To use wire rope grips effectively for forming a loop or eye, follow proper installation steps focusing on spacing and grip placement.
Using wire rope grips (sometimes called cable clamps or Crosby clips) is a common method for creating a secure loop or eye at the end of a wire rope. Correct installation is crucial for safety and strength.
Key Steps for Installing Wire Rope Grips
Proper installation involves preparing the rope, placing the grips correctly, and ensuring they are tightened to the required specification.
1. Prepare the Cable and Eye
- Form the desired loop or eye size in the wire rope.
- Ensure the dead end (the short end of the rope that isn't carrying the load) overlaps the longer, live end.
2. Mark Grip Positions
- Mark the cable to show the spacing of the grips.
- This spacing is approximately six times the rope diameter between each grip position. For example, on a 1/2 inch (approx. 12mm) rope, the spacing would be around 3 inches (approx. 72mm).
- The number of grips required depends on the diameter and construction of the wire rope, typically increasing with rope size. Consult manufacturer guidelines or safety standards.
3. Position the First Grip
- Place the first grip closest to the thimble (if used) or the eye.
- Position the U-bolt against the dead end of the rope. The saddle (the flat part) should be against the live end. This is critical for maintaining the rope's strength.
- Tighten the nuts evenly finger-tight.
4. Position Remaining Grips
- Place the second grip as far from the eye as necessary, near the end of the dead end. Position the U-bolt against the dead end as before.
- Place any additional grips required at the marked spacing positions between the first two grips, ensuring the U-bolt is against the dead end on each.
5. Tighten the Grips
- Tighten all nuts evenly on each grip using a wrench, alternating between nuts to ensure even pressure.
- Tighten the nuts until the saddle is firm against the rope. Refer to manufacturer specifications for the correct torque value, as overtightening can damage the rope.
6. Re-Tighten After Loading
- After the wire rope assembly has been put under load for the first time, the grips should be re-tightened. Loading can cause the rope strands to seat, slightly loosening the grips.
- Periodically inspect the grips for wear, corrosion, or slippage and re-tighten if necessary.
Summary of Grip Installation
| Step | Action | Key Consideration |
|---|---|---|
| Preparation | Form eye, overlap dead and live ends. | Ensure dead end is accessible for grip placement. |
| Marking | Mark spacing for grips. | Spacing is approx. 6 times rope diameter. |
| Grip Placement | Install grips at marked positions. | U-bolt against the dead end on every grip. |
| Initial Tighten | Tighten nuts evenly on all grips. | Use appropriate torque (check manufacturer specs). |
| Final Check | Re-tighten after initial loading. | Ensures grips remain secure after rope settles. |
Following these steps, particularly the correct U-bolt placement and spacing guidelines, ensures a safe and reliable wire rope termination.
