napkin.
Menu

CALCULATORS / SHEET METAL, FORMING AND WIRE

Bend springback compensation calculator

Bend command from a supplied measured springback angle; no material prediction.

sheet-metal-springback.napkin / editable
✓ checks pass

SCENARIO COMPARISON

Compare the numbers.

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

Scenariocommanddeg
93
75

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.

tool rotation budget93.00 deg✓ passes

BASELINE INPUTS

CALCULATED

command93 deg

Edits change the baseline source.

Calculated from your source · not saved
Baseline · Baseline
tool rotation budget93.00 deg ✓ passes
alternative · alternative
tool rotation budget75.00 deg ✓ 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.

command
command = target+measuredSpringback [deg]

Original worked example

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

Given

target
90 deg
measured springback
3 deg

Calculated

command
93 deg

Assumptions and limits

Bend command from a supplied measured springback angle; no material prediction.

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: Bend springback compensation. Inputs: geometry; material data; measured process response. Outputs: candidate overbend; uncertainty. Model scope: Specified bend geometry and calibrated material/process factors. 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: geometry, material data, measured process response
  • Outputs: candidate overbend, uncertainty
  • Modes: calculate, compare, sweep
  • Drawing: Flat pattern and forming sequence

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

More in sheet metal, forming and wire