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  1. 8th August 2012, 08:21 PM #1
    Vernonv's Avatar
    Vernonv
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    Default HELP! Lathe failure

    Hi all,
    I need help. I went to do some threading tonight and the gear train wouldn't work.

    It's a Nuttall lathe. When in position II everything works fine, but in position I I get no move gear train movement.

    As you can see in the photo below, position 1 is an 8 by reduction of position 2.


    Here is the lever that switches between position 1 and 2.


    This is position 2. Gear 1 and 2 are on the main shaft. Gear 3 is an idler that switches between pos 1 and 2. Gear 2 is fixed to the main shaft.


    This is position 1. Gear 1 must move at an 8:1 reduction compared to the main shaft - I'm not sure how, could it be some kind of planetary gear???? Anyway gear 1 just seems to turn i.e. it's like it's not connected to anything.



    Any ideas? Will I have to pull down the main shaft?
    Cheers.

    Vernon.
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  3. 8th August 2012, 08:27 PM #2
    shedhappens
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    hi Vernonv,

    what are those two gears to the right of your number three ?
  4. 8th August 2012, 08:29 PM #3
    shedhappens
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    sorry, I mean the smaller ones
  5. 8th August 2012, 08:46 PM #4
    Bryan
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    Have you used pos 1 before? Sounds like gear 1 has sheared a pin or spat a key...
  6. 8th August 2012, 08:47 PM #5
    steran50
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    HI,
    I am not familiar with these Lathes, but I wondering whether there is not supposed to be a Pin or something in the Slot between No1 and No.2 Gears. This Link is apparently the Australian Supplier of Nuttall Lathe Parts B & D Machining Pty Ltd: Nuttall Lathe Parts . I doubt that it would have Planetary Gears, I suspect that a Key for a Keyway or Pin may have Sheared off. I suggest you Drain the Oil and see if anything comes out or if this anything at the bottom of the Sump.
    All The Best steran50 Stewart

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  7. 8th August 2012, 08:49 PM #6
    .RC.
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    Are you sure they are not the feed reverse gears?

    Does the interlock work.... In the coarse feed rates you should not be able to select the high spindle speed...
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  8. 8th August 2012, 09:48 PM #7
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    Quote Originally Posted by shedhappens View Post
    hi Vernonv,

    what are those two gears to the right of your number three ?
    You mean the ones in the front? They are for the gear train - forward and reverse.
    Cheers.

    Vernon.
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  9. 8th August 2012, 09:49 PM #8
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    Quote Originally Posted by Bryan View Post
    Have you used pos 1 before? Sounds like gear 1 has sheared a pin or spat a key...
    Yep, just the other day. I'm thinking you are right about the sheared pin/key. I think I will have to strip it down.
    Cheers.

    Vernon.
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  10. 8th August 2012, 09:53 PM #9
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    Quote Originally Posted by .RC. View Post
    Are you sure they are not the feed reverse gears?

    Does the interlock work.... In the coarse feed rates you should not be able to select the high spindle speed...
    The reverse gears are in front and down.

    Interlock? ... I didn't know it had one. I will have to have a look at that. However I never run the coarse threads on a fast speed.
    Cheers.

    Vernon.
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  11. 8th August 2012, 09:58 PM #10
    Bryan
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    Do you have info on the spindle bearings? Like how to adjust them?
  12. 8th August 2012, 10:03 PM #11
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    Vernon if you need I can pull the top off mine tomorrow night and check gear movement etc. Also note that I will soon have a spare Nuttall for sale.

    Dean
  13. 8th August 2012, 10:27 PM #12
    .RC.
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    Quote Originally Posted by Vernonv View Post
    The reverse gears are in front and down.

    Interlock? ... I didn't know it had one. I will have to have a look at that. However I never run the coarse threads on a fast speed.
    Ahh yes I see that now about the reverse gears...

    I had a nuttall like that many years ago and like most lathes you could not select the coarse feed and high speed... I see it even says on the plate next to the II "Available with slow spindle only"

    I would have thought with a sheared key it would still be stiffish and not free running...

    With both gears at the same size it means they are not supposed to spin at the same speed..

    Are there any gear trains hidden directly under the spindle hidden under the oil?

    Would you have a picture of the entire headstock gears?
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  14. 8th August 2012, 11:03 PM #13
    shedhappens
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    RC said,
    "I see it even says on the plate next to the II "Available with slow spindle only"

    it seems funny, the lever to the right is in the fast position, so by my way of thinking that feed gear should not have engaged in position 2 ?

    or was it not in that position when testing the gears ?
  15. 9th August 2012, 08:00 AM #14
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    Hi all,
    Thanks all. Just a quick update - it was a sheared key.






    Anyone have any tips on how best to adjust the tapered roller bearings on reassembly?


    Cheers.

    Vernon.
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  16. 9th August 2012, 08:45 AM #15
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    Quote Originally Posted by Oldneweng View Post
    Vernon if you need I can pull the top off mine tomorrow night and check gear movement etc.
    Thanks for the offer, but I'm right for now.
    Cheers.

    Vernon.
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