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Profile Controls

Circular Runout

Total Runout

Another Profile Tip, Another Circular Runout Tip

A lot of confusion exists over the meaning of the geometric tolerances shown in the chart. February's Tip illustrated possible inspection methods for position and concentricity. This month's Tip continues with sample inspection methods for circular and total runout and profile.  these drawings is the same, the designer should consider the needs of those who will read the print when placing dimensions.

Circular runout requires inspecting circular elements individually. Because of this, circular runout will not detect changes in size. Any barreling, waisting or taper should be ignored. These conditions will be controlled by the size tolerance.

Total runout requires determining the full indicator movement over the entire feature. Total runout, therefore, detects any changes in size, i.e. barreling, waisting or taper. Although changes in size are controlled, the actual size of the feature is determined and controlled by the size dimension and tolerance. A feature may be manufactured to a very tight size tolerance but due to eccentricity, the runout could be large. Total runout controls form, orientation and location but not size.  Profile controls everything that total runout does as well as size if the size dimension is made BASIC. 

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