Making an alloy tube with internal grooves

  1. maxiboy Member

    Messages:
    34
    Location:
    Carmarthenshire
    Is it possible to recreate this plastic part in alloy..

    looked on ebay and a 2.5 inch oil filler cap can be had which is about ideal

    but machining an alloy tube with the internal splines .. can this be done

    tube is 28mm around 3mm wall thickess

    asking as original part NLA
     
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  2. barking mat

    barking mat Barking at Pigeons

    Messages:
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    Location:
    Brittany, The Arz Valley.
    Can't you buy one?

    Looks complicated internal splines.
     
  3. hotponyshoes Member

    Messages:
    3,398
    Location:
    Somerset. Uk
    Its possible. What tools have you got?
    If you had to do it by hand and it's a one-off then I would look for a bit of alloy tube the right size make a couple of guide blocks from sheet alloy/wood and cut the grooves out with a set of files.
    A belt on an air file cut to the right width would do a lot of the work for you..

    What's it for?
     
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  4. Hood

    Hood If it walks like a duck....

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    If the original was plastic why not get it 3d printed?
     
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  5. hotponyshoes Member

    Messages:
    3,398
    Location:
    Somerset. Uk
    I have seen things a lot like that on car seat adjusters.
    Maybe go for a wander round a scrap yard.
    Are the spines even vital, could you just get something else that fits and glue/bond it on?
     
  6. Dee J Member

    Messages:
    309
    Location:
    Devon UK
    There's always ways. Depends if you want 1, 10 or 10000. For 1, as a repair on a machine then there's plenty of labor intensive tricks which could work (eg index on lathe and use lead screw to advance a custom ground cutter). For 10 then there are commercial broaching techniques for blind holes, for 10000 get them die-cast.
     
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  7. maxiboy Member

    Messages:
    34
    Location:
    Carmarthenshire
    yes thats why i was wondering it got three splines either side rest is smooth

    its a car seat adjusters im not sure i can find another might try a scrap yard visit splines are vital
     
  8. maxiboy Member

    Messages:
    34
    Location:
    Carmarthenshire
    yes i might if i can get it drawn up was just wondering about alloy ones
     
  9. Ruffian Member

    Messages:
    2,629
    Location:
    Devon UK
    What's it off of??
     
  10. Agroshield Member

    Messages:
    1,389
    Do you have access to the male spline? Is it steel?

    Make a thin wall alloy sleeve that is a close fit on the male part and then put it in a wire rope swaging machine and squeeze hard (a cheap cable crimping machine might do, with a custom circular die or a decent press).

    You might have to experiment with the thickness of the squeezed part. It would 100% need to be smaller than the finished OD of the part, but you can loctite your splined part into a suitable larger dia. piece both to give it strength against spreading out again and to get to the final dia. required.
     
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  11. Brad93

    Brad93 M J B Engineering

    Messages:
    10,397
    Location:
    Essex
    As said if you have a lathe you could use the gears to index the splines and use the carriage to broach the part.

    If you know someone with a slotter you could set the part up in chuck on a dividing head and slot the splines.
     
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  12. bricol Member

    Messages:
    1,531
    N.Yorks, UK
    Bore out the alloy, glue the plastic splined bit in it.
     
  13. Munkul

    Munkul Jack of some trades, Master of none

    Messages:
    3,157
    Location:
    Cumbria
    What are the splines to do? Just for friction? If that's so, then forget the splines altogether and use a single machined groove with an O ring in.

    EDIT: just realised I misunderstood, it's not an oil cap itself is it lol
     
  14. 8ob

    8ob Forum Supporter

    Messages:
    6,722
    Location:
    moscow on thames
    Ali casting?
     
  15. Hood

    Hood If it walks like a duck....

    Messages:
    12,596
    Location:
    Carnoustie, Scotland
    Should be easy to model, if you give me the dimensions I will give it a go.
     
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  16. maxiboy Member

    Messages:
    34
    Location:
    Carmarthenshire
    its of the lumber support mechanism for a seat in an alfa gta... parts no longer made..

    have ordered the lumber supoort mechanism at a cost of 150 quid so will get a better idea of the matching part ( also Plastic ) ( both snapped ) when it arrives in a week and will get some dimensions up then.. thanks
     
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  17. Ruffian Member

    Messages:
    2,629
    Location:
    Devon UK
    If you got the other spine part,
    Then can cover it in releasing agent and make a mould from it and can do it that way.

    Ie resin inside a pipe and make the spines that way.
     
  18. slim_boy_fat

    slim_boy_fat Forum Supporter

    Sorry to ask the obvious question, but aren't they available from specialist breakers? :dontknow:
     
  19. MattF

    MattF Member

    Messages:
    10,746
    Location:
    South Yorkshire, England
    You didn't ask the other obvious question: Why is he supporting wood on the seat? :D
     
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  20. slim_boy_fat

    slim_boy_fat Forum Supporter

    Just you behave yoursel' :rolleyes: :D
     
    MattF likes this.
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