1. The Forum Rules have undergone some minor changes and updates.  Please take the time to read them; it will only take a couple of minutes of your time. By doing so, you lessen the chance of incurring the wrath of the moderation team or making yourself look foolish to other members.

    90% of users posting adverts in the Sales forums need to be reminded to read the rules as their posts are wrong.  This is unnecessarily time-consuming and will no longer happen - if your advert doesn't follow the Sales Rules it will be deleted and you'll have to start all over again.

    To close this box once you've read it (and the Rules), click on the X in the top right-hand corner.

    Thank you.

    AGF Staff



    Dismiss Notice
  2. A reminder of one of the Forum Rules:

    'Behaviour

    Do not make inappropriate or offensive posts - including threats, harassment, swearing, prejudice, defamation, deliberate insults or name-calling, other negative remarks about this forum, its moderators and administrators or your fellow members. Even if this is just your own personal opinion, RESPECT YOUR FELLOW MEMBERS.'

    There have been changes made to our censoring software in an attempt to help with this growing problem.

    Click the X in the top-right-hand corner to dismiss this notice.
    Dismiss Notice
  3. Dear members,

    Our membership (like our country) consists of people from all walks of life; different in far more ways than can be listed here and each with a different view based on their experience of life - regardless of their colour, religion or cultural heritage. Every single person in the UK has been born of mixed race – we are a multi-coloured and multi-cultural country.

    As many of you are aware there are a handful of individuals amongst this membership that persist in making provocative, inflammatory, racist and otherwise offensive comments. This has been happening across the forum to a certain degree but is most especially prevalent in the Adult section.

    The moderation team has tried to stay on top of this, however unfortunately because of the ‘offensive’ nature of much of its content we don’t monitor the Adult section quite as much as perhaps we should. As a result much of this behaviour has gone unnoticed unless it has been reported to us. While the team always intended to take a "light touch" approach to the Adult section it would seem that some people aren’t quite adult enough to be left unmonitored after all.

    This behaviour is, and always has been against Forum Rules as well as the specific stipulations of the Adults forum and it will no longer be tolerated. We feel it's time to draw a line in the sand and as such from this point onward offenders will receive an immediate and permanent ban from the forum.

    In order for us to achieve our goal of restoring the forum to the friendly and tolerant place it once was, we ask that ALL members be mindful of the content they post and help us to stop unacceptable behaviour by using the 'Report' tool at the bottom of any offending post - the results of which can be seen only by Admin/Moderators.

    You should all receive a copy of this message by PM. 

    To close this message box, click on the 'X' in the top-right-hand corner.

    Dismiss Notice
  4. Hotmail block emails from us entering your inbox. Unless you can setup a safe sender you will not get activation emails from the forum. Please use an alternative provider or complain to Hotmail.
    Hotmail addresses include.

    @Hotmail.co.uk @Hotmail.com @outlook.com @Live.com
    Dismiss Notice
  5. Postings on Politics, Religion & Controversial Off-Topic Material

    The majority of users do not want to read about these subjects and people have left the forum as a result of it – this is after all an 'Airgun' Forum. It’s all very well to say they don’t have to read it if they don't want to, but as most of us use the ‘New Posts’ button there is no easy way to avoid it.

    All AGF staff members are in favour of people being able to discuss what they want, but we have to draw the line somewhere if it is upsetting other users. We don’t want to read about these topics either.

    IMPORTANT- The discussion of politics and religion is no longer allowed anywhere on the forum (including the Adult section).  The only exception is if it's airgun related - they must be put in the Airgun Related Politics section..

    We will not tolerate bullying or personal attacks, racism or any other offensive 'isms'. we will remove these topics from the forum, we will not give you an area where you can abuse each other. We will not hesitate to ban offenders.

    To clear this text box, click on the 'X' in the top right-hand corner.

    Dismiss Notice

Brass scope mounts

Discussion in 'Anything Airgun Related' started by Amego, May 21, 2014.

  1. Amego

    Amego Active Member

    Messages:
    44
    Likes Received:
    0
    Location:
    Haverfordwest
    Hey guys my mate going to make me a set anyone else used brass mounts
    he's going to make stainless steel and aly ones
     
  2. JD

    JD Donator

    Messages:
    7,308
    Likes Received:
    1,033
    Location:
    Dorset
    I would be interested in some Bronze ones.

    Please post a pic up when they are finished being made.
     
  3. mattyts

    mattyts Donator

    Messages:
    6,201
    Likes Received:
    163
    Location:
    Yorkshire
    Why bronze?
     
  4. vitalich

    vitalich Keyboard Hero

    Messages:
    2,892
    Likes Received:
    1
    Location:
    london
    How much wil it cost to make two weaver sets in ss? 30mm med and 1" med?
     
  5. Amego

    Amego Active Member

    Messages:
    44
    Likes Received:
    0
    Location:
    Haverfordwest
    I'll ask him
     
  6. GIRLYPANTS

    GIRLYPANTS Banned

    Messages:
    2,077
    Likes Received:
    9
    Location:
    Havant.Hampshire
    thing that im thinking of is how the metal conducts heat .... put mounts on when warm and go out in the cold, or put mounts on when cold and then go out when hot, would that be enough to crimp the aluminium scope tube :confused: soo .... im thinking due to the difference in condution of heat (brass and aluminium) id say its best to have aluminium mounts on an aluminium scope also brass weighs alot more ...
     
    Last edited: May 21, 2014
  7. Amego

    Amego Active Member

    Messages:
    44
    Likes Received:
    0
    Location:
    Haverfordwest
    He's said that to me so I'm putting fine foam tape on the mounts
     
  8. vitalich

    vitalich Keyboard Hero

    Messages:
    2,892
    Likes Received:
    1
    Location:
    london
    Brass mounts should looks great on a gun with lots of polished brass parts
     
    Last edited: May 21, 2014
  9. Amego

    Amego Active Member

    Messages:
    44
    Likes Received:
    0
    Location:
    Haverfordwest
    I'll get some pics up soon
     
  10. stevemandm

    stevemandm Honorary Member

    Messages:
    8,272
    Likes Received:
    830
    Location:
    in a distant galaxy, far far away ....... actually
    good and valid points here by nathan. brass would look good and is heavier, but may affect the scope as it flex's/contracts/expands due to heat variation. also, when you clamp brass down, it wont return to its original state as freely as aly or stainless. wouldnt be my first choice of materiel for mounts - in fact, i would only have good grade aly or stainless - these are more stable on a molecular level.
    soz if this aint the answer that you were looking for
     
  11. vitalich

    vitalich Keyboard Hero

    Messages:
    2,892
    Likes Received:
    1
    Location:
    london
    B#!! $#!t
    Aluminium thermal expansion coefficient is 22.2*10-6
    Brass thermal expansion coefficient is 18.7*10-6
    Stainless is about 12*10-6 (depend of ss mark)

    Brass would not return back after tighted down, but it.s better as u have less chances to damage scope, and it.s not a problem if u use one set of mounts for one scope.
    If u switch the scope every week, better go for stainless, as aluminium wouldn.t hold screws for long.

    The same time I wouldn.t use brass mounts for full power springers as it too flexy, or u need a separate stop block
     
  12. stevemandm

    stevemandm Honorary Member

    Messages:
    8,272
    Likes Received:
    830
    Location:
    in a distant galaxy, far far away ....... actually
    your figures of coefficient expansion are correct, but only tell part of the story.
    the point i was trying to make was that brass is more unstable and unpure on a molecular level, compared to aluminium and stainless - thus ultimately affecting its effectiveness in certain applications and conditions.
    believe it or not, my apprenticeship, city & guilds, nvq levels 1-4, hnc and hnd in mechanical engineering and metallurgy do come in handy at times ....
     
  13. vitalich

    vitalich Keyboard Hero

    Messages:
    2,892
    Likes Received:
    1
    Location:
    london
    here i'm fully agree with you on brass specifics

    frankly speaking about brass mounts, all alu and ss benefits are correct if we talking about leupold, warne or other quality made stuff
    comparing to chinese (smk, nikko ond others) med and low quality stuff within standart airgun usage and keeping conditions (0 C to 30 C, or may be up to 40 c if left in the sun) no major difference even with expansion or whatever

    more than that, people are usually using tape or fine foam lyer to prevent the scope from scratches which fully eliminate any expansion difference

    for brass mounts i would better go for warne design, like this
    View attachment 96786
    neither than regular flat ones
    View attachment 96787
     
  14. oliver13

    oliver13 Donator

    Messages:
    1,149
    Likes Received:
    1
    Location:
    Lairg
    If I need to line a scope mount I use a couple of rectangles of this stuff: http://www.screwfix.com/p/self-amalgamating-rubber-tape-black-19mm-x-10m/87717

    It's more stable than foam tape & I don't think you will find a foam tape thin enough, it's handy if you need to put a vintage 3/4" tubed scope in modern 20mm mounts as well.
     
  15. JD

    JD Donator

    Messages:
    7,308
    Likes Received:
    1,033
    Location:
    Dorset
    what about Bronze, I would have thought it was very stable ?
     
  16. stevemandm

    stevemandm Honorary Member

    Messages:
    8,272
    Likes Received:
    830
    Location:
    in a distant galaxy, far far away ....... actually
    its quite stable, but at approx 85-90% copper, i would say its too malleable to be used as a scope mount
     
  17. jolo-bolo

    jolo-bolo Donator

    Messages:
    4,054
    Likes Received:
    13
    Location:
    Billericay
    I bet Droid would go for the brass ones for his gold finger specil.
     
  18. JD

    JD Donator

    Messages:
    7,308
    Likes Received:
    1,033
    Location:
    Dorset
    Gun metal is 10% tin 90% copper, Bronze is 30% tin 70% copper .

    I don't think either alloys would be malleable but a bitch to machine.
     
  19. 177

    177 Donator

    Messages:
    7,704
    Likes Received:
    576
    Location:
    Berwick upon Tweed
    Stuff the lot of you.

    I'm going to forge up a couple of Damascus billets and have my retired gunsmith mate machine a pair of mounts.

    With a well deserved entitlement to a "ner, ner na, ner ner", does anyone care to venture the coefficient and expansion/contraction rates of approximately 300 layers of forge welded, twisted and normalised L6 and O1 ?

    :)

    All I would add to this is that under normal working temperatures you could probably get away with lead scope mounts on a PCP.

    Very little clamping pressure is required.

    I'm not saying that we should, but you could.
     
  20. vitalich

    vitalich Keyboard Hero

    Messages:
    2,892
    Likes Received:
    1
    Location:
    london
    I will be first in line for damascus mounts if the price will be any affordable.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice