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Thread: Shaft repair

  1. #1
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    Default Shaft repair

    How would you go about repairing this? It's the selector shaft from my lathe's gearbox. My thought was build up with bronze alloy and turn back. But I don't have oxy gear any more. Would an epoxy like JB Weld be a stupid idea?

  2. #2
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    Are you repairing it for appearance or does the effected area have a detrimental effect on the feeding of the lathe.

    Is this the Feed shaft that runs through your carriage?

    Where along the Shaft is the damage,front,rear or centre.

    If it is catching on some part of the Feed you could try the Epoxy type fillers,not sure how well they would work in this situation.

    Would be cautious about getting too much heat into it if you were to braze it as you might distort the shaft and find it binds up a bit.

    If its not catching on the Feed mechanism you maybe able to just dress it up with a file or rotary bur to get rid of any sharp edges.

  3. #3
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    Another possible option might be to use a metalised epoxy putty. From what I understand they are quite wear resistant and temperature stable.
    Cheers.

    Vernon.
    __________________________________________________
    Bite off more than you can chew and then chew like crazy.

  4. #4
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    With motor and gear box shafts, we have heavily chrome plated the shafts and then ground them down to size.
    Two things are infinite: the universe and human stupidity; and I´m not so sure about the universe.


  5. #5
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    Pipeclay, as I said it's the selector shaft from the gearbox. The selector levers slide along it, and two gears turn on it also. Yes it is catching in both cases so something has to be done. I did spin it in the chuck and give it a rub with a file wrapped in emery paper. What stopped me was the fear I would make it eccentric. I could feel it riding over the lumpy bit and falling into the keyway and it just felt all wrong. I think I'll put it in the vise and target the work more. If I get the high spots off and it still catches I'll look into the fillers more. Anyone got any specific recommendations for epoxy products? Plating would be a last resort I guess. Nice to know it's do-able though. Thanks guys.

  6. #6
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    Bryan
    I'd be carefully filing the high spots off with a fine file and then see how it worked. Looking at your pic it appears to have a couple on the edges of the galled bits.Getting them off might be all it needs. The galled marks don't look that bad in the pic. (compared to some I've seen on other stuff)

    regards
    bollie7

  7. #7
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    I would nix the epoxy idea.Bollie has the right idea with just a clean up with a file.

    There is a correct way to file the ragged and high spots with the file.

    Rather than just following the contour around the shaft with the file, it is started point down,handle up and pushed through and finishes with point up, handle down .The technique helps avoids flats on the shaft.It is basically a rolling action.

    Read the diagrams from left to right
    Last edited by Grahame Collins; 4th Jun 2010 at 07:05 AM. Reason: to explain the process a little more clearly

  8. #8
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    Hi Bryan, just curious, what's the shaft diameter & length, & the width & depth of the key-way? Also are there anything special about the ends that are not in the pic?
    Regards, Ian

  9. #9
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    Quote Originally Posted by tinkera View Post
    Hi Bryan, just curious, what's the shaft diameter & length, & the width & depth of the key-way? Also are there anything special about the ends that are not in the pic?
    Regards, Ian
    Tinkera, it's 16 x 230. Sorry, I forgot to measure the keyway. Actually one end is a bit 'special'. It looks like it's been welded up. I guess the keyway would have extended right through, like the other end.

    Anyway, I filed it as suggested and it seems to have solved the problem. (Thanks for the input.) The box is now assembled and should work, with the exception of all 'E' ratios because of one damaged gear.

    Now I'm trying to get my head around the missing change gears. My machine seems to differ from its known siblings in this respect.

  10. #10
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    May sound dumb but why not just make a new one ?????

    The other option is to fill it up with a tig weld and machine or grind back to its origional
    finnish.
    But I would still lean towards just making a new shaft, If you don't have the tooling or the know how
    I'm sure one of the fellers on the site here could help you..If you were close I could have a go for you.
    Matt
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