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Brass Liner Question

Discussion in 'Fit & Finish' started by mwilson, May 5, 2014.

  1. mwilson

    mwilson New Member

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    I have a couple questions about brass liners, I hope I'm using the right terms

    I'm thinking about epoxying a thin layer of brass to the inside of the micarta I plan to use for the friction folders I am making. I have read that it can be difficult to get the epoxy to hold, and pins are recommended. There will be pins of course, but any tips on how to get a good chemical bond?

    Also is there a standard thickness when using liners of any kind? or maybe brass in particular? I found some reasonable pricing on ebay but it seems very thin, and I don't want it to be a waste.

    Any thoughts or previous experience in this area would be much appreciated. I have not used liners in the past, and so of course, I have no frame of reference to draw from here.

    Thanks in advance everyone.

    Matt
     
  2. Mythtaken

    Mythtaken Staff Member CKM Staff

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    I use epoxy to attach brass liners to the scales, though I always pin as well -- I just feel better having both the chemical and mechanical bond. Just clean the surface of the brass really well, then scratch it up with coarse grit before you epoxy. I haven't had one come off yet. As for the thickness of the liners, that depends on their purpose, your design, and the material. Sometimes thin looks better, sometimes thick. Where the liner is a major structural component of the knife (e.g. a locking liner knife) you'll obviously need to use thicker or stiffer material.

    In a friction folder, often the scales provide the structural framework, so the liner is more of a design element. But if you add bolsters, or want to use use two colours of micarta in the scales, the liner becomes more important for strength.
     
  3. mwilson

    mwilson New Member

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    Thanks for the quick response.

    The intended purpose of the liners in this case is mostly aesthetics. the plan is a black and brass theme with one of the knives, and I can't see an extra mm making a big difference in strength.

    I have never worked with brass before, and saw on ebay everything from 0.05mm in thickness up to 5mm. with such a huge range, i thought i would pitch the questions out.

    I see some of the g10 and vulcanized fibers available out there are around the 0.3mm thickness. would you recommend thinner or thicker than that?

    Thanks again
     
  4. Brad

    Brad Active Member

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    The only thing I would add is drill lots of holes in the brass so the epoxy can bond to the G10. I like to drill holes through the tang as well, reduces weight and allows the epoxy to bond from scale to scale.
     
  5. Mythtaken

    Mythtaken Staff Member CKM Staff

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    Since the liners are going to be purely aesthetic, you can go as thin as you like. I've used .2mm behind micarta with no problem. You're going to have two or three pins in your friction folder anyway. Peening those in place will create enough mechanical bond to support the epoxy's hold.
     

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