Get the most out of your Wire Rope
The service life of cable and wire rope can be increased if (1) it operates over the largest possible pulley or sheave diameter, and (2) it is properly supported in the pulley or sheave groove. The working life of the individual wire strands is greatly reduced as the pulley or sheave diameter is diminished. The chart below shows minimum tread diameters over which various sizes and constructions of cable should operate.
The recommendations below are based on the standard D:d ratio where:
D = diameter of the pulley at it's grove
d = diameter of the aircraft cable or wire rope
Minimum Tread Diameter for Pulleys or Sheaves
RATIO OF PULLEY DIAMETER TO CABLE DIAMETER (D:d)| Desired Minimum | Critical Minimum | ||||||
|---|---|---|---|---|---|---|---|
| 42:1 | 24:1 | 12:1 |  | 28:1 | 18:1 | 10:1 | |
| Construction | | Construction | |||||
| Cable Diameter | 6x7 or 7x7 | 6x19 or 7x19 | 6x31 or 6x37 | | 6x7 or 7x7 | 6x19 or 7x19 | 6x31 or 6x37 |
| 1/16 | 2-5/8 | ---- | ---- | | 1-3/4 | ---- | ---- |
| 3/32 | 2-15/16 | 2-1/4 | ---- | | 2-5/8 | 1-11/16 | ---- |
| 1/8 | 5-1/4 | 3 | ---- | | 3-1/2 | 2-1/4 | ---- |
| 5/32 | 6-9/16 | 3-3/4 | ---- | | 4-3/8 | 2-7/8 | ---- |
| 3/16 | 7-7/8 | 4-1/2 | ---- | | 5-1/4 | 3-3/8 | ---- |
| 7/32 | 9-13/16 | 5-1/4 | ---- | | 6-1/8 | 4 | ---- |
| 1/4 | 10-1/2 | 6 | 3 | | 7 | 4-1/2 | 2-1/2 |
| 5/16 | 13-1/8 | 7-1/2 | 3-3/4 | | 8-3/4 | 5-5/8 | 3-1/8 |
| 3/8 | 15-3/4 | 9 | 4-1/2 | | 10-1/2 | 6-3/4 | 3-3/4 |
| 7/16 | 18-3/8 | 10-1/2 | 5-1/4 | | 12-1/4 | 7-7/8 | 4-3/8 |
| 1/2 | 21 | 12 | 6 | | 14 | 9 | 5 |
| 9/16 | 23-5/8 | 13-1/2 | 6-3/4 | | 15-3/4 | 10-1/8 | 5-5/8 |
| 5/8 | 26-1/4 | 15 | 7-1/2 | | 17-1/2 | 11-1/4 | 6-1/4 |
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