This page estimates a sheet-metal neutral-axis position from thickness and inside radius using a simple empirical expression.
K-Factor Calculator
Form
Results
K-factor (K)
0
Location of neutral axis (t)
0
Table of Contents
1
What is K-Factor?
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How to Use This Calculator
- Enter or select Material thickness (T), Bend angle (θ), Bend allowance (BA), Inside radius (Rᵢ).
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
3
Formula Used
Neutral-axis distance=0.33T+0.44Ri; displayed K=distance/T.
4
Variables Explained
| Input | What it means |
|---|---|
| Material thickness (T) | Distance through the layer or material, rather than its face width. |
| Bend angle (θ) | The angle for the selected function, in degrees or radians as stated beside the input. |
| Bend allowance (BA) | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| Inside radius (Rᵢ) | Distance from the center to the circle’s edge; half the diameter. |
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Worked Example
With T=2 mm and Ri=1 mm, the estimated distance is 1.10 mm and K=0.55.
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Why Use This Calculator?
Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.
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Common Mistakes
- The current calculation does not use the entered bend allowance or bend angle. Do not mistake this approximation for a measured bend-allowance calculation.
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Frequently Asked Questions
When should I round a measurement?
Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.
Why can a supplier’s quantity differ?
Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.
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Sources & References
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