Desarrollador de Patrón de Codo Segmentado (Cola de Langosta)

How to use it: enter the pipe or duct diameter, the centerline radius of the overall bend you want, the total elbow angle (90° for a standard elbow), and how many straight pieces to build it from. More pieces give a smoother-looking bend and less flow resistance, at the cost of more cutting and welding/seaming.

Method: tangent-line construction. The bend's centerline arc is approximated by straight pieces tangent to it, changing direction at each joint. This gives the standard result: cut angle per joint = total angle ÷ (2 × (pieces − 1)) - the same angle at every joint. End pieces get one angled cut (mating to straight pipe on the square end); every middle piece gets two opposing cuts.

Flat pattern. A cylinder sliced by a plane tilted at the joint angle unrolls into a cosine curve - long on the outside of the bend, short on the inside, with amplitude = pipe radius × tan(joint angle). All middle pieces are geometrically identical, as are both end pieces, so the diagram shows one of each: cut the quantities noted below it.

El resultado anterior utiliza exactamente estos valores. Esta captura se incluye al imprimir para cotejar la salida con las medidas originales.

Pipe/duct diameter

200 mm

Bend centerline radius

400 mm

Total elbow angle

90 deg

Number of pieces

4

Resultado principal: Miter (cut) angle per joint: 15.00 deg.

• Measure from the datum or reference edge described by this tool, and do not mix inside, outside and centerline dimensions.
• Keep inputs in the displayed units and preserve more precision than the final cutting or purchasing tolerance requires.
• When the result is close to a limit, verify it with a test piece, field measurement, manufacturer drawing or qualified project professional.

If the short (inside) length of a piece would come out at zero or below, the combination of diameter, bend radius, angle and piece count is not physically buildable - the calculator returns no result in that case. Increase the bend radius, reduce the angle, or add more pieces.

The pattern is the bare developed geometry only - add seam allowance for a welded or lock-seamed joint separately, on the outside of the printed outline.