Commercially produced, stitching wire is not straight. Each spool size
has a desired curvature of the wire. The radial or circular curvature is known
as “Cast.” Cast is measured as the diameter of a free turn of wire. The axial
component is referred to as “Camber.” Camber is measured at the offset in the
ends of one turn of freely hanging wire. The larger the cast and the smaller
the camber are characteristics of a high quality wire. This allows the wire to
go into the stitching head smoother, producing less drag, and will provide fewer
dropped stitches. The stitching head will work more efficiently with less
energy and maintenance.
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