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A Moment Of Madness?... Inspirational?... Or A Flash Of Genius?....... You Tell Me!!!!!

Discussion in 'Technical' started by Halinfax, Sep 9, 2021.

  1. Halinfax

    Halinfax Full time tinkerer and general all round nice guy

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    Gentlemen.....

    Todays Tinkering has been a “bit of a do” for a number of reasons… However, it was a task that had to be undertaken… and I was the person charged with its undertaking….(and foolish enough to accept)….

    Some of the “purists” amongst you will baulk and be enraged at the concept of this fusion… but it was an idea, a concept, a drunken moment of lucidity…. Either way… it HAS been undertaken.

    We start with the patient… an SMK B2 .22 barrel with as much inherent accuracy as a kick to the nuts…

    Cheap, inaccurate, flawed and Chinese!!

    The Donor… a pristine Weihrauch 99 .22 barrel .

    And then there is myself… a Frankenstein of the air rifling world.. locked in the laboratory… er shed.. given a plethora of bits and asked to make a thing of consummate beauty and function…

    The Owner of this fusion of HW99 barrel and B2 breech block has named it HWB2…. and this is how the items arrived....
    20210907_113410.jpg

    In order to undertake this transformation, it was necessary for the B2 barrel to be removed from its own breech..

    I have been reliably informed that a copious amount of hammering and much abusive insulting finally freed the piece of 15mm ex Russion tractor drive shaft from its captive breech…

    An then, the HW 99… engineering at its best (vorschprung durch Teknic) a beautifully crafted steel shaft, turned, splined, screwcut and held in place in the breech by the locking ring that you would never be able to remove unless you had the special locking key..

    And I don’t think Mr HW hands them out willy nilly…..

    Out came the grinder.

    The HW purists amongst you … LOOK AWAY…..

    2 cuts to the left and top of the breech released the barrel and all its engineering acumen from its captivity…
    20210907_143412.jpg

    Now was the task of forging the HW to suit the B2 and as the diameters are a world apart, it was necessary to machine the HW barrel breech end to 10mm x 30mm long in order to be able to sweat a steel sleeve onto it for machining to suit the 12.75mm diameter of the B2 breech.

    The sleeve was made and sweated onto the breech end of the barrel and allowed to cool..
    20210907_154759.jpg 20210907_163708.jpg 20210907_164251.jpg

    The barrel was clocked up to within 0.10mm TIR (bore) and the diameter was turned to 12.78mm suit the B2 breech (with a little bit of polishing allowance for fitting to the slightly tapered B2 breech bore…
    20210907_164816.jpg

    Next.. the ubiquitous HW99 dovetailed barrel end had to be clocked up concentric and the end machined for a ½” UNF thread. A TIR of 0.03 was maintained whilst the thread was screw cut…..
    20210907_150411.jpg 20210907_150423.jpg 20210907_151456.jpg 20210907_153600.jpg

    As the HW99 had a good crown, no work was undertaken on the faces..
    20210907_153626.jpg

    The breech end of the modified HW barrel was now machined to accommodate a breech seal that would have to somehow seal itself on a tapered breech face!!!!!

    A diameter of 7.00mm x 3mm in length was machined for the breech seal recess and the edges of the barrels pellet guide were given a nice lead in…. and everything de-burred.
    20210907_173546.jpg

    The barrel was now ready to insert into the breech…

    A little polishing, a bit of tickling and a little heat.. and the German barrel was now inside the Chinese breech. …. It was all locked in place securely….. The creation was complete……………….

    IT WAS ALIVE!!!!!!

    20210907_230522.jpg 20210908_122006.jpg

    As the old barrel/breech pin had been destroyed in its removal, it was necessary to make a new 5.02mm diameter x 16mm long barrel/breech locking pin out of silver steel. As the barrels outer diameter encroached on the pin hole, it was necessary to smooth out the encroachment of the barrels diameter to allow passage of the pin . This was done carefully by hand… (using a 3mm rat tail file and 600 grit emery … which soon sorted it all out)

    The locking pin hole had some medium strength Loctite adhesive dripped into it… and the barrel/breech locking pin was tapped home… securely locking the barrel into place…

    Next, the breech pivot pin hole had to be tickled out to 7.00mm as the barrel also interfered with the clear passage of the pivot pin…. This too was done using the 5mm smooth file and emery making sure that the 7.00mm silver steel bar was a nice snug fit…
    20210908_122021.jpg


    Next, a 3mm section x 7mm ID rubber O ring was fitted to the breech seal recess.. BUT not before making a 0.5mm PTFE ½ moon spacer for the top of the O ring to enable it to seal on the cylinder….
    20210908_122106.jpg

    Then a THOROUGH clean of the barrels inner using Hals ACME All Weather Multi Calibre Pull Through…….

    NOW, the HWB2 barrel was ready for testing on my own B2…

    The action of the rifle was cocked using my B2 barrel and cocking arm, then removed.. and replaced with the HWB2 barrel, before carefully insert a pellet, closing the action to snap the breech shut….. and then we pulled the trigger…..

    IT WORKS…..

    Another couple of attempts and each time.. everything seemed to be fine…

    Content with how it shoots, a quick clean up, and a touch up of some of the bluing before a good coat of oil.

    As I had also asked the \Owner to send me the main spring and guide... I decided to make a new spring guide (one that actually fitted the spring and did'nt allow the spring to slop about) as well as a top hat guide for in the piston.
    I also polished up the spring (because thats the sort of guy I am...)

    All the bits carefully packed and finally sent to its Owner…..
    20210908_162315.jpg

    This originally started out as an idea by the Owner… but I think that we have managed to undertake this task suitably.

    YES.. I know… that many of your Tinkering Chaps have swapped barrels before … and so its no big deal….

    But how many have stepped the quality up from the cheapest barrel imaginable to a quality item/

    I hope the Owner can respond to the functionality of the HWB2 and perhaps comment on IF he thought it was worth the effort…

    HW Owners... PLEASE.. dont hate me or think i am a bad fella!!!!!!....
     
    AmBraCol, Billios247, Andy H and 34 others like this.
  2. Billy W

    Billy W Born Ready.....

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    Engineering at it best right there! Nice work
     
    Halinfax and vinnyp like this.
  3. shadowryder

    shadowryder "whistlin' Dixie"

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    Deeside,North Wales-Cumbrian born & Bred
    Excellent work my friend,
    you did a great job on the 22 barrel work for me a wee while ago and look forward to a .177 version when you can fit it in.
    J...
     
    Halinfax likes this.
  4. vinnyp

    vinnyp Plinkin ain’t easy !

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    :claping:

    All I can say is……….

    The HWB2 has exceeded my expectations :D

    And being honest I was expecting it to be pretty good :thumb:
     
    Halinfax likes this.
  5. Grey Man

    Grey Man Big Poster

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    Like Everest ... because it's there ...
     
    Halinfax and vinnyp like this.
  6. Autodidact

    Autodidact Thought Criminal

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    Garden of England
    :claping::claping::claping:

    Well played sir (and an excellent write up) :thumb:
     
    Halinfax likes this.
  7. MrBadger

    MrBadger Busy Member

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    Mad skills right there.
    If I had a hat on, it would be tipped in thine direction
     
    Halinfax likes this.
  8. Chouchin66

    Chouchin66 Top Poster

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    Hip Hip Hooray for Hal, the man , the machine, the " Barrel Whisperer"

    .
     
    Phil Spectre, vinnyp and Halinfax like this.
  9. vinnyp

    vinnyp Plinkin ain’t easy !

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    We choose to re-barrel b2’s, not because it is easy, but because it is hard!

    We need tinkerers in this world :thumb:
     
    Chouchin66 and Halinfax like this.
  10. jesim1

    jesim1 Kit bitch to the Stars

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    Your definitely off your head, a true mad hatter of the AGF :laff:

    Well done, way beyond my comprehension of even where to start with something like this - the thin line between madman and genius has been blurred yet again :claping:
     
    Chouchin66, Halinfax and vinnyp like this.
  11. Andy yam

    Andy yam Jack of all trades

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    Hey up @Halinfax
    I'm just astounded amazing horrified and a little intrigued as to what your going to do next
    Well done young man :claping::claping:well done indeed
     
    Halinfax likes this.
  12. Lostkiwi

    Lostkiwi Tomorrow will be a good day.

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    Definitely a mad genius is our Hal....
     
    Chouchin66 and Halinfax like this.
  13. Paul55

    Paul55 Keyboard Hero

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    Wizardry at it's finest with pics to boot :thumb:
     
    Halinfax likes this.
  14. Chouchin66

    Chouchin66 Top Poster

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    If " our " Hal don't get " tinkerer of the year" ...the next election is rigged

    .
     
    Halinfax, buryal and vinnyp like this.
  15. Ray13

    Ray13 "You failed to maintain your weapon son".

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    I am in awe of your engineering talent :eek: and loved the write up. Well done :thumb:.
     
    Halinfax likes this.
  16. wezil

    wezil Keyboard Hero

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    I admire your devotion and skills, I think your daft but that's beside the point, my hats off to you.
     
    Halinfax likes this.
  17. ajohn

    ajohn Chewing Things Over

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    Interesting one @Halinfax

    TBH I would wonder about checking pellet fit and if ok adding a truly precise crown to the original barrel. To do that I would have to make an ancient item. A cup chuck with 2 rows of fine adjustment screws well spaced, say 150mm to allow a similar length mandrel in the bore to be set true to silly limits. ME threads at 40tpi are ideal for that sort of use.
     
  18. vinnyp

    vinnyp Plinkin ain’t easy !

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    Sorry for the hijack @Halinfax :facepalm:

    The problem with the original barrel was that it was closer to 5.6mm bore than 5.5mm, this meant modern pellets just rattled down the rifling and exited the muzzle with no trace of ever having contacted the lands.

    Add into the mix a breech end that was so tight it undersized the pellets even further and no amount of expert re-crowning would of been able to accurize the b2.

    Hence the decision to swap the barrel for a quality one :thumb:
     
    ajohn likes this.
  19. ajohn

    ajohn Chewing Things Over

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    I doubt if @Halinfax minds. I just thought it worth posting for people with barrel problems

    That is interesting as I have come across something similar. Barrel appears to just be crowned at each end and nothing in between - then fit it the wrong way round.
    :facepalm: Sorry for adding that.
     
    Halinfax and vinnyp like this.
  20. 1260engineer

    1260engineer The Terminator's Armourer

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    :D Can you stop messing about Hal and do some proper stuff .
    Im still trying to work out the difference between them screws with the slot on and them with the cross on :D

    Class Hal :thumb:

    Now stop messing and build your own rifle :thumb:
     
    Balders and Halinfax like this.

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