Pfeifer Messschieber 40 Manual page 14

Table of contents
1. Key .....................................................................
2. Intended use .......................................................
3. Legal and normative principles and
regulations .........................................................
4. Safety instructions .............................................
5. Description of operation .....................................
6. Description of the device/ technical data ............
7. Transport ............................................................
8. Recurring inspections ........................................
9. Measuring prerequisites ....................................
10. Measuring method .............................................
11. Application notes ................................................
12. Inspection and maintenance instructions .......... 10
13. Procedure in case of malfunctions .................... 11
14. Disposal ............................................................. 11
PFEIFER rope calliper gauge 01/2022 / Subject to change!
2
Preface
3 Why do you need to check the rope diameter?
Ropes are produced with a tolerance in the nominal
3
diameter. For example, the actual diameter of a new
rope with a nominal diameter of 20 mm at a diameter
3
tolerance from +0 % to +5 % can vary between
20.0 mm and 21.0 mm.
4
As early as the incoming goods inspection and at the
4
latest when placing a new rope in the respective instal-
4
lation, it is essential to determine the nominal rope
diameter (using the measured actual rope diameter).
6
Besides the type and direction of lay, with restrictions
6
also the rope construction, the rope diameter is one of
6 the few properties that can be checked without much
effort. If a rope with the wrong diameter is laid due to
7
confusion or incorrect or missing labelling, this can
8
have fatal consequences.
Furthermore, key properties for the operation of the
rope in the installation depend on the correct diameter.
Particularly for the multi-layer winding of rope drums,
complying with a narrow tolerance is essential for the
proper function.
The actual diameter of a steel wire rope changes during
operation due to wear, settling processes and other
external influences. Measuring the diameter can there-
fore provide information about the rope's state of wear.
The decrease in diameter, the so-called uniform dia-
meter reduction, is therefore an important criterion for
the discarding time a steel wire rope. To determine this
uniform diameter reduction numerically, a correct way
of measuring is fundamentally important.
This operating manual follows the specifications of the
relevant series of standards EN 12385/ISO 4309 and
also gives recommendations for practical use.