Half Persian 3-in-1, AR 6.35
1/2" @ 2.0mm, 3/8" @ 1.5mm, 1/4" @ 1.0mm
Categories: Instruction and information; Jewelry
Word count/read time: 559 words; 2-1/2 minutes
A comprehensive aspect ratio chart can be
found here.
OK, not the most original topic but at least this one is useful.
Well, maybe not that useful either because it's been covered before. Hundreds
of times. This is my way to add to the cyber babble.
Aspect ratio is the inner diameter of the ring divided by the wire diameter.
It is meaningful and completely useless simultaneously.
Without additional information, i.e. the ring size or the wire diameter,
it is a number of unknown importance.
That's why the same weave of a given AR can be different sizes.
For example, all of the following have a 6.35 AR:
- 1/2" I.D. @ 2.0mm wire: 1/2" is 12.7mm, so 12.7 / 2.0 = 6.35
- 3/8" I.D. @ 1.5mm wire: 3/8" is 12.7mm, so 9.525 / 1.5 = 6.35
- 1/4" I.D. @ 1.0mm wire: 1/4" is 6.35mm, so 6.35 / 1.0 = 6.35
What's AR's purpose? To someone unfamiliar with chain link designs, it's
about as relevant as discussing quantum physics with a praying mantis. To maillers, it tells
how the weave will look and behave.
The wire and dowel must be round for these calculations to work.
While there may be conversion charts for square-profile jump rings,
I have not seen one. Depending on the weave, the flat edges
of square wire can cause the rings to behave strangely.
AR-sensitive weaves can be categorized several ways.
One group is totally dependent on a strict AR or it will not only hold its shape
and possibly undo (rings won't fall out but it's called an unstable weave). That pigeonholes
the size choices. Definitely not much room for experimenting.
The second group looks best near a certain number but it will always remain stable.
In general, a lower aspect ratio produces a tighter, denser, and stronger weave.
Go low enough and it will bind upon itself before becoming unweavable as there won't
be enough space for additional rings. Barring AR-sensitive weaves, there is no
upper limit though spindly chains are not appealing.
The effects of AR show up under certain situations. All weaves have a 3-D structure.
This will be displayed most prominently when they hang.
In a wide-ranging AR size run of the same weave, a few will collapse when laid down, indicating the AR
is a bit high. Sometimes it looks OK but this should be known ahead of time to avoid surprises.
Even if you don't know much about chainmail, when someone mentions
AR the next question should be, "What size
are the rings?" The conversation should flow naturally at that point. End it before they
figure out you only know three things about maille: AR, wire diameter, and ring size, lol.
A current loop-in-loop project of mine uses AR 36 and makes a weave so tight the
entire 6" section can stand vertically. Another test piece used AR 44
for a thicker, equally as tight, still crazier yet, loop-in-loop.
It'd be interesting to see a Jens Pind Linkage JPL99. Using 3mm wire, the estimated 98-ish
AR jump rings would be just under 12" diameter. Figure 600 links.
That means nearly 2000ft of wire, which is 90 regular pounds (1313ozt) of
0.999 fine silver or 170 of 24k gold, standing as tall as a person.
That would make one helluva necklace that even Mr. T couldn't wear!
Posted by M: August 23, 2019
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