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  1. #46
    Join Date
    Jul 2016
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    Melbourne
    Age
    35
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    1,522

    Default

    One thing that has really caused trouble for me is when a keyed shaft has twisted at the exit of a gear bore, even a very slight twist can lead to total binding. I have had to cut through shafts a few times because of this with single ended hacksaws. Its pretty miserable.

  2. #47
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

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    20190716_204355.jpg20190716_204447.jpg
    In these 2 pics, it appears to me to be threaded in there, try unscrewing these before going any further with the knocking them out.
    Have seen where the shaft has shoulders on them to hold the gears in place, and the bush is screwed in place to hold everything in place, with a type of preload.
    HTH
    Kryn
    To grow old is mandatory, growing up is optional.

  3. #48
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Have you removed both gaskets?

  4. #49
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

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    Quote Originally Posted by caskwarrior View Post
    One thing that has really caused trouble for me is when a keyed shaft has twisted at the exit of a gear bore, even a very slight twist can lead to total binding. I have had to cut through shafts a few times because of this with single ended hacksaws. Its pretty miserable.

    I guess that is a distinct possibility.. I am going to try to fabricate a screw clamp type arrangement to press the shaft out.. I just have to hope that I push the right way as both ends of the shaft are different diameters and I'm not sure if there are any shoulders on the shaft. I really want to avoid having to cut the shaft..

  5. #50
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

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    Quote Originally Posted by KBs PensNmore View Post
    20190716_204355.jpg20190716_204447.jpg
    In these 2 pics, it appears to me to be threaded in there, try unscrewing these before going any further with the knocking them out.
    Have seen where the shaft has shoulders on them to hold the gears in place, and the bush is screwed in place to hold everything in place, with a type of preload.
    HTH
    Kryn
    Hi Kryn,

    The threads that you can see are for the cover plate. They are machined into the casting. The thinner of the two bushings comes out easily as it only retained with a set screw (which was missing). The worn bushing is similarly retained with a set screw.

  6. #51
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

    Default

    Quote Originally Posted by pipeclay View Post
    Have you removed both gaskets?
    Yes.. there's no hidden fasteners beneath them unfortunately.

  7. #52
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,436

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    Hi Flo,

    Have you removed these fasteners ?

    20190713_170406.jpg

    Circled in red.
    Best Regards:
    Baron J.

  8. #53
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

    Default

    Quote Originally Posted by BaronJ View Post
    Hi Flo,

    Have you removed these fasteners ?

    20190713_170406.jpg

    Circled in red.
    Yes I have. The one on the left is literally only in a couple of threads so it didn't get lost. The one on the right was missing when I opened the gearbox. Those 2 set screws only serve to locate the bushings for lubrication purposes. They don't appear to key into a groove on the shaft.

    My understanding is that there are 4 set screws which locate and lock the 2 spacers positioned between the #1 and #2 gear assemblies to limit gear end float. I have removed these set screws and the spacers are able to move slightly. I can't see any other grub screws that need to be removed..

    I'm assuming that the gears are keyed onto the shaft as I can see a key when I move the spacers.. perhaps this key is damaged slightly or twisted as caskwarrior has suggested..

    The journey of discovery continues...

    Sent from my SM-N960F using Tapatalk

  9. #54
    Join Date
    Sep 2016
    Location
    Vacy
    Age
    46
    Posts
    5

    Default

    Good morning i have one of these fine lathes as well and have gone through a headstock strip down. The intermediate shaft gears are keyed to the shaft using woodruff keys, they are a very close fit to the shaft. My method of removal was to apply heat to the gears and tapping out the shaft, this will take a while as the heat will soak into the shaft and everything will tighten up again. Patience is going to be your friend here. As for driving the lathe i went with a 4 pole motor as opposed to the standard 6 pole and used a VSD to drive it, which greatly improved the flexibility.

    Regards

    Tom

  10. #55
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,436

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    Hi Flo, Guys,

    Mmm, sounds like a bit of heat could be in order. That shaft must come out from one side or the other though.

    One thing bothers me, if there are keys holding the gears to the shaft, how did they put them in there, in the first place. Do the spacers have slots in them for the keys to fit through ?

    I can't see that the shaft would be assembled and then the bushings inserted, though why would retaining plates be fitted ?
    Best Regards:
    Baron J.

  11. #56
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    71
    Posts
    5,942

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    Quote Originally Posted by BaronJ View Post
    Hi Flo, Guys,I can't see that the shaft would be assembled and then the bushings inserted, though why would retaining plates be fitted ?
    I've seen where a shaft is assembled inside a gearbox, then the bearings fitted.
    I still say that the bush/s needs to be screwed out, it seems to be only half a thread showing, and a retaining plate/cover wouldn't be able to be screwed on that small amount. Plus why would they have 4 holes in the bush support.
    Kryn
    To grow old is mandatory, growing up is optional.

  12. #57
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

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    Quote Originally Posted by BaronJ View Post
    Hi Flo, Guys,

    Mmm, sounds like a bit of heat could be in order. That shaft must come out from one side or the other though.
    I'm having similar thoughts about needing heat.

    One thing bothers me, if there are keys holding the gears to the shaft, how did they put them in there, in the first place. Do the spacers have slots in them for the keys to fit through ?

    I can't see that the shaft would be assembled and then the bushings inserted, though why would retaining plates be fitted ?
    Hopefully I'll be able to answer this in the near future. Regarding the spacers I think they do have slots/keyways as they don't rotate on the shaft but they do move laterally somewhat..

  13. #58
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

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    Quote Originally Posted by KBs PensNmore View Post
    I've seen where a shaft is assembled inside a gearbox, then the bearings fitted.
    I still say that the bush/s needs to be screwed out, it seems to be only half a thread showing, and a retaining plate/cover wouldn't be able to be screwed on that small amount. Plus why would they have 4 holes in the bush support.
    Kryn
    I'm not sure I follow you.. The thinner of the two bushes is already out.. it just slides out easily. The retaining plates are bolted in four places with a good 8 -10mm of thread contact on each bolt.

    20190716_180639L.jpg

  14. #59
    Join Date
    Dec 2011
    Location
    Rosebery/Eastlakes
    Posts
    115

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    Well the journey of discovery continues and I am pleased to say that I won the battle! The answer to the mystery is the gears on this shaft are retained by their own woodruff key and the shaft comes out from the bed end.

    I tried making a screw type press but it wasn't beefy enough and with the load that I was applying it started bending and the shaft didn't budge.. so ditching that idea I broke out the propane torch and with brute force I was able to inch the shaft out.. Interestingly, removing the shaft confirmed that this lathe is an 8.5" New Visby (pic 1)..

    20190720_205021.jpg 20190720_205144.jpg 20190720_205151.jpg

  15. #60
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,436

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    Hi Flo,

    That is brilliant Success at last. It is surprising what a bit of heat can do.

    I hope that you have kept the keys that belong to each gear together. just in case...
    Best Regards:
    Baron J.

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