100 % interchangability and Six Sigma assembly and part tolerance analysis calculator.
Use this calculator to:
 Determine if the parts will assemble 100% of the time, or will assemble 99.73% (± 3 sigma) of the time statistically.
 Done to determine if the parts will function properly at worst condition.
 Determine if the drawing tolerance can be larger.
 Determine if statistical tolerancing will give a lower cost product.
 A fully documented tolerance analysis provides a record of the design dimensional requirements that can be reviewed at a later date in case of a product failure.
For more details and related resources see:
± 3σ is equal to the sum of the squares for each bilateral tolerance


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100% Interchangabilty and ± 3σ tolerances using bilateral uneven tolerances.
100% Interchangabilty and ± 3σ tolerances using bilateral tolerances.
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