AppendixD
INTERNALLY LUBRICATED Wire
rope or strand having all
of
its wire com-
ponents coated with lubricants.
IRON
ROPE
A grade
of
wire rope.
KINK
A unique deformation
of
a wire
rope caused by a loop
of
rope being
pulled down tight.
It
represents irrepara-
ble damage and an indeterminate loss
of
strength in the rope.
LAGGING
a)
External wood covering
on a reel to protect the wire rope or
strand, or b) the grooved shell
of
a drum.
LANG
LAY
ROPE
See LAY
,TYPES.
LAY a) The manner in which the wires
in a strand or the strands in a rope are
helically laid, or b) the distance mea-
sured parallel to the axis
of
the rope (or
strand) in which a strand (or wire) makes
one complete helical convolution about
the core (or center). In this connection,
lay is also
refened
to
as
LAY LENGTH
or
PITCH.
LAY,
TYPES
1) Right Lay: The direction
of
strand or
wire helix conesponding to that
of
a
right hand screw thread.
2) Left Lay: The direction
of
strand or
wire helix conesponding to that
of
a left
hand screw thread.
3)
Cross Lay: Rope
or
strand in which
one
or
more operations are performed in
opposite directions. A multiple operation
product is described according to the
direction
of
the outside layer.
4) Regular Lay: The type
of
rope where-
in the lay
of
the wires in the strand is in
the opposite direction
to
the lay
of
the
strand in the rope. The crowns
of
the
wires appear to be parallel to the axis
of
the rope.
5) Lang Lay: The type
of
rope in which
the lay
of
the wires in the strand is in the
same direction
as
the lay
of
the strand in
the rope. The crowns
of
the wires appear
to
be at an angle to the axis
of
the rope.
6) Alternate Lay: Lay
of
a wire rope in
which the strands are alternately regular
and lang lay.
7)
Reverse Lay: Another term for alter-
nate lay.
LAY
LENGTH See LAY (b).
LEAD LINE That part
of
a rope tackle
leading from the first,
or
fast, sheave to
the drum.
See DRUM and SHEAVE.
LEFT
LAY
See
LAY,
TYPES.
LOCKED
COIL
STRAND Smooth-
surfaced strand ordinarily constructed
of
shaped, outer wires ananged in concen-
tric layers around a center
of
round
wires.
MARLINE
SPIKE
Tapered steel pin
used as a tool for splicing wire rope.
MARTENSITE A nonductile
microstructure
of
steel formed when the
steel is heated above its critical tempera-
ture and rapidly quenched. This occurs
in wire rope
as
a result
of
frictional heat-
ing and the mass cooling effect
of
the
cold metal beneath. Martensite cracks
very easily, and such cracks can propa-
gate from the surface through the entire
wire.
MILKING The progressive movement
of
strands along the axis
of
the rope,
resulting from the rope's movement
through a restricted passage such as a
tight sheave.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
·137
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