Herramientas prácticas para trabajos de precisión
Trazado de Fabricación de Desvío Enrollado de Conducto
Calcule el recorrido, el avance y el ángulo de giro (roll) de un desvío enrollado, con una plantilla imprimible de corte de codo a inglete.
Calcule el diseño, revise el diagrama y luego imprima el resultado para el taller o la obra.
Vertical offset between the two duct centerlines.
Horizontal/sideways offset - this is what makes it a rolled offset rather than a same-plane offset.
Standard fabrication angle - typically 30, 45 or 60°.
Cut two of the pattern shown (mirror-image pair) - one for each elbow. Mark the dashed start line on the actual duct at the stated angle around from your top-of-duct reference before tracing the cut.
Cómo funciona
Why a rolled offset is different. A same-plane offset moves the duct sideways or up in a single direction, and both elbows can be cut and oriented with the cut's long point facing straight up. A rolled offset moves the run in two directions at once (rise and roll), so the true offset is the diagonal between them, and - critically - the miter cut has to be rotated around the duct's own circumference to point along that diagonal. Skipping that rotation is the most common way a rolled-offset fitting comes out misaligned.
Calculation. True offset = √(rise² + roll²). Roll angle (how far to rotate the cut from the rise direction) = atan(roll ÷ rise). Travel = true offset ÷ sin(elbow angle). Advance = true offset ÷ tan(elbow angle). Each elbow's cut angle (from square) is half the chosen elbow angle, using the same tilted-cylinder unroll as the segmented elbow tool.
Worked example. With the defaults (300 mm rise, 400 mm roll - a 3-4-5 triangle), the true offset is exactly 500 mm and the roll angle is 53.1° from the rise direction. At a 45° elbow angle, travel is ≈ 707 mm and advance is exactly 500 mm.
Ejemplo con los datos actuales
El resultado anterior utiliza exactamente estos valores. Esta captura se incluye al imprimir para cotejar la salida con las medidas originales.
- Rise
- 300 mm
- Roll (set)
- 400 mm
- Duct/pipe diameter
- 200 mm
- Elbow angle
- 45 deg
Resultado principal: True offset: 500.0 mm.
Antes de usar el resultado
- 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.
Limitaciones
This lays out the two elbow cuts only; it does not size straight duct lengths beyond travel and advance, or account for duct wall thickness, liner, or flange allowances - add those separately.
For a rectangular duct, the miter cut is a straight angled line across the duct rather than the curved profile shown here (which applies to round pipe/duct); the roll angle and cut angle numbers still apply, but you won't need the printable template.
Preguntas frecuentes
What if my roll is zero?
With no roll, this is a standard same-plane offset - the roll angle comes out to 0°, meaning no rotation around the duct is needed; the cut's long point faces straight along the rise direction as usual.
Which elbow angle should I choose?
45° is the most common for a good balance of travel length and flow resistance; 30° and 60° are also standard stock angles. A smaller angle gives a longer, gentler offset; a larger angle gives a shorter, tighter one.
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