Bore polishing - what's your thoughts?

Discussion in 'General Airgun Chat' started by john0neuk, Dec 6, 2017.

  1. hmangphilly

    hmangphilly Not quite a full phil

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    42
     
  2. hmangphilly

    hmangphilly Not quite a full phil

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    Ooooooooh

    loooooooooooook


    spooooooooooooooooooky


    IMG_2484.JPG
     
  3. RobF

    RobF Administrator Staff Member

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    Or fix up an RD...
     
  4. Waldo

    Waldo Active Member

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    Who's Ena Sharples ? must be before my time :p:D:D
     
  5. hmangphilly

    hmangphilly Not quite a full phil

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    Don't give me that .

    She's top northern totty as well you know .
    If your'e telling me you ain't seen Ena Sharples and and thought ...

    "Eee by gum . Aye up chuck and where's me whippet ."

    Well I'll go to the foot of our stairs and eat my flat cap
     
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  6. hmangphilly

    hmangphilly Not quite a full phil

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    Bronze brush is pretty hard core John

    Even autosol is scratchy
    Absolutely only want to go back and forth deffo no rotation or will mark the bore .

    Had a little go with some blue vfg ? Paste .,,,, it seemed rather hand bag .

    Nag at rob to bring his scope up and we'll shove things stuff up various holes and take a few pics .

    ....,or am I on the wrong forum again
     
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  7. hmangphilly

    hmangphilly Not quite a full phil

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    Not really bore polishing but , gonna be doing something over on here ..............

    Lead in
     
  8. john0neuk

    john0neuk Well-Known Member

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    Hi Phil,

    Yes a bit radical I suppose but felt had nothing to lose. Interesting point re scratchy, hard core etc. Back in the day I was a marine engineer, being a Junior I had the wonderful job of grinding and lapping injector discs for routine maintenance on the diesel generators - we used various grades of grinding past then lapped in on surface plates. We aspired to a finish that was matt, and would friction lock on a surface plate when you slide it across it - the pastes we used were way coarser than the polishing compound I use and I would imagine autosol as well.

    Obviously never put the discs under a microscope post lapping but their job was to give a mechanical sealing face for high pressure diesel and seem to do the job if done correctly. Just wondering in reality what damage a bronze brush and also finishing with a very fine rubbing compound like autosol or a 3m equivalent to t Cut that I used against stainless or carbon steel really does do. Nor really how much the surface finish would affect a malleable lead pellet traveling down a bore. Agree the quality of lead in finish is a target area - but never really understood how a crown affects a pellet as much as it can, that's an area of ballistic science I haven't a clue on.
     
  9. hmangphilly

    hmangphilly Not quite a full phil

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    Sometimes . I adopt the approach of how would i go about messing a component up . Or what would i do to rob's gun to mess with his head ?

    It currently seems to me that as far as a barrel is concerned ,

    Poor or rough internal surface finish would be a good start for self sabotage . Even if outwardly every thing seemed in order , ( nice breech , great crown ) I would guess that the rate of lead build up would become a problem .

    I am no expert but this would seem to be born out by certain steyr barrels that lose their internal finish .
     
  10. chrisc

    chrisc Lucky git

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    I'd just like to point out that my brass brush/ carbon fibre rod rotate as the brush is moved along the barrel. I suspect it follows the lands more and is probably no where near as invasive as people think. Dan (Mitigator) has commented above that he's struggling to get his to group at all so he's now got a CZ barrel from Warren to try. I'm going to take his old barrel away and give it some luurrvv with the brash bruash and autosol. I will report back but i'll need Dan to shoot some groups with the old barrel first......not sure if he's swapped barrels over yet.
     
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  11. Dan Smith

    Dan Smith Emley extreme sh!te shot champ

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    Chris,

    Whatever I can do to bottom this I will! CZ barrel is fitted but I can put the old one back on for some testing whenever .....

    I’m going to need a big target.

    Dan
     
    Last edited: Feb 13, 2018
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  12. chrisc

    chrisc Lucky git

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    No worries Dan, not sure if you're at the club this Fri?....i'm at the shooting show on sat so that's out and we've got Keighley this Sunday.
     
  13. herx77

    herx77 Member

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    Not too sure about cleaning leaded barrel using autosol! but have used Brasso and Autosol on pull throughs when using a new springer to save shooting around 1000 pellets to help bed in barrel.It saves time and pellets and will take off any land machining protrusions.
    HERX77 .
     
  14. RobF

    RobF Administrator Staff Member

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    It won’t do that much.

    We tested bore cleaner, vfg paste, autosol, valve grinding paste and diamond grit on a barrel with machining marks on the Aeron 16mm and it did next to nothing apart from making them shiny. Only lapping made a real visible difference with the bore scope.

    I should add that we got bored with rodding by hand and we used a machine which was far more energetic than a human could muster.
     
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  15. TenMetrePeter

    TenMetrePeter 10 metre long member

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    My wife had one of those...
     
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  16. hmangphilly

    hmangphilly Not quite a full phil

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