Cable tray bend cutting techniques

Cable tray bends are typically created using mitered cuts, V-notches, or multiple angled cuts, with careful measurement and proper tools to ensure precise 90-degree or custom bends.Common Cutting and Bending Techniques

1. Mitered or Fabricated 90-Degree Bends

• Mark the center line where the bend is desired.
• Measure and mark two 45-degree cuts on the tray flanges. The distance from the center line depends on tray width (typically 45–82 mm).
• Cut the side channels at 45 degrees and create V-notches in the base to allow the sides to meet when bent.
• Bend the tray at the center to close the V-cuts, forming a precise 90-degree elbow.
• Fasten the bent sections with bolts, nuts, and washers, and apply cold galvanizing spray for rust protection if needed . 2. Multi-Cut Bends for Larger Trays
• For wider trays (e.g., 300 mm), three cuts may be used to distribute the bend evenly and reduce stress on the material.
• Each cut is carefully measured to maintain alignment and structural integrity . 3. Straight Cuts for Installation or Custom Lengths
• Use a band saw or circular saw with a blade suitable for the tray material to achieve clean cuts with minimal burrs.
• Angle grinders can be used for flexibility but require careful handling to avoid sparks, overheating, or injury.
• Cutting torches are generally not recommended, as they can damage surface coatings and weaken the tray .

Tools and Safety Considerations

• Measuring tools: tape measure, set square, protractor
• Cutting tools: angle grinder, hacksaw, band saw, circular saw
• Fastening tools: drill, drill bits, nuts, bolts, washers
• Safety gear: Kevlar gloves, eye protection, head protection, footwear, and PPE for sparks or debris
• Ensure the tray is rigidly supported during cutting to prevent chipping or deformation .

Best Practices

• Cut between pre-existing holes or openings to maintain torsional strength.
• Avoid excessive pressure or heat during cutting to prevent rough edges or material weakening.
• For FRP or fiberglass trays, cut in 300 mm increments for optimal strength.
• Always follow local health and safety regulations and manufacturer-specific guidelines . By following these methods, installers can create precise bends, elbows, and custom tray lengths while maintaining structural integrity and safety.