Theatre Design & Technology - Spring 2011 - 71
Quick &
Easy
Wire roPe
TerMiNATioNS
hArdWAre ANd TooLS NoT Needed
By deLBerT L. hALL ANd STeveN SANToS
iber rope is often preferred over wire rope for tasks that involve any type of "line," even though
wire rope is usually much stronger and less stretchy than most fiber ropes. Why? Because tying a knot in a
piece of rope is free, quick, and easy, and terminating wire rope is usually none of these. Making terminations
in wire rope requires the use of special hardware, such as cable clips or swaging sleeves, and tools, such as
nut drivers, socket wrenches, an expensive swaging tool, or a torque wrench. This article will demonstrate
what many people consider unthinkable: tying knots and making quick splices in wire rope.
hiSTory
reGULATioNS
William Albert, an official the Harz Mountain silver mines in Germany,
devised the first operative wire ropes around 1834. They were used in the
long vertical mine shafts as hoisting cables until 1854. These early wire
ropes were made using a process not unlike prehistoric techniques for
making hemp rope. Workers took three equal lengths of wrought-iron
wire and twisted them around each other by hand to make strands. Three
or four of these strands were then twisted together to make a rope.
Since the earliest days of wire rope, people have explored and
experimented with the use of knots in wire rope. Many of those early
experiments, and even most modern studies, have shown that most knots
tied in wire rope do not hold well because the wire rope is too stiff and
slick. But this is not true for all knots, and this article will show some of
the knots that do work-that are strong and will not slip.
There are a number of regulations relating to the use of knots and splices
in wire rope. Tying knots in wire rope is not an acceptable practice in all
fields or for all uses. Indeed, the practice is banned in several areas. For
instance:
* OSHA does not allow knots to be tied in wire rope in marine uses.
* OSHA all but outlaws wire rope knots in construction. Safety and
Health Regulations for Construction (Rigging equipment for
material handling), 29 CFR 1926.251(b)(5), states, "Wire
rope shall not be secured by knots, except on haul back lines on
scrapers." (Haul back lines are cables used to move other cables
and do not hold a live load.)
* The FAA bans the use of knots in wire rope used on aircraft (43.131b/2b).
spring 2011
theatre design
& technology
69
Table of Contents for the Digital Edition of Theatre Design & Technology - Spring 2011
Contents
Theatre Design & Technology - Spring 2011 - 1
Theatre Design & Technology - Spring 2011 - 2
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Theatre Design & Technology - Spring 2011 - Contents
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