Tolerance Accumulation

Figure 2-4 compares the tolerance values resulting from three methods of dimensioning.

(a) Chain Dimensioning. The maximum variation between two features is equal to the sum of the tolerances on the intermediate distances; this results in the greatest tolerance accumulation. In Fig. 2-4(a), the tolerance accumulation between surfaces X and Y is ±0.15.

(b) Base Line Dimensioning. The maximum variation between two features is equal to the sum of the tolerances on the two dimensions from their origin to the features; this results in a reduction of the tolerance accumulation. In Fig. 2-4(b), the tolerance accumulation between surfaces X and Y is ±0.1.

(c) Direct Dimensioning. The maximum variation between two features is controlled by the tolerance on the dimension between the features; this results in the least tolerance. In Fig. 2-4(c), the tolerance between surfaces X and Y is ±0.05.

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  • helen russom
    What is tolerance accumulation?
    1 year ago
  • Katrin
    What is accumulating tolerances?
    8 months ago

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