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threading a barrel?????

Discussion in 'Anything Airgun Related' started by highland chief, May 1, 2014.

  1. highland chief

    highland chief Donator

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    hi guys

    I want to get a rifle barrel threaded to take a moderator, can this be done by hand, I mean with a tap and die set? I know it has to be done to 1/2 " unf.

    any info would be much appreciated.

    cheers
    gus
     
  2. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    ffs don't do it by hand - that's got to be a perfect way to ensure your rifle never shoots straight again.

    You definitely want a lathe and a man who knows how to use it; preferably with experience of gunsmithing work :)
     
  3. highland chief

    highland chief Donator

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    thought so mate, just thought I would get this clear in my mind, I am not into working with metal, only wood.

    thanks a lot.

    gus.
     
  4. terry1001

    terry1001 Major Poster

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    I agree except that it's really essential that the machinist has experience of gunsmithing. Ideally the barrel needs to be removed from the receiver and clocked up in the lathe so that it is running true on the chamber and the muzzle to ensure that the threading is done exactly true to the bore. There's some decent videos on Youtube showing how it's done.
     
  5. r10hunter

    r10hunter Honorary Member

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    Yes it can be done by hand. But it is a special tool that has a guide pin that goes inside the barrel. Leaving a thread sticking out that the die runs down on to ensure it's aligned. The barrel obviously has to be turned to the correct size if it's not already.
    An adaptor is much easier on an air rifle.
    Cheers Andy
     
    Last edited: May 1, 2014
  6. highland chief

    highland chief Donator

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    cheers mate,

    I emailed a few RFD,s near me, not one knows anyone who can do this. so thanks again for the replies.

    cheers

    gus.
     
  7. supersniper

    supersniper Busy Member

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    I have done quite a few and am a Mech Eng by trade.... The barrel would need to be turned down to the correct size to be threaded 1/2"UNF is the usual airgun silencer. With a thread starter and die set the thread could be put on by hand. It is always best to do it in a lathe and I much prefer to screw cut as it gives a better thread and can be checked before finish cuts for fit ,where a die nut is one hit.
    The thread wouldn't need to be absolutely perfectly straight as all air rifle silencers I've used align by the two square faces butting together(this needs to be turned concentric and square true to the bore). A slightly squiff thread wouldn't stop this. Undo you silencer yourself see how slack the threads are!!!

    SS
     
    Last edited: May 1, 2014
  8. highland chief

    highland chief Donator

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    thanks again guys. extremely helpful as usual. :up:, I will think about this.

    cheers

    gus.
     
  9. PhilD

    PhilD Donator

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    only an animal would thread a barrel with a die
     
  10. highland chief

    highland chief Donator

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    that's the reason I asked on here mate, for advice.

    cheers

    gus
     
  11. oldbugger

    oldbugger Donator

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    im glad you asked Gus , cos i was wondering the same thing,for a project im on with, i do know an engineer with a lathe,:D but he,s no gunsmith tbh:eek:
    as the old saying goes, "the only stupid question,is the one you should have asked" but didnt :up:
    anyway atb
    Andy/oldbugger
     
    Last edited: May 1, 2014
  12. Bemused

    Bemused Engaging Member

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    Surely simple for any machine shop to cut the thread with a lead screw so long as you remove the barrel for them and explain the thread needs to be concentric with the bore and that the barrel OD is probably off centre with the bore.
    I did my Airmagnum in an old and small Myford with just a little shim and patience with a four jaw chuck and I'm not a machinist.
    Certainly dont try to run a dia down the barrel yourself!
     
  13. PhilD

    PhilD Donator

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    [​IMG]
    [​IMG]
    [​IMG]
    all barrel work should be done between centers by some who really knows what they are doing or you end up with a jack handle
     
  14. highland chief

    highland chief Donator

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    very nice,:up:

    cheers

    gus.
     
  15. Igotknobblies

    Igotknobblies Engaging Member

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    What sort of barrel? Fixed under lever., break barrel, pre charged etc. What is diameter is the barrel at the muzzle? I'm from East Kent and could do this if you're local....Cheers, IGK
     
  16. stevemandm

    stevemandm Honorary Member

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    dont do it gus. the best way is to mount the barrel in a lathe, clock the bore up true, turn the outer diameter to 1/2", form a clean and true 90 degree face for the mating face of the silencer, undercut this face and screwcut with a singlepoint tool. it can also be done on a lathe with a diebox, but the results are hit and miss (and you only get one chance). in theory, it can also be done on a lathe with a die, but this is really bad practice, and seldom yields good results.
    you dont have to be a gunsmith to do it, just a competent engineer with the correct tooling and turning experience. any local jobbing shop can probably do it (cost maybe £20 if you take in the barrel), or a local hobbiest.
    as said earlier, why not just get an adaptor, or ask mattw975 for a custom one to fit over the barrel and be located by grubscrew.
     
  17. Bemused

    Bemused Engaging Member

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    Try to seek out your local "men in sheds" group
     
  18. Freckle

    Freckle Newbie

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    dont mean to hijack, ive got a similar question for the AA TX200, would a pillar drill be accurate enough for the drilling, and tapping by hand?
     
    Last edited: May 1, 2014
  19. r10hunter

    r10hunter Honorary Member

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    Many firearm barrels have to be threaded by hand as removing the barrel is not always possible.
     
  20. PhilD

    PhilD Donator

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    that would be even worse the stresses of using a die will affect the barrel at a molecular level so not a good idea at them pressures.
     

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