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www.TK560.com Vacuum Forming, Movie Prop, Sci-fi and GIjOE Forum
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Mattax Expert
Joined: 09 Mar 2006 Posts: 160 Location: Virginia
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Posted: Fri Oct 06, 2006 2:45 pm Post subject: |
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Too late, I already have the Stainless steel box made and on hand. I prefer not to drill holes into the top of the oven except for passing the two electrical wires and possibly the over temp sensor and temp sensor.
So, let me know what you mean by running
Quote: | some kind of coarse wire grid across the inside of the top of the oven. You could cut pieces of wire loose where you need to, and bend them up (down) to make supports that go around donuts. If you're not drilling any holes at all, you'd also need some stiffening across the middle and supports around the edges, to keep it up at the top |
Thanks. _________________ Mattax
TK487
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drcrash Guru
Joined: 04 Sep 2006 Posts: 705 Location: Austin, Texas
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Posted: Fri Oct 06, 2006 5:16 pm Post subject: |
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Quote: | So, let me know what you mean by running
Quote: |
some kind of coarse wire grid across the inside of the top of the oven. You could cut pieces of wire loose where you need to, and bend them up (down) to make supports that go around donuts. If you're not drilling any holes at all, you'd also need some stiffening across the middle and supports around the edges, to keep it up at the top |
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First, the simple version where you drill more holes in the top of the oven.
You get some piece of coarse metal grid the size of the outer coil path or a little bit bigger. You'll be bolting that to the ceiling after you attach the coils to it.
Ideally this would be a grid with about 1 or 2" squares, and fairly heavy duty wire that's not so heavy-duty that you can't nip it with nippers and bend it the way you want with pliers. (The stuff they make cheap wire mesh stacking cube panels out of seems about right, if you can get the epoxy coating off...)
Suppose you want to put a donut support in the middle of this hunk of 2" grid, and you need less than 4" of wire
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+---+---+---+---+
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+---+---+---+---+
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+---+---+---+---+
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+---+---+---+---+
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+---+---+---+---+
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you can take an 4-inch piece of wire sticking one direction from the middle point (I'll pick upward) and free it from the other wires by nipping it to the right length and nipping the wires that cross it where they cross it:
Code: | +---+-------+---+
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+---+-- | --+---+
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+---+---+---+---+
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+---+---+---+---+
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+---+---+---+---+ |
Now you bend the wire mesh 90 degrees at the point where it's still attached, to make it stick out at right angles from the plane of the mesh, (In this picture, toward the viewer.) You wrap the end of that wire around a donut, leaving the rest as a support.
Then you get something that looks like this:
Code: | +---+-------+---+
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+---+-- --+---+
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+---+---o---+---+
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+---+---+---+---+
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+---+---+---+---+ |
The o there is supposed to be the donut, sticking toward the viewer.
The big trick here is finding an appropriate mesh, with big enough boxes that you don't have to do a lot of nipping to free the right-sized piece of wire to make a support, and medium-sized wire that's easy to cut and bend without making the mesh too floppy.
Now you could bolt this to an oven, if you didn't mind drilling holes in it. If the mesh is kinda floppy, you could use strips of aluminum (maybe window screen frame stuff), and sandwich the mesh between that and the oven wall, bolting the strip to the oven floor/ceiling in a few places through the mesh holes.
(For example, you might use three or four strips like that, spaced about every 8 inches across the oven, between coil rows, and bolted every 10 inches.
To avoid drilling holes in the oven ceiling, you'd need to use support struts that could hold it reasonably flat across the width of the oven, and you'd have to support those with vertical struts around the edges. |
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drcrash Guru
Joined: 04 Sep 2006 Posts: 705 Location: Austin, Texas
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Posted: Fri Oct 06, 2006 5:23 pm Post subject: |
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Another way to make the grid more rigid, in one dimension, is to bend ridges into it every few inches. (Raising a wire a grid square height above the plane of the grid, and bringing the two adjacent wires together.
Then you'd probably only need a very few struts the other direction to support it. |
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