pugdog
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Nov 22, 2003, 4:52 PM
Post #2 of 2
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Hi,
Very nice :) (for those who don't have that issue, I've attached a scan. I'm sure FMG won't object to the plug.)
But (and there is always a but <G>), bead embroidery is a bit different than stringing or looming.
The bead has a thread through it, and either directly, or indirectly, pulled through a fabric or base. This puts a singular tension on the edges of the bead and thread (cutting/abrasion) type of mechanical stress. The tighter the pull, the stronger the stress, the more slack, the less the stress will be (but then there is a rising "abrasion" factor from the bead moving over the fiber). This is a _bad_ type of stress, because the cutting action of the edges of the beads is greatly enhanced. Weavers and loomers have this problem as well, especially at the ends of rows. Flexible belts or bands of beads, (watch bands, bracelets, etc) are subject to it at the row junctures and end of rows. Necklaces have less of it due to the more graceful curvatures.
With stringing, you have a different kind of stress. You don't have as much edge/cutting or abrasion on the edges, you have a sliding (minimal or great) effect, more of an abrasion than a cutting, _and_ you have a stress from the weight of the beads. This is the "test" or "Tensile Strength" of the fiber.
Here is a nice summary of the types of stress & strain http://physics.tamuk.edu/...tml/1401/stress.html
None of the above is "scientific data", just observational (although that is the basis of science -- observe, hypothesize, test [repeat steps 1-3 as often as needed] and report).
I've been trying to get some "scientific" data -- even if it's based on originally anecdotal events -- about these fibers. I've spent about 4-5 months so far trying to dig up, and to come up with from use, some sort of guides. But, the TeSt doesn't always match the durability for beading, and "abrasion resistance" can be dropped to 0 with some glass or crystal beads.
Random snapping is the primary concern of most people. That may just be innate, and unavoidable.
People do have preferences, though. The fused/flat lines, the braided round lines, the mono filaments (there is even some gold/yellow mono now that works with gold and citrine :), all have their pros, cons, and characteristics.
PUGDOG's Rock & Bead Shop
Pittsburgh, PA 15217
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