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TIPS
About Wire Rope!
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Specification
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Diameter
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The
size of the pullyey, sheave or drum determines the maximum
diameter of the rope or cable that can be fed through
the transit or fitting. With control cables, diameter
usually refers to the overall, condult or outer casing
diamension. With bare wire rope, the largest outer diameter
is listed because the rope's diameter is not uniform
in size.
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Breaking
Strength
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Breaking
strength is the maximum tensile load or force that the
wire rope or mechanical cable will hold before breaking.
Breaking strength is multiplied by a safety factor to
determine the actual operating or working load of the
wire rope.
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Number
of Strands
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Suppliers
list the number of wires per strand followed by the
number of strands per rope or cable. For example, products
with a 7X19 designation have seven strands per cable
and 19 wires per strand. The core is not included in
the number of wires per strand. In cable-laid rope,
the number of cables is stated.
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Consideration
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When
selecting the appropriate wire rope cable for your wire
rope assamblies or control product, there are a few
factors which need to be considered!
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CONSTRUCTIONAL
STRETCH
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All
wire rope cables have spaces between each strand and
wire. When a load is applied, the spaces between the
wires are reduced and the wire rope cable will grow
in length. The amount of the growth is determined by
the load applied, length of the cable and construction
of the cable.
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ELASTIC
STRETCH
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An
elongation of the cable wires when a load is applied.
This can be a significant factor when the yeild point
of the wire is surpassed.
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MINIMAL
BREAKING STRENGTH
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The
minimum breaking strength is referred to as the minimum
tensile strength. This is measured in lbs. or kg. and
should be based on the max working load and safety factor.
The recommended minimum safety factor ration is 10:1
which represents(min. breaking strength TO max working
load).
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