A few more barrel pics

Discussion in 'General Airgun Chat' started by SteveC200, Jan 7, 2018.

  1. SteveC200

    SteveC200 Active Member

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    Just to throw them into the mix. Both good barrels, the AR20FT does 1/2" groups at 50 yards, the Daystate MK3 does sub 10mm groups at 50 yards. Bare in mind both rifles use a probe for pellet poking so the lead in is quite gradual.

    Daystate crown.

    [​IMG]

    [​IMG]

    Daystate lead in.

    [​IMG]

    AR20FT Crown

    [​IMG]

    Ar20 lead in

    [​IMG]
     
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  2. Waldo

    Waldo Active Member

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    Both those crowns look miles better than the R10 Rich, very good pictures m8:)
     
  3. RobF

    RobF Administrator Staff Member

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    Daystate lead in has some rings in the lands hey...
     
  4. SteveC200

    SteveC200 Active Member

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    Rich???o_O
     
  5. SteveC200

    SteveC200 Active Member

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    Yes but the pellet is pushed well past them by the probe so possibly wont matter?
     
  6. RobF

    RobF Administrator Staff Member

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    True. I always forget a sense of scale with this stuff...
     
  7. SteveC200

    SteveC200 Active Member

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    One thing of note perhaps is that neither crown shows any machining marks at all, particularly compared to other crown pics that have been posted.
    Also the Daystate crown seems to be quite gradual compared to the AR20 but does look like it has some marking along the lands. The AR20 seems almost perfect.
     
  8. RobF

    RobF Administrator Staff Member

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    What I'm finding is the type of lighting used makes a big difference to what you see... my setup seems to almost emphasise the marks which is good for analysis but not maybe for comparison.

    I'm going to try and make a setup which is more consistent so as I go through the barrels we can see the differences better or at least know they are different when they look different.

    The AR lands look flatter and wider than the Daytstates.
     
  9. Waldo

    Waldo Active Member

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    Ops Sorry Steve ,senior moment :oops:
     
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  10. cloverleaf

    cloverleaf Active Member

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    Interesting stuff... note also the "twin" transfer ports in the AR20 - potentially a nice trick to increase the port flow area and allow the use of a lower reg output pressure :)
     
  11. SteveC200

    SteveC200 Active Member

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    Hadn't noticed that. Interesting, as I believe both use LW barrels. Daystates own specs perhaps?
     
  12. SteveC200

    SteveC200 Active Member

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    Theres actually 4 ports. Then theres a groove cut around the outer barrel connecting them all, directly above tbe TP. Quite a nice design.

    I'm getting a AR20 reg adapter made that screws into an EV2 checker so I'll be able to find out what pressure it runs at soon.
     
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  13. hmangphilly

    hmangphilly The Doctor

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    Smooth isn't it .
    even the surface outside of the chamfer looks super smooth too .

    how do they do that
     
  14. Yorkshiretea

    Yorkshiretea B Grade Bandit

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    I've got a couple of FTP 900 barrels that look smooth, pictures to follow later tonight once I've got PJBRC sorted and the tripod set up.
     
  15. Yorkshiretea

    Yorkshiretea B Grade Bandit

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    First crack at it
     
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  16. poth

    poth Whafta old Gits world champion

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  17. poth

    poth Whafta old Gits world champion

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    Here's my lgu taken with a phone looks a bit manky on the photo but looks OK to the naked eye
     
  18. Waldo

    Waldo Active Member

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    A few pics taken of an EV2 crown and breech with a 3 volt white LED in the barrel about 4 inch's away from the microscope the led is too bright ( tried it with some correction fluid on the led lens but cant get it to cover the led evenly )so may try an opaque led to see if that improves the pics . Also a bit better with the microscope led's turned down or off.

    Tue Jan 16 18-50-37.jpg Tue Jan 16 18-49-52.jpg Tue Jan 16 18-47-11.jpg Tue Jan 16 18-43-48.jpg Tue Jan 16 18-37-59.jpg Tue Jan 16 18-14-00.jpg
     
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  19. NeilM

    NeilM Well-Known Member

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    Wow... The little bits of impacted lead don't surprise me, but the machining marks and damage are amazing to see.
     
  20. what barn door

    what barn door Now them tin chickens are going to get it....

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    yep agree totally with Neil, the gouging looks pretty bad, any ideas as to how that hapened? What equipment did you use to take the photos?
     

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