How does the sheet metal bend allowance calculator work?
Neutral-axis single-bend development from an entered calibration factor, not an automatically selected material bend table. Legs are outside dimensions to the virtual sharp corner. Mixing tangent lengths and outside dimensions gives the wrong flat pattern.
Which measurements do you need for sheet metal bend allowance?
Legs are outside dimensions to the virtual sharp corner. Mixing tangent lengths and outside dimensions gives the wrong flat pattern. Measure the actual installed geometry or quoted quantity rather than substituting a nominal product size.
Which formula calculates sheet metal bend allowance?
Bend allowance = bend radians × (inside radius + K × thickness); deduction = 2 × outside setback − allowance; flat = outside legs − deduction.
What does a sheet metal bend allowance worked example show?
A 90° bend with 2 mm inside radius, 1 mm thickness and K-factor 0.4 has approximately 3.76991 mm bend allowance.
Which units apply to sheet metal bend allowance?
Use the labeled units in the input reference below. The Imperial / Metric selection converts fields with dynamic unit labels. Fixed-unit fields retain the units printed in their labels.
Leave optional inputs blank when unavailable. Required fields and paired data are checked before a result is displayed.
| Input | Units | When used |
|---|---|---|
| Bend angle from flat (degrees) | as labeled | all modes |
| Inside bend radius (mm) | as labeled | all modes |
| Sheet thickness (mm) | as labeled | all modes |
| Verified K-factor (0 to 1) | as labeled | all modes |
| Outside flange A to virtual sharp corner (mm) | as labeled | all modes |
| Outside flange B to virtual sharp corner (mm) | as labeled | all modes |
Which assumptions change the sheet metal bend allowance result?
Neutral-axis single-bend development from an entered calibration factor, not an automatically selected material bend table. Legs are outside dimensions to the virtual sharp corner. Mixing tangent lengths and outside dimensions gives the wrong flat pattern.
How should you check the sheet metal bend allowance estimate?
Legs are outside dimensions to the virtual sharp corner. Mixing tangent lengths and outside dimensions gives the wrong flat pattern. Keep measured values separate from any extra allowance or quoted price. Check the resulting unit and rounding before ordering or using the result.
How can you compare sheet metal bend allowance scenarios?
Calculate one baseline and add it to comparison. Change one measured input or verified product value and calculate again. Comparison keeps the itemized inputs and results so the changed assumption remains visible.
How can you save or share the sheet metal bend allowance result?
After calculation, copy or share the result, download the worksheet or print the inputs and result. Embed and citation controls are in the header. Clear changes removes the current worksheet, and a browser refresh opens blank numeric inputs.
Which related tools help with sheet metal bend allowance?
Use Recessed Lighting Calculator, True Position Calculator, Box Fill Calculator for related project quantities. Each tool has its own scope; avoid transferring a result without checking its unit and assumptions.
