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Japanese Bullseye Link Sizes
Article © MAIL User: kerravonsen

Here is a tip for how to make Japanese Bullseye without having to have the exact same measurements (or Aspect Ratios) as the original example given in the weaves section.

This being a multi-wire-thickness weave, aspect ratio isn't that helpful.
With this weave, there are four sizes of link (it would be theoretically possible to reduce it to two, but I digress).

Image: MAIL_kerravonsen008.jpg

The stats for that particular segment of Japanese Bullseye are as follows:

The reason why this works? Because 4 + (2 * 4) = 12. To be precise, the inner diameter of link B, plus two times the inner diameter of link C, equals the outer diameter of link A. If B and C are too small, they won't go across the centre of link A. If B and C are too large, they will flop around rather than holding link B in the centre of link A.

The size of link D isn't so critical; it just needs to be sufficiently larger than links B and C that one can link the bullseye units together. It doesn't have to be smaller than link A, but I think it looks nicer if it is.

This is where one could reduce this to two sizes of link rather than four: make B and C the same size (as I did in this case) and make A and D the same size. Note that if B and C links are the same size, the formula alters to

3 * ID(link-B) = OD(link-A)
rather than
ID(link-B) + (2 * ID(link-C)) = OD(link-A)

In other words, B and C cannot be the same size unless the outer diameter of link-A is divisible by three.

Even with this formula, experimentation is still needed... and/or a good set of callipers. This is because relying on the "mandrel size" as an indication of the inner diameter of the links isn't good enough for this weave, because the size is so critical. One of my experiments involved a brass link that I thought had an inner diameter of 4mm and a wire diameter of 1.5mm, but it turned out to have a larger ID than that, and the rings ended up flopping around.

I hope at least some of you will find this article helpful in making Japanese Bullseye more easily.
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