Segment Bend Layout Chart

Use this segment bend layout chart after the calculator result to document equal bend angle, target radius, chord step, arc reference, and station marks.

Open calculator

Quick reference table

A segmented conduit bend divides one large direction change into smaller equal bends. The calculator result gives angle per bend, target radius, arc length, chord step, and optional station marks. Use this chart to choose a bend count that looks smooth, fits the available length, and can actually be marked on the conduit.

Equal-angle segment layout choices

Equal-angle segment layout choices
Total angle	Number of bends	Angle per bend	Field use
45 deg	3	15 deg	Simple shallow direction change
60 deg	4	15 deg	Moderate sweep with manageable marks
90 deg	6	15 deg	Common smooth quarter-turn reference
90 deg	9	10 deg	Smoother appearance with more marks
180 deg	12	15 deg	Large sweep planning reference

Marking decisions after the calculator result

Marking decisions after the calculator result
Result item	Field decision	Risk if skipped
Chord step	Use as straight mark spacing	Arc length can over-space straight marks
Arc length	Use as developed curve reference	Curve may not match target radius
First mark reference	Measure from conduit end or relative zero	Entire station set shifts
Bend count	Balance smoothness with time and accuracy	Too few bends looks kinked; too many marks compound error

Formula basis

Angle per bend = total angle / number of bends. Arc length = radius x radians. Chord step = 2 x radius x sin(angle per bend / 2).

Total angle is the full directional change through the segmented bend.
Number of bends is the count of equal bends planned through the section.
Radius is the target centerline radius used for the smooth-arc reference.
Chord step is the straight-line station spacing between equal-angle bend marks.

Worked examples

90 degree bend in 6 equal bendsAngle per bend = 90 / 6 = 15 deg. Use the calculator radius to get chord step and station marks instead of spacing the marks by arc length.

Increase smoothness with 9 bendsA 90 degree bend with 9 equal bends uses 10 deg at each mark. It can look smoother, but every extra mark adds a chance for cumulative layout error.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The chart is a geometry reference for equal-angle bends and does not model every bender shoe or conduit stiffness condition.
The first mark can be a measured reference or a relative zero point depending on how the calculator was used.
Finished sweep quality depends on consistent mark spacing, bend angle control, support, and keeping the conduit in the correct plane.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use this as a geometry worksheet and verify final bend radius, appearance, conduit behavior, support clearance, and job requirements in the field.

How to use this chart

1Set the total bend angleStart with the actual direction change needed, then divide it into a bend count that is practical to mark and bend.

2Use calculator chord spacingRecord target centerline radius, chord step, and arc reference so station marks stay tied to the same geometry.

3Document station marksCopy the station marks from the calculator and label whether they are measured from the conduit end or relative to Mark 1.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Record equal-bend dataWrite total angle, number of bends, angle per bend, and target radius before transferring station marks.
Record spacing dataDocument chord step, arc length, first-mark reference, and station list used for the layout.
Record field resultAfter bending, note whether appearance, radius, plane, and endpoint alignment matched the planned curve or required correction.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Using arc length as straight mark spacing without checking the calculator chord-step result.
Changing the number of bends after marks are transferred without recalculating angle per bend and station spacing.
Letting small bend-angle errors accumulate until the final sweep misses the intended endpoint.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Should I mark by arc spacing or chord spacing?

Use chord spacing for straight mark layout. Arc length documents the target smooth curve but is not the same as straight-line station spacing.

Why not use many tiny bends every time?

More bends can look smoother, but they take longer and every mark or angle error can accumulate through the sweep.

What should I record after bending?

Record whether the finished radius, plane, and endpoint matched the plan, plus any mark-spacing correction used in the field.