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Help: 9F Front Piston Cover

Discussion in 'Steam Traction' started by joe_issitt, Apr 2, 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, Apr 2, 2018
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  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, Apr 2, 2018
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  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, Apr 2, 2018
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  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, Apr 2, 2018
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  5. std tank

    std tank Part of the furniture

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    Which 9F is this?
     
    std tank, Apr 2, 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, Apr 2, 2018
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  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, Apr 2, 2018
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  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, Apr 2, 2018
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  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, Apr 2, 2018
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  10. 32110

    32110 Member

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    92203?
     
    32110, Apr 2, 2018
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  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, Apr 2, 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, Apr 2, 2018
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  13. std tank

    std tank Part of the furniture

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

    joe_issitt New Member

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    Yes - sorry it is for 92203.
     
    joe_issitt, Apr 2, 2018
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  15. class8mikado

    class8mikado Part of the furniture

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    92134 ?
    70000 ?
     
    class8mikado, Apr 3, 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, Apr 3, 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, Apr 3, 2018
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  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, Apr 3, 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, Apr 3, 2018
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  20. RLinkinS

    RLinkinS Member

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