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Help: 9F Front Piston Cover

Rasprava u 'Steam Traction' pokrenuta od joe_issitt, 2. Travanj 2018..

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  1. joe_issitt

    joe_issitt New Member

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    Afternoon all,

    I am looking for a pattern, or better yet still, to borrow a 9F piston front cover for a while. If anyone knows or has any contacts that may allow us to borrow the pattern or cover - please let me know!

    During routine inspection, we found our RHS piston cover has a crack, making the engine serviceable... Bit of a nightmare to be honest!

    Thanks
    Joe Issitt
     
    joe_issitt, 2. Travanj 2018.
    #1
  2. 32110

    32110 Member

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    Have you investigated getting it metal stitched as performed by the likes of Metalock and others?
     
    32110, 2. Travanj 2018.
    #2
  3. joe_issitt

    joe_issitt New Member

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    I know one of the covers has been stitched last year, and I am not sure if it is the same one. I've just been asked to see if we a pattern or 'spare' available.

    From the picture (and its not a good one) I've seen it doesn't look particularly good.
     
    joe_issitt, 2. Travanj 2018.
    #3
  4. AndyY

    AndyY Member

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    Why can't a cracked cover be used as a pattern? Glued together if need be.
     
    AndyY, 2. Travanj 2018.
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  5. std tank

    std tank Part of the furniture

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    Which 9F is this?
     
    std tank, 2. Travanj 2018.
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  6. ilvaporista

    ilvaporista Part of the furniture

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    Have you any contacts in the BR Standards Owners Group?
     
    ilvaporista, 2. Travanj 2018.
    #6
  7. std tank

    std tank Part of the furniture

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    I am here. I just want to know the loco first.
     
    std tank, 2. Travanj 2018.
    #7
    ilvaporista se sviđa ovo.
  8. ilvaporista

    ilvaporista Part of the furniture

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    You can't get any closer to the horse's mouth.... Best point of contact for anything Std. related!
     
    ilvaporista, 2. Travanj 2018.
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    std tank se sviđa ovo.
  9. Lplus

    Lplus Well-Known Member

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    From his previous posts I'd say it's whichever 9F is at the NNR...
     
    Lplus, 2. Travanj 2018.
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  10. 32110

    32110 Member

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    92203?
     
    32110, 2. Travanj 2018.
    #10
  11. martin1656

    martin1656 Nat Pres stalwart Friend

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    I'm sure there must be at least a pattern is the cylinder cover the same on Any other standards such as the Britannia's or the Std 5's
     
    martin1656, 2. Travanj 2018.
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  12. std tank

    std tank Part of the furniture

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    Thanks, I will send him a PM.
     
    std tank, 2. Travanj 2018.
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  13. std tank

    std tank Part of the furniture

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    PM sent to you.
     
    std tank, 2. Travanj 2018.
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  14. joe_issitt

    joe_issitt New Member

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    Yes - sorry it is for 92203.
     
    joe_issitt, 2. Travanj 2018.
    #14
  15. class8mikado

    class8mikado Part of the furniture

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    92134 ?
    70000 ?
     
    class8mikado, 3. Travanj 2018.
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  16. class8mikado

    class8mikado Part of the furniture

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    Cast objects are generally made oversized to allow any faces required to be smooth/ accurate to be machined. finished items have already been through this process so you would have to build up the machineable faces ... #might as well make a pattern
     
    class8mikado, 3. Travanj 2018.
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  17. huochemi

    huochemi Part of the furniture

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    Plus the shrinkage allowance for the casting from the pattern. So if you use a finished object as the pattern, it will be undersize as a rough casting.
     
    huochemi, 3. Travanj 2018.
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    class8mikado se sviđa ovo.
  18. Steve

    Steve Resident of Nat Pres Friend

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    Original items have been used as patterns for probably as long as casting has been around. It depends on what is being reproduced. Complex castings or those requiring cores won't reproduce but I bet there isn't a moulder alive that hasn't produced a mould from an original with a bit of 'wiggling it around' in the sand.
     
    Steve, 3. Travanj 2018.
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  19. RLinkinS

    RLinkinS Member

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    Castings need a shrinkage and machining allowance. pehaps laser scanning, allowances added in CAD and then a polystyrene pattern.
     
    RLinkinS, 3. Travanj 2018.
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  20. RLinkinS

    RLinkinS Member

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    But I bow to Steve's greater knowledge.
     
    RLinkinS, 3. Travanj 2018.
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