Maximum material condition applied to straightness

Figure 22.2 shows a typical drawing instruction where limits of size are applied to a pin, and in addition a straightness tolerance of 0.2 is applicable at the maximum material condition.

0 20

0 0.2 (M)

Figure 22.3 shows the condition where the pin is finished at the maximum material condition with the maximum straightness error. The effective assembly diameter will be equal to the sum of the upper limit of size and the straightness tolerance.

0 20.7 Effective assembly diameter

Figure 22.3 shows the condition where the pin is finished at the maximum material condition with the maximum straightness error. The effective assembly diameter will be equal to the sum of the upper limit of size and the straightness tolerance.

0 20.7 Effective assembly diameter

0 0.2 Tolerance zone

0 0.2 Tolerance zone

Straightness error contained within the cylindrical tolerance zone

The straightness error is contained within a cylindrical tolerance zone of 0 0.2.

To provide the same assembly diameter of 20.7 as shown in Fig. 22.4 when the pin is finished at its low limit of size of 20.0, it follows that a straightness error of 0.7 could be acceptable. This increase may in some cases have no serious effect on the function of the component, and can be permitted.

0 20.7 Effective assembly diameter

0 20

0 20.7 Effective assembly diameter

0 0.7 Tolerance zone

0 0.7 Tolerance zone

Straightness error contained within the cylindrical tolerance zone

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