The formula below may be used to calculate reel capacities with at least one wire rope diameter below the flange diameter for clearance x.
Minimum drum diameter for wire rope.
1 over the actual wire rope diameter groove depth h.
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Minimum 0 53 to 0 535 x d maximum 0 55 x d recommended.
The bend radius of the rope is approximately half of the minimum recommended pulley tread diameter.
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It is impossible to give a definite minimum size of sheave or drum about which a wire rope will operate with satisfactory results because of the other factors affecting the useful life of the rope.
Sheave dimensions we recommend only sheaves made of steel or cast steel.
The tables below provide the minimum recommended pulley diameter.
In general the larger the size of the drum or pulley with respect to the wire diameter the longer the service life.
Sheaves drums and rollers must be of a correct design if optimum service is to be obtained from both the equipment and the wire rope.
If the loads are light or the speed slow smaller sheaves and drums can be used without causing early fatigue of the wires than if the loads are.
Sheave design is critical to wire rope service life bending wire rope over sheaves and drums.
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Sheave and drum diameter all wire ropes operating over sheaves and drums are subjected to bending stresses which eventu ally cause the wire rope to fatigue.
B diameter of drum in inches or mm c width of drum between flanges in inches or mm k π 12 d2 when capacity is required in feet k π 1000 d2 when capacity is required in meters k constant for a given wire rope diameter as per table below and d rope diameter in inches or mm.
1 5 x d or d x 2 sheave throat angle.
Due to tolerances on diameters and variety of constructions of wire rope it is difficult to calculate the maximum length of wire rope that can be spooled on a reel or drum.
The following are recommended values.
The severity of these stresses are directly related to the rope load and the d d ratio or the ratio of the tread diameter of the sheave or drum d to the diam eter of the rope d.
Table for value of constant.
