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Author Topic: Induction Annealing???  (Read 5251 times)

Offline Bullet94

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Induction Annealing???
« on: 10:55 AM, 11/08/09 »
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  • A Word to the Wise is Sufficient.


    Offline Southern Marksman

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    Induction Annealing???
    « Reply #1 on: 02:21 PM, 11/08/09 »
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  • I put together a short video showing my setup and how I do it.

    http://www.youtube.com/watch?v=mbjhTXvwVPU
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    Offline gambleone

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    Induction Annealing???
    « Reply #2 on: 02:51 PM, 11/08/09 »
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  • That's quite a set up. Thanks Gearheadpyro, & for the Youtube video.  :)


    Offline mikecr

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    Induction Annealing???
    « Reply #3 on: 04:32 PM, 11/08/09 »
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  • A form of temperature control seems needed. That brass taken to chery red in the video is ruined.

    Offline Southern Marksman

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    Induction Annealing???
    « Reply #4 on: 04:42 PM, 11/08/09 »
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  • mikecr:
    I'm working on automating it to take my slightly inaccurate timing out of it. That one piece got a tad too hot, but no glaze formed and it is not supple in my hand, it does not appear destroyed. I will still load and shoot it.
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    Offline dantiff2

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    Induction Annealing???
    « Reply #5 on: 06:39 PM, 11/08/09 »
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  • Brass that has turned red is not ruined..  Mine turns red slightly and still shoots little groups and holds the bullet for a .020 jam in the lands.

    Dan


    Offline Southern Marksman

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    Induction Annealing???
    « Reply #6 on: 09:00 PM, 11/08/09 »
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  • I originally tried that, but it did not work as well as I had expected. I think it would work better if I got a longer wire for the U-Form Coil, and doubled layered the loops. The more loops in the coil you have the stronger the field is and therefore the greater capacity for heating.
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    Offline NorCalMikie

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    Induction Annealing???
    « Reply #7 on: 01:51 PM, 11/09/09 »
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  • What about the "water quench" after the brass is heated? I thought "that" was part of the process?
    OZ never gave nothing to the Tin Man, that he didn't already have.

    Offline Southern Marksman

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    Induction Annealing???
    « Reply #8 on: 02:30 PM, 11/09/09 »
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  • Brass is a unique metal in that rapid cooling is not needed for proper annealing.

    Neither the Ken Light automatic annealer nor the zephyr dynamics Brass-o-matic use a water quench, although the Ken Light machine i think (could be wrong on this) does use boiling water in the turntable as a heat sink.
    « Last Edit: 03:21 PM, 11/09/09 by Gearheadpyro »
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    Offline dantiff2

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    Induction Annealing???
    « Reply #9 on: 02:33 PM, 11/09/09 »
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  • Honestly there is NO benifit to water quenching brass. The neck/shoulder is the only thing to reach annealing temps and then starts the cooling process imediately after the heat source is removed. There is some heat transfered to the case body/head, but it is not nearly hot enough to do anything "bad".  Quenching is used in the hardening process of iron (steel)

    Offline Steve Blair

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    Induction Annealing???
    « Reply #10 on: 02:52 PM, 11/09/09 »
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  • Cartridge brass is a 70% Copper, 30% Zinc alloy that derives no benefit at all from quenching. Hardening can only occur by mechanical means and annealing can be accomplished by quickly heating to between 750 and 800 f and air and/or conduction cooling. Attached is a PDF with more information than you wanted to know about cartridge brass.

    This article by Jim Harris and Ken Light explains annealing generally and the BC 1000 specifically. I own one of these fine machines and use it every three firings on my brass.
    « Last Edit: 02:01 PM, 01/11/14 by Steve Blair »
    Sleepygator

    Offline jo191145

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    Induction Annealing???
    « Reply #11 on: 03:00 PM, 11/09/09 »
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  • There is no need to quench brass while annealing IF you do it properly. Quenching merely helps rapidly cool the brass to prevent heat convecting down the body. Its not a bad thing to do but not entirely necessary.
    In longish cases like 308, 204R etc I do not quench entirely. I place a folded towel inside a bucket and add water until its just below the surface of the towel. Using a drill and deep dish socket (heat sink)of the appropriate size I spin the case for the alotted amount of time. Varies by neck thickness and circumference and of course flame temp. Then just dump onto the saturated towel.
    Gives a cooling effect without total immersion and the need to dry.

    I've done the long cases entirely dry but I like the half wet method just for peace of mind.

    Short cases like 6ppc and 6BR I still quench fully. We run those little things at some mighty high pressures and I'd rather deal with drying than dying ;)
    Powder charges by Creighton Audette. Seating depths by Virgil King. Attitude by Ayn Rand =)

    Offline Southern Marksman

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    Induction Annealing???
    « Reply #12 on: 03:34 PM, 11/09/09 »
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  • That's an excellent article on annealing sleepygator. Thanks.
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    Offline Rust

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    Induction Annealing???
    « Reply #13 on: 02:55 PM, 11/11/09 »
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  • Couple of questions:

    What is the power requirement for the inductor, 155 V? 15 amps outlet or 20 amp outlet?

    What does the inductor cost?

    Offline Southern Marksman

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    Induction Annealing???
    « Reply #14 on: 05:32 PM, 11/11/09 »
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  • 120v, I plug it straight into a normal wall socket without any issues.

    I picked it up on tooltopia for $370
    www.southernmarksman.com
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