Carl Stahl TECHNOCABLES

Pulleys

If ropes run over over pulleys the working life can be extended by the right choice of pulley and suitable wire rope.

The working life of the rope depends on the following factors:

  • Groove geometry
  • Ratio between groove diameter and rope diameter
  • Surface quality of the groove
  • Material of the pulley
  • Rope construction

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

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