CALCULATORS / WIRES, CABLES AND HARNESSES

Cable bend-radius screening calculator

Radius compared with a supplied cable-diameter multiplier; no automatic standard selection.

wires-bend-radius.napkin / editable

SCENARIO COMPARISON

Compare the numbers.

This source describes an analytical model. Its quantities and checks are the view.

Scenario	minimumRadiusmm
	30
	24

All calculated quantities are listed with the inputs. Switch to Source to inspect the equations.

SCENARIOS / CALCULATED VALUESSAME SOURCE

Change an input to see the consequences.

bend radius sufficient40.00 mm✓ passes

BASELINE INPUTS

diameter5 mmmultiplier6 availableRadius40 mm

CALCULATED

minimumRadius30 mm

Edits change the baseline source.

THE SOURCE

Edits below update the same model.

# Cable bend-radius screening
# Scope: Radius compared with a supplied cable-diameter multiplier; no automatic standard selection.
# Status: illustrative worked example; engineering review pending.
# Inputs are example values. Checks are editable example requirements, not standards.

diameter = 5 mm
multiplier = 6
availableRadius = 40 mm

minimumRadius := diameter*multiplier [mm]

check bend radius sufficient: availableRadius >= minimumRadius

scenario alternative: diameter = 4 mm

Calculated from your source · not saved

Baseline · Baseline

bend radius sufficient40.00 mm ✓ passes

alternative · alternative

bend radius sufficient40.00 mm ✓ passes

Illustrative first-order example. Checks are editable requirements, not design standards. The broader topic may require additional equations, data, and validation.

Formula and units

This example uses the following equations. Input names and units match the editable source above.

minimum radius: minimumRadius = diameter*multiplier [mm]

Original worked example

These are the baseline values in the downloadable source. Edits above let you test your own values.

Given

diameter: 5 mm
multiplier: 6
available radius: 40 mm

Calculated

minimum radius: 30 mm

Assumptions and limits

Radius compared with a supplied cable-diameter multiplier; no automatic standard selection.

The requirement checks use the limits written in this example. Passing a check does not establish that the model covers every load, material behavior, or operating condition in a real design.

Download this .napkin example ↓

Take it further with your agent

Napkin keeps the inputs, equations, checks and assumptions together in one study. Your agent sets it up; you change the numbers.

Try with Claude ↗

codex 'Use Napkin (https://napkin.engineering/mcp, or the local Napkin plugin) to build a study: Cable bend-radius screening. Inputs: cable diameter; flex duty; sourced minimum radius. Outputs: bend envelope; rule comparison. Model scope: Conductor geometry and sourced installation/component limits. Read napkin_capabilities and the current snapshot. Ask me for the values that matter, label assumptions with units, author .napkin source, validate it and apply it with napkin_source using the current revision, then open the study. Add checks for the limits I supply. Keep unsupported analyses explicit.'

Claude needs the Napkin connector; Codex needs the Napkin plugin. Set up your agent ↗

The broader study

The topic brief below describes the broader scope. The worked example above states the particular calculation it implements.

Inputs: cable diameter, flex duty, sourced minimum radius
Outputs: bend envelope, rule comparison
Modes: calculate, compare, sweep
Drawing: Harness and voltage-drop diagram

EXECUTABLE WORKED EXAMPLE · FIRST-ORDER MODEL · CHECK THE SCOPE & ASSUMPTIONS