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THE FEUTEX TOOLKIT

Capstan Belt Transmission Model

Estimate limiting tension ratio, transmitted power and bearing load.

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02 Your result
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FormulaTtight/Tslack=e^(µθ); P=(Ttight−Tslack)v.
Sources and model references

Worked example

Inputs

Slack-side tension
100 N
Friction coefficient
0.3
Wrap angle
180 degrees
Belt speed
5 m/s

Expected results

Limiting tight-side tension
256.6332395 N
Limiting transmitted power
783.1661976 W
Approximate parallel-span bearing load
356.6332395 N

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter every input in the labeled units; use measured or independently specified properties.
  2. Check the stated model assumptions before calculating.
  3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "slack": 100,
  "mu": 0.3,
  "wrap": 180,
  "speed": 5
}

Accuracy and scope

Ideal flat belt at impending slip; radial approximation assumes parallel spans; ignores centrifugal tension. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.