R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 96)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
96/130
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
Rotation Resistant Ropes
Maximum wire breaks Rope diam.
Mm
Rope
construction
Detected length mm
Duty class M4 Duty class M5, M6
40 2 4
6.7 17 x 7
200 4 8
50 2 4
8 – 8.5 24 x 7
250 4 8
70 2 4
11 – 11.5 28x 7
350 4 8
90 2 4
15 28 x7
450 4 8
Local reduction of rope diameter
Rope diameter can decrease due to external or internal wear or damage. When the actual diameter of a
standard or heavy duty rope has decreased 7 % of the nominal diameter the rope shall be changed. In
rotation resistant ropes the decrease by 3% cause rope discard.
Local increase of rope diameter
Deformations inside the rope can cause increase of rope diameter. If the actual rope diameter is
increased by 5%, the rope shall be changed.
Basket (birdcage) deformation
Basket deformation is a result of a difference in length between the rope core and outer strands. Rope
with basket deformation shall be changed immediately.