Can this be machined?

  1. Jonathan Webb

    Jonathan Webb Member

    Messages:
    337
    Location:
    West Sussex, England
    Hello,
    I'm looking at buying this thing in the picture but te inner part would need to be machined from 25mm to 25.4mm. Would the fact that it is split make this impossible or could a lathe shrug off the joints?
    Many thanks
     
    • Cutter1a_piece.jpg
  2. Hood

    Hood If it walks like a duck....

    Messages:
    12,618
    Location:
    Carnoustie, Scotland
    Do them all the time. Both the strippers as per your pic and the Spurs.

    Just put a spacer in the gap and clamp up then turn out.
     
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  3. Brad93

    Brad93 M J B Engineering

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    10,401
    Location:
    Essex
    What is it?
     
  4. Hood

    Hood If it walks like a duck....

    Messages:
    12,618
    Location:
    Carnoustie, Scotland
    Looking closer at your pic it actually looks like there has been an insert put in there, normally that is not there unless it is a thing on the smaller sets, usually the ones I work with are 1.1/2" upwards.
     
  5. Hood

    Hood If it walks like a duck....

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    12,618
    Location:
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    Its a Stripper :D

    It is a type of rope cutter that goes behind the prop on boats.
     
  6. Jonathan Webb

    Jonathan Webb Member

    Messages:
    337
    Location:
    West Sussex, England
  7. Brad93

    Brad93 M J B Engineering

    Messages:
    10,401
    Location:
    Essex
    Interesting. Should be do-able as @Hood said. 4 jaw chuck, clamp some sacrificial aluminium in the gaps and take one skim out of the bore 0.2mm will take you out to inch.
     
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  8. Jonathan Webb

    Jonathan Webb Member

    Messages:
    337
    Location:
    West Sussex, England
    I'm trying to work the parts out the instructions aren't great for my purposes. Yes it's a tiddler: my boat's only lickle. Thanks, though as the main thing is it's doable. I haven't got a lathe & woud get it done locally but didn't want to buy it and then find it couldn't be machined. Cheers.
     
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  9. Jonathan Webb

    Jonathan Webb Member

    Messages:
    337
    Location:
    West Sussex, England
    Thanks Hood & Brad. I'll go for it then
     
  10. Hood

    Hood If it walks like a duck....

    Messages:
    12,618
    Location:
    Carnoustie, Scotland
    As said I don't think it is normal to have that spacer/bush in there. Looks to me like they have been made to fit a smaller shaft than originally intended.
     
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  11. Brad93

    Brad93 M J B Engineering

    Messages:
    10,401
    Location:
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    Measure the Bush. Could just then make up a new bush and the stripper wouldn’t have to be touched at all.
     
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  12. Hood

    Hood If it walks like a duck....

    Messages:
    12,618
    Location:
    Carnoustie, Scotland
    This is what it should be like.
    ScreenHunter 1480.jpg


    They have added in a bush to reduce the size. My concern with that would be the physical size of the stripper may be too big for your prop size.
     
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  13. Jonathan Webb

    Jonathan Webb Member

    Messages:
    337
    Location:
    West Sussex, England
    Yes, I couldn't work it out... That's an interesting point wrt overall size. However, I went & pulled the trigger on it after you reply, so will find out in a few days time. It was priced to be worth the gamble - these things are not cheap as you know. If it's too big I can sort out the minor niggles & sell it on but hope it's OK.
     
  14. Hood

    Hood If it walks like a duck....

    Messages:
    12,618
    Location:
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    As long as the hub is not bigger than the boss of your prop you should be ok.
     
  15. Brad93

    Brad93 M J B Engineering

    Messages:
    10,401
    Location:
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    Just stainless aren’t they? Could make one of those on the plasma and weld it to a hub then finish bore it to size.
     
  16. Hood

    Hood If it walks like a duck....

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    Location:
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    They are cast and not sure exactly the type of stainless but they have to keep a decent edge so I think 316 would be too soft.
    A bit more to them than just welding bits to a hub, they have to be fairly well balanced, personally I prefer the Spurs type although the strippers have a better designed keeper. Then again if I am fitting the Spurs to a boat I make up a full circle bracket for the keeper.
     
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  17. barking mat

    barking mat Barking at Pigeons

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    Location:
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    Don't they fit on the woodruff key on the prop?
    And it wouldn't it need to be conic?
     
  18. Hood

    Hood If it walks like a duck....

    Messages:
    12,618
    Location:
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    They fit behind the prop on the straight of the shaft.
     
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  19. barking mat

    barking mat Barking at Pigeons

    Messages:
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    Location:
    Brittany, The Arz Valley.
    Curious.
    Our props are conic where you put the prop then threaded.
    Maybe I'm explaining myself badly.
     
  20. Seadog

    Seadog Forum Supporter

    Messages:
    6,984
    Location:
    NE London - UK
    You mean that your props are on a taper, quite normal. the threaded bit is what's not clear. To me at least :D

    Is the thread some sort of adjustment on a stuffing gland or the cutlass bearing? Not really had any experience that low down :rolleyes:
     
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