How to mark lines on a 45-degree bend in a cable tray

To create a 45-degree bend in a cable tray, mark two 22.5-degree cuts on separate tray sections from a perpendicular line, ensuring the cuts face opposite directions for proper joining.Step-by-Step Marking Process1. Measure and Draw the Center Line Start by measuring the width of the cable tray and draw a perpendicular line across the tray at the point where the bend will occur. This line serves as the reference for your angle cuts . 2. Determine the Cut Angle Since a 45-degree bend is formed by joining two pieces, each piece contributes half the angle. Therefore, mark 22.5 degrees from the perpendicular line on each tray section. Use a protractor or angle finder for accuracy . 3. Mark the Opposite Direction on the Second Piece For the second tray section, mark the 22.5-degree line in the opposite direction to the first piece. This ensures the two pieces will fit together to form a smooth 45-degree bend . 4. Mark the Lip or Flange Cuts If the tray has flanged edges, measure from the center line to mark the points where the lip will be trimmed. This allows the cut surfaces to overlap correctly when bending . 5. Optional Triangle Method for Trunking For some tray types, you can use a triangle method: divide the tray width in half to find the middle line, then draw a triangle on each side according to the scale. The triangle's sides guide where to cut to form a tongue for insertion . 6. Safety and Verification Always wear gloves, safety glasses, and ear protection while marking and cutting. After marking, double-check measurements and angles before cutting to avoid errors . 7. Test Fit Before final installation, test-fit the two cut pieces to ensure they form a precise 45-degree angle. Adjust markings slightly if necessary for a snug fit .Tools NeededMeasuring tapeMarker or scribeSquare or straight edgeProtractor or angle finderOptional: cardboard for trial cutsSafety gear: gloves, glasses, ear protection By following these steps, you can accurately mark lines on a cable tray for a 45-degree bend, ensuring a clean, safe, and precise installation.