LG 200/300 Build help needed.

Discussion in 'Walther' started by Finn, Mar 17, 2020.

  1. sven

    sven Active Member

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    I have measured 24x1.0 thread
    The male thread has a 23.90 OD.
     
  2. Finn

    Finn New Member

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    Thank you, I didn't machine the internal threads yet, because I wasn't sure.
    Aluminium supplier called me just a moment ago, corona is causing delays so my aluminium brick for the frame will arrive next week instead of tomorrow. I can still make the trigger, cocking lever and few other small bits while waiting.
     
  3. Finn

    Finn New Member

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    Regulator is almost done now.
    Piston for 21 J regulator
    [​IMG]

    Reg adjustment screw
    URL="https://shooting-the-breeze.com/media/part57.8494/"][​IMG][/URL]

    Regulator valve
    [​IMG]

    Valve seat, brass part in original version but aluminium works fine
    [​IMG]

    Went with the original type air tank connector.
    [​IMG]

    Flat type valve
    [​IMG]

    Valve seal is dominator style, I used different material.
    [​IMG]


    All the parts so far, reg needs those belleville springs, trigger needs to be made and cocking lever design is not complete yet.

    [​IMG]
     
  4. Simonev2

    Simonev2 Member

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    Looking good. Looking like a good build so far.
     
  5. Finn

    Finn New Member

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    Thanks, everything has gone well so far. I'm thinking about the barrel choice, what length and caliber, I currently only have 460 mm .22 cal HW barrel. Has someone made .22 cal mod for LG, was it any good, should I stick with the .177?
     
  6. Simonev2

    Simonev2 Member

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    I’ve currently got a Lg300 carbontec barrel for sale in the for sale page.
     
  7. Finn

    Finn New Member

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    Whats your price? I can't access the sales department.
     
  8. PA410goodshot

    PA410goodshot Active Member

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    I think it is £100 reduced from £140 originaly.
     
  9. Finn

    Finn New Member

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    Now I'm getting somewhere, regulator is complete and tested.

    Reg body turning.
    [​IMG]

    Cutting twenty one belleville springs from steel bar. I made the springs 9,7 mm OD 5,1 mm ID and 0,5 mm thickness.

    [​IMG]

    I have a simple forming die to set the springs as they are cut flat.

    [​IMG]

    After pressing, spring has overall height of 0,8 mm but they are still soft.

    [​IMG]

    Springs are then flame hardened, water quench.

    [​IMG]

    I didn't take a photo of the tempering process but spring are simply heated to 300 celsius and air cooled and they are ready to go.

    Next was assembling, I also had to make the regulator tester block and few pressure fittings for probe and gauge.

    [​IMG]

    Assembled regulator, tester and pin wrench for the reg.

    [​IMG]

    Set the output pressure at 100 bar for 21 joule energy, tank is slightly low but the regulator works well. I had to take it apart twice because there was dirt in the valve, difficult to get rid of all the grime that lives in the machine shop.

    [​IMG]
     
    ksts100 likes this.
  10. PA410goodshot

    PA410goodshot Active Member

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  11. sven

    sven Active Member

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    Amazing work Finn, I have never seen someone making his own Belleville springs. Thank you for showing us how you do it.
    Keep up the great work.
     
  12. Finn

    Finn New Member

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    Thanks, keeping up is sometimes hard. I have to think about school work too, upcoming physics exam is not too far in the future.
    Sven, can you confirm the barrel to airtank center distance, it should be possible to measure on an assembled gun or if someone has extra barrel band.
     
  13. sven

    sven Active Member

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    Hi Finn,
    I hope this helps:
    I measured on my LG300 Hunter with a carbon shroud:
    Bottom of regulator to top of barrel = 55.61mm
    Barrel (shroud) dia = 19.85mm
    Regulator dia = 34.88mm
    If i'm right this makes a center barrel to center regulator distance of 28.245mm
     
  14. Finn

    Finn New Member

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    It sure looks like it 28,25 ctc dist. It is a bit strange value, I would have thought that German engineer goes for the closest half a millimeter.
    My drawing has it 28,5 mm, but not sure if my barrel is too high or reg too low.

    It is almost hard to believe, but most things I measured purely from online photos have been within half a millimeter of the real value without ever seeing the gun IRL, and some of those photos were absolutely rubbish quality.
     
  15. sven

    sven Active Member

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    I agree, I would have thought that the regulator would be 35 and the shroud 20mm. My caliper is not a Mitutoyo, so it can be a bit off. But things like drill bits and other pieces seem to be what it says on the bit.
    The shroud is carbon with a lacquer finish. This can easily be different from the specified 20mm. And the carbon shroud is glued on the barrel, so with the sum of some tolerances that may be the cause of the 'strange' dimension of center to center.
     

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