Complete Guide to Marking Lines on 45-Degree Bends of Cable Trays
To create a 45-degree bend in a cable tray, mark two 22.5-degree cuts on separate tray sections to form a mitered joint.
Step-by-Step Marking Procedure
- Measure and Draw the Perpendicular Line Begin by measuring the width of the cable tray and drawing a perpendicular line across it. This line serves as the reference for your angle cuts .
- Mark the 22.5-Degree Angles Since a 45-degree bend is formed by joining two pieces, each piece contributes half the angle. Use a protractor or angle finder to mark 22.5 degrees from the perpendicular line on each tray section. Ensure the second piece's angle is in the opposite direction to the first to allow proper alignment .
- Determine Cut Points Along the Tray Lip For trays with flanged edges, measure from the centerline to mark the points where the lip will be removed. This ensures the cut edges will overlap correctly when bent .
- Draw Cutting Lines Connect the angle marks across the tray width to form straight cutting lines. For more complex bends, you can use a stretch-out method, dividing the tray edge into equal points and transferring them at a 45-degree angle to guide the cut .
- Optional Notches for Alignment For precise assembly, small notches can be added at the ends of each cut to indicate the exact bend location. This helps align the pieces during installation .
Tools and Safety
- Tools: Measuring tape, marker, square, protractor or angle finder, angle grinder or metal cutting saw.
- Safety: Wear gloves, safety glasses, and ear protection. After cutting, deburr and smooth all edges to protect cables and prevent injuries .
Assembly
After marking and cutting, test-fit the two tray sections. The 22.5-degree cuts should form a smooth 45-degree bend when joined. Secure the pieces using appropriate cable tray connectors and hardware to ensure stability . By following these steps, you can accurately mark and prepare a cable tray for a 45-degree bend, ensuring a clean, safe, and functional installation.
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