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Hand Splice |
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Thimble
Eye
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Ferrule Secured Soft
Eye |
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Wire Rope Slings are most
commonly measured from the Bearing points
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Slings
can also be measured from
the
centres
i.e. for use with Pin or Bolt.
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EFFECTIVE
WORKING LENGTH
(EWL)
Bearing
Points Including
Fittings
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LOOP
SIZES |
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Supplied
with Natural Loops
or
you can Specify loop sizes to suit own requirements |
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T-end
and ball end fittings |
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Bright
zinc plated T-end
steel
ball |
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Ferrule Secured End
Stops |
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ALUMINIUM
& COPPER
Can be measured overall length or
to inside of endstop |
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coated
wires |
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Coloured
or Clear
swaged
over PVC / nylon
or
stripped
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Screw
together Loops |
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Bright
Zinc Plated
&
Knurled
End
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Grommets or Endless
Slings
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These
can be ferrule secured or hand spliced |
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Hand Spliced endless slings
These
are
very time consuming
to
make, so can be expensive
compared
to ferrule secured.
ferrule secured endless sling |
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Wire Rope consists of three
basic components, |
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1.
WIRES THAT FORM THE STRAND
2.
MULTI-WIRE STRANDS: LAID HELICALLY AROUND
A CORE
3.
THE CORE |
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Wire
for rope is made in
several materials, and types, these include steel and stainless steel, with wire
or fibre cores.
This is available in a
variety of grades of steel, stainless steel and galvanised.
Stainless steel ropes types
304 and 316 quality.
To
check out the Breaking Loads and Safe Working Loads
on
ropes,
go
to breaking load tables
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The
Assembly Process
All
wires in the assembly process are assembled with the aid of jigs, so the fitting of ferrules,
thimbles, soft eyes, end stops, etc always remain in the correct position before
pressing. This shows in the high accuracy rate of our assemblies in small or
large batch orders.
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The
Pressing, Swaging Process
There
is a whole range of fittings available which can be pressed onto the rope, the
most common being ferrules secured terminations, these can be aluminium, copper
or stainless steel. High grade aluminium alloy ferrules are used with galvanised
ropes and copper alloy ferrules are used with stainless steel. The ferrules are
non-corrosive special alloy with tremendous strength quality's. Ferrules are
passed over two parts of the rope to be joined and then pressed under high
pressure in dies, the metal then flows into the spaces between the individual
wires of the rope. The dies shape the ferrule to the correct diameter and
length, these are then randomly checked for dimensional correctness.
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Cleaning
Process
All
finished assemblies are then cleaned of all flashing and burrs produced by the
pressing / swaging process, this is so the ferrule has an even and smooth
surface finish. Before dispatch.
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Cutting
Process
Mainco
make sure all ends are cut neat and clean,
with
no burrs or deformed wires.
The
wire lengths are cut with consistent accuracy,
which
proves time saving in the assembly process
ensuring
the finished item is well within tolerance.
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MEASURING ROPE DIAMETER.
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at Mainco we pride ourselves on quality right from the start of your job, each
batch of wire is checked that preforming is correct, no loose strands or
broken wires, gaps between the strands. The diameter is within tolerance, and
the cut ends stay neatly together. |
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WIRE ROPE CORES
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THE CORE |
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The core forms the heart of
the rope and is the component about which the main rope strands are laid. (The
core supports the strands)
The core may take one of
several forms depending on the conditions under which the rope will be used.
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FIBRE CORE
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FIBRE CORE.
Adequate
for many types of service providing maximum flexibility and elasticity to the
wire rope. made of hard fibres, usually sisal or manila, most often used today
is polypropylene.
These latter cores are
useful where conditions surrounding rope use could result in premature failure
of natural fibre cores. Sisal and manila fibre cores are impregnated during the
cordage process with a suitable lubricant having preservative properties.
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INDEPENDENT WIRE ROPE CORE
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INDEPENDENT WIRE ROPE CORE. Consists
of a 6 x 7 strand steel wire rope
with a 7 wire centre strand. This core finds greatest use where ropes are
subjected to severe pressure while running over sheaves or winding onto drums.
This type of core should be used when a rope operates in temperatures damaging
to natural or man-made fibres. It provides additional strength and less
stretch.
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STEEL STRAND CORE
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STRAND
CORE.
Consists of a
strand of steel wires, nominally 7, 19 or 37 in numbers. It is used occasionally
in running rope of smaller diameters rather than IWRC. It may also be used in
stranding ropes, guys, suspender ropes, etc. Where extra strength, reduced
stretch and maximum resistance to weathering are required.
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manufactured to
the forma
B.S. 1290: 1983
now
to the new standards: bs. 302.pt2: en 12385. bs en13414-1
B.S.
302: Part 1 1987
B.S.
302: Part 2 1987
all
corresponding Test
certificates supplied
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.