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How to Make Your Own Distance Computer
Step 1: Download and print out the image file.
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The image file will look like the picture to the right.
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Each sheet will produce two computers.
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A laser printer is best; most inkjet ink will run if it gets wet.
If you have an inkjet printer, you can reproduce the image with a photocopier.
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The computer is also sturdier if it is printed onto card stock, like
that used for index cards. An office supply store or photocopier
center can help you find this.
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The image file is available in four different formats. The original
file was created in Adobe PostScript®, so it will have the highest
quality, and Adobe Acrobat® is equally good. If you do not have
the software necessary to handle these, there are also GIF and Microsoft
Word® files.
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Image files:
Step 2: Cut out the circular patterns.
Step 3: CAREFULLY punch holes in the center of each circle (marked by the
cross).
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Each hole should be about 1/8 inch (3 mm) in diameter.
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A pencil works well for punching the holes.
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To be completely safe, it would be best to use a block of wood, with a
3/16 inch hole drilled into it, as a backing piece. Place the card
on the block, center it over the hole, and punch.
Step 4: Fasten the two circles together with a paper brad.
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These are still available at office supply stores.
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The ones I found are labeled "Brass Plated Fasteners."
The inner circle should turn freely and be centered within the outer circle.
Your computer should look something like this:
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