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Thread: Scratchbuilt 1/8 scale M915A1

  1. #21
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    A few pictures of the grille that I built last winter. Now that I've figured out how to beat copper over a wood buck without a bunch of creases and warpage, I think the roof section will be pretty easy now.

    Grille1.jpgOverall shot

    grille2.jpgCloseup bottom right corner (bottom driver's side actually)

    grille3.jpgTop corner

    grille4.jpgOther bottom corner

    This was a pain to make. This was probably about the 20th try or so before I finally figured it out. But now I know What appears to be fairly large "dents"...i.e..the bottom along the middle...are actually very small imperfections. A good coat of primer will take care of all of them.

    Built the grille last winter...the radiator this winter....yeah...this shouldn't take much over a millennium to build. LOL.

    Mike
    Last edited by BrassBuilder; 01-08-2013 at 22:14.

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    USAFSS-ColdWarrior (01-08-2013)

  3. #22
    4 Star General 212sparky's Avatar
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    Default Re: Scratchbuilt 1/8 scale M915A1

    That is so freaking awesome!!!!!!!!!!
    Rob Edwards



    1971 M35A2C W/W
    1985 MEP-004a with M200a1

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    goldneagle (04-15-2013)

  5. #23
    2 Star General trukhead's Avatar
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    Quote Originally Posted by BrassBuilder View Post

    And that, my friends, is my big issue right now. It is harder to do than it appears since I have parts so close together. Compound that with the fact there are 42 "tubes" and around 100 fins (or so), I am looking at approximately 4200 individual solder joints.

    Mike
    HOw about fluxing and tinning the tubes, then fluxing the fins, then assembling the radiator and then baking it to flow the tinned tubes to the fins.
    The brain slowed the rate of spinning long enough for this idea to pop out......

  6. #24
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    Quote Originally Posted by trukhead View Post
    HOw about fluxing and tinning the tubes, then fluxing the fins, then assembling the radiator and then baking it to flow the tinned tubes to the fins.
    The brain slowed the rate of spinning long enough for this idea to pop out......
    That is a little different idea than what I tried. I tinned the tubes (actually .016" x 1/4" flat brass), slipped a few fins on, fluxed everything and then used a small butane torch to heat it up. It didn't work as good as I thought. I like your idea, but my problem is to keep 100 or so flimsy .002" thick shim stock straight with a uniform .025" spacing between rows. That is a big problem. I'm thinking of some sort of a frame or jig I could build.

    Thanks for the idea though. It gives me something to think about.

    There is a radiator manufacturer in town that specializes in aluminum radiators. I was thinking about talking to them about this.

    Mike

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    2 Star General trukhead's Avatar
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    How about assembling tinned tubes and fins as described before and sandwich .025 shim stock between each fin and the next fin across the width of the radiator and tighten the stack of shim stock and then connect the stack to one side of a resistance soldering outfit and hook the tubes to the other side of the resistance soldering unit and give it a zap.

    Ooh da brain hurts now!

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    BrassBuilder (01-14-2013)

  9. #26
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    Quote Originally Posted by trukhead View Post
    How about assembling tinned tubes and fins as described before and sandwich .025 shim stock between each fin and the next fin across the width of the radiator and tighten the stack of shim stock and then connect the stack to one side of a resistance soldering outfit and hook the tubes to the other side of the resistance soldering unit and give it a zap.

    Ooh da brain hurts now!
    Hmmmmmm....that is an idea. I've been using .025" aluminum shim stock for a spacer when I was experimenting soldering these individually. Actually, I could probably do something like this, but toss the whole works in an oven and let it bake.

    I'll have to contemplate this....while I make another 100 or so more fins.

    Thanks

    Mike

  10. #27
    Driver for the Ga Mafia EMD567's Avatar
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    Very Impressive........
    I saw the Alligator at Haspin '14
    They Call Me Porta John
    minivan driver for Spermsteam McMurphy and Spatz

    John Parker, in Aiken SC

    M814 WO/W " Long Easy"
    M37 "Bug Eyes"
    M105 with S250 shelter "Hooch"
    2006 Pontiac GTO Dead on Arrival
    1996 3/4 ton Chevy extended cab, long bed PU
    I THOUGHT I HAD MADE A MISTAKE, BUT I WAS WRONG

  11. #28
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    Here is an update of where I am at on the build. I started rebuilding the radiator a few months ago. After shelling out a few hundred for a stereo 3x-90x power microscope, I can finally see what I am soldering. This is going pretty good now. The pictures shows how much closer the fins will be. I am getting almost double in there from what I had before. The space is a lot closer to where I want it too. Hoping to get all the fins soldered and the top and header plates in before I leave for Afghanistan.

    Radiator_comp_01.jpg Radiator_comp_02.jpg

    The first few fins took me almost an hour each to get soldered in. I'm getting down to 5-10 minutes now. There are 41 individual solder joints. I found controlling the flux to bare minimum helps too. I'm guessing I will have about 150 fins in this. The other one has around 75. So....150 times 41 is a lot of solder joints! (6150 to be exact). I got my work cut out for me.

    Mike

  12. #29
    2 Star General trukhead's Avatar
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    Your posts and project are always fun to see!
    Fiber in a diet is a good thing!

  13. #30
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    Grrrr.....ran out of fins. Need to stop and make about 50 more. I'll probably go ahead and make the side rails while I'm at it. I want to try to etch them instead of cutting them out of the sheeting.

    radiator1.jpg

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