Perpendicularity From Tolerance Of Position
A Tolerance Of Position callout controls orientation as well as location. The following figures illustrate how Tolerance Of Position controls the perpendicularity of a hole.
The figure shows first a Perpendicularity and then a Tolerance Of Position. The top line shows the Perpendicularity callout and then the meaning of the Perpendicularity. In this case, since the Perpendicularity is called out MMC, it specifies a boundary that must not be violated. The boundary is perpendiculary to datum [A], and the diameter of the boundary is equal to the Virtual Condition. In this case, the boundary is the MMC size of 9.5 plus the Perpendicularity of 0.3.
The bottom line shows the Tolerance Of Position callout on the left and the meaning on the right. The pin is restricted by exactly the same boundary as in the top line. Since the Tolerance Of Position is called out to datum [A] only, the boundary is not located relative to anything. Therefore the Tolerance Of Position has exactly the same meaning as the Perpendicularity.
A Tolerance Of Position callout controls orientation as well as location. The following figures illustrate how Tolerance Of Position controls the perpendicularity of a hole.
The figure shows first a Perpendicularity and then a Tolerance Of Position. The top line shows the Perpendicularity callout and then the meaning of the Perpendicularity. In this case, since the Perpendicularity is called out MMC, it specifies a boundary that must not be violated. The boundary is perpendiculary to datum [A], and the diameter of the boundary is equal to the Virtual Condition. In this case, the boundary is the MMC size of 9.5 plus the Perpendicularity of 0.3.
The bottom line shows the Tolerance Of Position callout on the left and the meaning on the right. The pin is restricted by exactly the same boundary as in the top line. Since the Tolerance Of Position is called out to datum [A] only, the boundary is not located relative to anything. Therefore the Tolerance Of Position has exactly the same meaning as the Perpendicularity.
The next figure shows the same situation as above except with an internal Feature Of Size. The Perpendicularity specifies a 9.1 boundary inside the hole that must not be violated. The boundary is perpendicular to datum [A].
The Tolerance Of Position specifies exactly the same boundary. Again, this boundary is perpendicular to [A] but not located to any datums. So once again the Perpendicularity and the Tolerance of Position have exactly the same meaning.
The Tolerance Of Position specifies exactly the same boundary. Again, this boundary is perpendicular to [A] but not located to any datums. So once again the Perpendicularity and the Tolerance of Position have exactly the same meaning.
The next figure shows an external Feature Of Size with a Perpendicularity and a Tolerance Of Position both at RFS. In both cases, the axis of the pin must fall within a tolerance cylinder that is perpendicular to datum [A] and has diameter 0.3. In both cases, the tolerance cylinder is not located to any datums. Therefore the Perpendicularity and the Tolerance Of Position have exactly the same meaning.
The final figure shows an internal Feature Of Size with Perpendicularity and Tolerance Of Position called out RFS. In both cases, the axis of the hole must fall within a tolerance cylinder that is perpendicular to datum [A] and has diameter 0.3. The tolerance cylinder is still not located to any datums, so the Tolerance Of Position and the Perpendicularity have exactly the same meaning.
