well then, since the gib measures a taper in only one plane and seems to be a parallelorgram in cross-section I guess the cure for both problems is to re-cut the adjuster groove on the opposite side.

                      Now, if only I had a working miniature precision horizontal milling machine to do it with
                      Peter - novice home machinist, modern motorcycle enthusiast.

                      Denford Viceroy 280 Synchro (11 x 24)
                      Herbert 0V adapted to R8 by 'Sir John'.
                      Monarch 10EE 1942

                      Comment


                      • #12
                        Is it one of those "Childs" milling machines you have there .

                        lets see a picture of the whole thing please .

                        all the best.markj

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                        • #13
                          Originally posted by Peter.
                          Well then, since the gib measures a taper in only one plane and seems to be a parallelorgram in cross-section I guess the cure for both problems is to re-cut the adjuster groove on the opposite side.

                          Now, if only I had a working miniature precision horizontal milling machine to do it with
                          You probably do have one. It's called a file. Could probably have it done before you could get it set up in a mill. Dremel type tool should do it too.
                          Don Young

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                          • #14
                            Yes I have files of course

                            Mark, its a Rawyler mill. I did take some pictures before dismantling it but my digital camera has had a benny and saved all the photos with lines across them like a bad tv picture. Looked ok on the viewfinder but no good on the sd card.
                            Peter - novice home machinist, modern motorcycle enthusiast.

                            Denford Viceroy 280 Synchro (11 x 24)
                            Herbert 0V adapted to R8 by 'Sir John'.
                            Monarch 10EE 1942

                            Comment


                            • #15
                              So its this then

                              http://www.lathes.co.uk/rawyler/

                              ..looks a lovely little thing ..nice .

                              all the best.markj

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