Cable Tray 90 Degree Turn with Four 22.5 Degree Folds

Define every original-stock interval

This layout divides a horizontal 90° change into 4 equal 22.5° folds in the same direction. Use a 200 mm base width, 50 mm side height, a 350 mm lead before the first axis and a 350 mm tail after the last. Keep the same outside wall connected at all 4 joints.

Measure the 300 mm pitch P between adjacent fold stations along the length direction of the original straight stock. There are 3 middle intervals. The first station is L and each following station adds P, giving 350 mm / 650 mm / 950 mm / 1,250 mm.

The stock station schedule remains the marking reference after the route is folded. Identify the retained outside edge when measuring the original blank. The straight inner-edge material between neighboring V openings is a separate value that can be read before forming.

Calculate the V for each individual fold

For total angle 90° and 4 folds, the individual angle is α = 90° / 4 = 22.5°. Calculate the half-notch as d = W tan(α/2). The full V opening is 2d. With W = 200 mm, use tan(11.25°), giving d = 39.78 mm and a full opening of 79.56 mm.

Each end must accommodate its adjacent half-notch plus the model's 10 mm margin. Each middle interval must accommodate two adjacent half-notches plus 10 mm, giving P ≥ 89.56 mm for these dimensions. At P = 300 mm, the inner-edge length between neighboring full V openings is P − 2d = 220.44 mm.

Total straight stock is L + (4 − 1)P + T = 350 + 3 × 300 + 350 = 1,600 mm. Changing pitch alters stock length and the formed route footprint. Each V opening continues to follow tray width and individual fold angle.

Worked example dimensions

Mark all openings and follow the same retained wall

At each stock station mark inner-edge endpoints at station − d and station + d, then join them to the retained-wall tip at the station. Inspect the 4 base wedges and matching inside-wall strips. Keep the outside wall continuous at every fold tip.

Use Original, Mark, Cut and Form to inspect each independent joint. Fold each by 22.5° and count the complete 90° change. The intermediate route is polygonal. Review all seams and the cable route with the actual tray profile and joining detail.

The three-30° guide has two middle stock intervals and totals 1300 mm at the same 300 mm pitch. Compare that complete layout with the four-fold route. Folding the total angle into more joints changes both the stock schedule and the positions of the finished route.

Review the fabrication detail

This example uses ideal sharp folds. Check material thickness, rolled lips, kerf and forming allowances, fastening and the actual cable turning space before fabrication.