Carl Stahl TECHNOCABLES

Pulleys

If wire ropes are guided via pulleys, the service life can be optimized by selecting the right deflection pulley and the appropriate rope construction. Wire ropes made of tungsten can be used to achieve a smaller guide pulley in the application or a longer service life with the same pulley size.

These factors can have a positive or negative effect on the service life of the rope used:

The ratio between groove diameter and rope diameter should be chosen according to the rope construction:

Choice of the right pulley

Wire rope diameterBearing levelRecommended pulley type
highmediumlow
up to 3 mmX  SP pulley with closed ball bearing [Details]SP pulley with closed ball bearing
up to 3 mmX  UP pulley with ball bearing [Details]UP pulley with ball bearing
up to 3 mm X MP pulley with plain bearing [Details]MP pulley with plain bearing
up to 3 mm  XBP pulley without bearing [Details]BP pulley without bearing
up to 8 mmX  LP pulley with needle bearing [Details]LP pulley with needle bearing
up to 8 mm X LP pulley with plain bearing [Details]LP pulley with plain bearing
up to 8 mm  XLP pulley without bearing [Details]LP pulley without bearing

In addition to choosing the correct pulley bearing, the selection of the appropriate groove diameter for the wire rope plays an important role. The following matrix will help you to find the right pulley for your application:

Recommended minimum diameter of the pulley

Rope constructionGroove diameter
in mm
in mm
Rope construction 6x7 WSC and 6x7+FC42 x Rope diameter
(uncoated)
Rope construction 6x19 WSC and 6x19+FC25 x Rope diameter
(uncoated)
Rope construction 8x19+7x716 x Rope diameter
(uncoated)
minimum diameter

B = Groove diameter

d = Wire rope diameter incl. coating

r = Groove radius= 0,53 x d

The service life of our tungsten cable can be up to 5 times longer than that of a 1.4401/AISI316 stainless steel rope of the same design. Compared to a stainless steel rope of the same design, a smaller pulley can be used for the same service life when using a tungsten rope. This enables a smaller and more compact (slimmer) construction.

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