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Thread: Lost wax casting?

  1. #31
    Gunco Regular allesennogwat's Avatar
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    The dies can be pretty pricey. A cast steel AR lower should be plenty strong though.

  2. #32
    GuncoHolic zteknik's Avatar
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    the common thing i see at work with some of the castings at work is shrinkage
    some of it isnt too bad still usable-we usualy fill with weld and another one is gas porosity sorta like swiss cheese which renders it useless
    we do quite a number of recievers and we xray them all due to the pressures they will recieve penetrant dye and magnetic particle testing-magnaflux basicly-wont catch some of the internal imperfections that can render it non usable
    for the most part we dont have a lot of failures but on occasions we have a few
    once you have the process down its usualy consistant
    id say out of a 300 we might have one or 2 criticals

  3. #33
    Gunco Member jrenyard's Avatar
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    An excellent book is "Lost Wax Investment Casting" by C. W. Ammen.

  4. #34
    GuncoHolic zteknik's Avatar
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    Quote Originally Posted by jrenyard View Post
    An excellent book is "Lost Wax Investment Casting" by C. W. Ammen.
    cool!
    i have to check that one out

  5. #35
    Gunco Member jrenyard's Avatar
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    A good cast aluminum AR lower should be strong enough.
    Also look into lost foam casting.

  6. #36
    gunco irregular moleman's Avatar
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    I lucked out (I hope) and found a ceramic kiln that was local and cheap. Its a 110/220 volt paragon kiln thats rated to 2300 degrees. I need to get a plug for it as they were running it off of a 110 line and I'm gonna run it off of 220. I went ahead and bought it even though I've welded up a body for a propane fired one and just need to weld in a tube for the burner, cut a vent hole in the top, and put in the refractory. I figured the electric one would be easier to control for heat treating steel especially with an electronic controller, and I'd have something to do the lost wax molds in.

  7. #37
    Gunco Regular Rocster's Avatar
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    This is a great site, with tons of details and pics on lost foam casting of aluminum. The parts he made are nearly as complex as your basic 80% AR receiver. I think you could do something similar if you have the patience and skills to make the foam blank with a cnc hot wire cutter(less expensive than a real CNC mill by far).

    The first link just shows the final/perfected process and results:
    LFMC

    The below link has more pages and details of his previous attempts and failures, which are very informative:

    Home-brewed linear bearings

  8. #38
    gunco irregular moleman's Avatar
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    Thanks for the links, I've seen them before. I got the idea for using the propane tank from the bearings one, and the idea of using a pressure tool from the foam one to reduce shrinkage. Even if I'm unable to cast a good ar lower I figure I'll have fun making other things.

  9. #39
    Gunco Member JimM44's Avatar
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    So why doesn't somebody go into the wax model selling business?

    If you made good molds and then molded an 80% or less lower in wax, you could sell them cheap and ship to folks who want to try and make their own metal ones.

    In wax you wouldn't need anykind of approval to sell them and if you had good molds I think you sell a ton of them.

    Then folks could engrave and drill the wax models prior to encasing them and melting out the wax.

    You might have to make wooden magwell plugs to both cast and ship them but you could offer discounts on follow up orders for the folks who returned good wagwell plugs.
    "I don't like repeat offenders, I like DEAD offenders" Ted Nugent

  10. #40
    gunco irregular moleman's Avatar
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    Thats an interesting idea. You'd probably want to get an atf letter though to cya.

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