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to Technical Information Main Page |
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Cut
and Slip Procedure
On multiple layer drums, wire rope will wear out at the
crossover points from one wrap to the next. At these crossover points, the
rope is subjected to severe abrasion and crushing as it is pushed over the
rope 'grooves' and rides across the crown of the layer beneath. The scrubbing
of the rope, as this is happening, can easily be heard.
In order to extend the rope's working life, shortening of the rope at the
drum anchoring point of approx. 1/3 of the drum circumference, moves the
crossover point to a different section of the rope. Now, a rope section
previously not subjected to scrubbing and crushing will take the workload.
Lubrication
During fabrication, ropes are lubricated; the kind and amount depending
on the rope's size, type and use, if known. This in-process treatment will
provide the finished rope with ample protection for a reasonable time if
it is stored under proper conditions, and in the early stages of the rope's
working life. It must be supplemented, however, at regular intervals.
Re-lubrication of a wire rope is not always a simple task. Apart from lubricant
being a messy matter in itself, old lubricant, dirt and other particles
may cover the outside of a rope to a point were any newly applied lubricant
will not be allowed to penetrate the inside of a rope. In these cases it
becomes necessary to either thoroughly clean the rope, or to use a high
pressure lubrication device which forces new lubricant into the rope.
If the wire rope surface is clean, re-lubrication can also be made with
spray cans of specially formulated lubricant which penetrates the inside
of a rope.
The re-lubrication procedure and program is very much dependent on the length
and size of a rope and on the equipment the rope is installed on. In any
case, if a planned program of regular lubrication is not carried out, the
rope will deteriorate more rapidly.
Remember that tests have shown that non-lubricated
ropes will generate only about 1/3 of the bending cycles than ropes which
are well lubicated. Python® ropes with a plastic coated core have the
advantage that the inner rope is 'permanently lubricated'; the lubrication
is 'sealed in'. |
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