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3 posters

    Alloy hardness and tempers for trigger mech

    B.Cheers
    B.Cheers
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 60
    Join date : 2012-10-08
    Age : 35
    Location : Austrailia Brisbane

    Alloy hardness and tempers for trigger mech Empty Alloy hardness and tempers for trigger mech

    Post by B.Cheers Thu Nov 29, 2012 7:12 pm

    Hey hows it going every one?
    Been getting stuff sorted for my next build and since i need it to be low weight im going with alloy, yet the company im going to get it from has a range of different alloys,tempers would these range from softest to hardest.
    And would this alloy cut it as (1) back bone for my crossbow and (2) a strong sear latch?

    Aluminium Plate
    Alloy 5005, 5052, 5083, 5186, 5454
    Temper H32, H34, H116, H321
    Thickness (mm) 4 to 25
    Width (mm) 1200 to 2500
    Length (mm) 2400 to 12000, Customer specific length
    Finish Mill, Customer specific finish,
    Coating PE Coating (not standard)
    Plasma profile To customer drawings
    avatar
    panne
    Fresh Blood

    Doesn't mean
    I'm new to crossbows


    Fresh Blood Doesn't meanI'm new to crossbows


    Posts : 46
    Join date : 2012-10-21
    Location : abbeville, la

    Alloy hardness and tempers for trigger mech Empty Re: Alloy hardness and tempers for trigger mech

    Post by panne Fri Nov 30, 2012 11:52 am

    if i'm understanding correctly backbone translates as tiller. if so definitely. as far as the sear latch goes it should be strong enough, but it will wear out rather quickly on the sections under a loaded friction. it will wear to a point that it will let go when it feels like it

    are you going to use the same style trigger as your bullpup? if so making the latch part out of steel will only add a few grams of weight and add a lot more safety and dependability. if you support it well on each side to eliminate side play you can use thinner steel to save a few grams.

    a thinner hook tip will wear faster and possibly not as smooth, but slow enough to be safe and functional. adjusting the pivot point can increase leverage enough to compensate for most of the smoothness loss and increased trigger weight.
    B.Cheers
    B.Cheers
    Tinkerer

    If there is a will, there is a way.


    TinkererIf there is a will, there  is a way.


    Posts : 60
    Join date : 2012-10-08
    Age : 35
    Location : Austrailia Brisbane

    Alloy hardness and tempers for trigger mech Empty Re: Alloy hardness and tempers for trigger mech

    Post by B.Cheers Sat Dec 01, 2012 11:05 pm

    @Panne
    Well yeah i was gonna design it the same as my bull-pup crossbow making the bolt rail,side plates and trigger mech as one part in which the rest of the crossbow is built off so this part is basically the tiller.

    As for the trigger i will be going for the same set up with out the roller nut and alot more lighter design and yeah i guess keeping the latch steel is the better way to go about it.

    And the hook tip on my latch is well pretty heavy duty prob a quarter inch of steel width with just under a half inch latch, pretty much the design was good just the wrong materials and too much of.
    avatar
    c sitas
    Crossbow Junkie

    I live here!


    Crossbow JunkieI live here!


    Posts : 547
    Join date : 2012-11-24

    Alloy hardness and tempers for trigger mech Empty Re: Alloy hardness and tempers for trigger mech

    Post by c sitas Mon Dec 17, 2012 9:31 pm

    Hello fellows; I use a tip given to me by an older than I fellow. I use aluminum a lot for the string catch .I carefully file the sear notch just a hair past 90 degrees, then I use JB Weld, long dry epxoy to glue on a hard face. I make this face out of a piece of a discarded hacksaw blade. I ruff up both surfaces to be glued with a dremel cutoff wheel . Scar them up good, making some teeth on the surface for the glue to hook into. I mentioned earlier that a use the longer drying stuff for glue. Once this has dryed at least over night I use a ceramic stone to ploish the sear.If you work carefully ,the sear will be as a piece of glass,and just as hard. I have lost a piece now and then but it doesn't create the end of the world . You just suddenly notice the trigger is harder to pull.I'm no expert here, and make no claims , I'm just saying.Have fun all.

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    Alloy hardness and tempers for trigger mech Empty Re: Alloy hardness and tempers for trigger mech

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