How to mark lines on a 90-degree bend in a cable tray

Mark the center line across the tray width and measure equal distances on both sides to guide the 90-degree bend accurately.Step-by-Step Marking Process1. Prepare the Tray: Ensure the cable tray is clean and placed on a stable work surface. Use a pencil for marking to avoid permanent scratches on the metal surface . 2. Mark the Center Line: Measure the full width of the tray and draw a straight center line across the base. This line serves as the reference for bending and ensures symmetry . 3. Determine Flange Measurements: For a flat 90-degree bend, calculate the amount of tray lip to remove. Typically, this is three-quarters of the tray width, with half removed on each side of the center line . 4. Mark Cut Lines: Using a set square or protractor, mark the points for cuts or notches. For a mitered 90-degree elbow, mark 45-degree cuts on the side channels from the center line, ensuring the cuts are equal on both sides . 5. Mark Base V-Notches (if required): For fabricated bends, mark V-shaped sections on the tray base where the bend will occur. This allows the sides to close together smoothly during bending . 6. Check and Verify: Double-check all measurements and markings before cutting or bending. Ensure the lines are straight, symmetrical, and match the required dimensions . 7. Optional Gusset Marking: If adding a gusset for reinforcement, measure the distance between internal edges of the bend and mark the gusset piece accordingly . Following these steps ensures that the 90-degree bend is precise, symmetrical, and ready for cutting, bending, and assembly. Proper marking reduces errors and maintains the structural integrity of the cable tray.