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THE FEUTEX TOOLKIT

Three-Part Tolerance Stack

Compare worst-case and root-sum-square assembly tolerance.

Manufacturing workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaAssembly=A+B−C; worst-case=Σti; RSS=√Σti².
Sources and model references

Worked example

Inputs

Nominal part A
10 mm
Nominal part B
20 mm
Nominal part C
5 mm
Symmetric tolerance A
0.1 mm
Symmetric tolerance B
0.2 mm
Symmetric tolerance C
0.1 mm

Expected results

Nominal A+B-C dimension
25 mm
Worst-case half tolerance
0.4 mm
RSS half tolerance
0.2449489743 mm

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

{
  "a": 10,
  "b": 20,
  "c": 5,
  "ta": 0.1,
  "tb": 0.2,
  "tc": 0.1
}

Accuracy and scope

RSS assumes independent centered component variation with consistent statistical interpretation; worst-case tolerance limits are not standard deviations. 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.