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My pcp project

Discussion in 'Gun Gallery' started by shipto, Sep 16, 2007.

  1. shipto

    shipto Active Member

    Messages:
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    Location:
    Redditch, UK
    I recently got hold of a copy of "The modern pneumatic airgun - H. M. Buckley" because I wanted to have a bash at making one for myself. So my cheapo BAM XS-B20 kindly volunteered to sacrifice itself, here's the barrel turned down to 12.5mm
    [​IMG]
    next is the part finished pellet probe, I wont turn the grips until I have it in place and have marked the best place for them.
    [​IMG]
    Then its the striker valve with its nylon and O ring glued on and the spring attached. I am not sure this is the best way to do this part and may before the end of the project make another, we shall see.
    [​IMG]
    Finally is part of the filling valve with the spring and O ring, nothing really special about this it lets me fill my gun.
    [​IMG]
    Next a picture of the parts so far all labelled
    [​IMG]
    And finally the assemblies so far
    [​IMG]
     
  2. Vodster

    Vodster Newbie

    Messages:
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    Location:
    Gloucestershire
    Be interesting to see how this develops - Keep us posted.

    Vince
     
  3. shipto

    shipto Active Member

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    Location:
    Redditch, UK
    Only the one pic today but theres a lot of work in these bits (mostly due to having to make do with what I could get my hands on rather than the ideal sizes).
    The barrel block (I have decide to make the breech in 3 parts) has a radius milled out so it fits snug onto the tube which will contain the hammer. The barrel is a nice tight fit and I am thinking it will not need a O ring, some loctite should seal it very well. the front black bit is the air receiver and has yet to be drilled and tapped to accept the brass parts shown above.
    the striker valve housing will fit into the aluminium part of the hammer assembly, this is too long at present and once I have drilled and tapped the air receiver I will cut it down to suit.
    I still have other things to do with the parts shown this time but I decided to show them anyway.
     
  4. shipto

    shipto Active Member

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    Location:
    Redditch, UK
    Scrap last post I have decided now to make the breech a one piece after all. the main reason I wanted to make it in 3 sections was limited space on my tiny lathe to do the work.
    So heres the fruit of the lathe for today:
    1st pic shows the barrel end, I have been fortunate (or skillfull, you decide:D) in that once again the barrel is a nice tight fit. Also shown is the new pellet probe I made today which is a tighter fit into the 5.5mm bore.
    I still need to mill a 20mm opening down to the bore for me to place my pellets.
     
  5. shipto

    shipto Active Member

    Messages:
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    Location:
    Redditch, UK
    OK heres the latest progress picture. I have milled the breach so I can insert pellets and the pellet pushrod has a screw in the bottom so it cant come out now. Its not as smooth as I would like but I will probably solve that at a later date.
    I have started the hammer just need to decide which of the many springs I will use for it so I can turn the recess for it. Just under that is the end cap for the hammer housing.
    I was lucky enough to find a nice end piece for the pellet pushrod too.
    As you can see by the holes I have had all this together (forgot to take picture I am afraid) and it all goes together nicely. the main thing thats worrying me at the moment is the striker valve housing. Its not perfectly straight and I think there may be a kink along the length of these bits.
     
  6. shipto

    shipto Active Member

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    Location:
    Redditch, UK
    trigger assembly is almost done [​IMG] The mechanism still needs to be polished, hardened and repolished to make sure it does not bind but here are pics in cocked position and fired position.
     
  7. shipto

    shipto Active Member

    Messages:
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    Location:
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    silencer :)
     
  8. dom

    dom Well-Known Member

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    Location:
    lincolnshire
    looking good shipto is everything going aswell as hoped.:up:
     
  9. shipto

    shipto Active Member

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    Location:
    Redditch, UK
    Its getting there. I have most of the bits made and ready to go. I have to remake the striker valve due to a little threading error but that wont take long once I have figured out where my daughter has thrown the die. Then it will be a case of charging it up.
     
  10. shipto

    shipto Active Member

    Messages:
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    Location:
    Redditch, UK
    Here we have most of the pieces together.
    I still have some things to make but its looking ok so far. there is a brace for the barrel, Although I am having second thoughts about that. I think the floating barrel style looks kinda neat but I spose they are real easy to bend like that. I put it together to see if there was a chance of reusing the old stock and I think it will work.
     
  11. FXpoacher

    FXpoacher Engaging Member

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    What happened?.
    Did it work?
    Did you scrap it??
    WHAT HAPPENED NEXT!!!!
     
  12. sga 08

    sga 08 Well-Known Member

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    Location:
    gloucester tredworth
    what scilncer is that let me know but that is very very good job :up:
     
  13. a1gunner

    a1gunner Pro Poster

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    Location:
    Cardigan
    well he tried filling it with air:D
    [video=youtube;H1sS1TmXF38]http://www.youtube.com/watch?v=H1sS1TmXF38&feature=related[/video]
     
  14. shipto

    shipto Active Member

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    Location:
    Redditch, UK
    Sorry folks but I have had to shelve this project for a while. Other things got in the way. I did fill it to 200bar with no problems and actually shot a few pellets through it.
    However after filling and shooting those few pellets the "O" ring seal blew and I tried many time to get a good seal with a solid striker valve. After many attempts the "other" things turned up and I have not got back to it.

    SGA08 I made the silencer myself it is merely 2 ali ends, a bit of ali tube from a photocopier, 2 penny washers and 2 springs.

    So as you can see I didnt blow myself up filling it:D
     
  15. Leeman

    Leeman Busy Member

    Messages:
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    Location:
    Manchester
    I sure glad that your work is better than your photos:D:D..just jidding mate

    I personally do not like free floating as i think i am going to knock it somewhere and damage the breech or barrel.

    Do you have any idea on how much air your tank will hold and at what BAR.?

    Cannot wait for the follow up:)
     

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