What type of tolerance is perpendicularity?

Perpendicularity tolerance is a three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from a 90 degree angle or it is can be defined as a condition of a surface, median plant, or axis at 90 degree to a datum plane or axis.

How is perpendicularity tolerance measured?

Using a Square Ruler and Feeler Gauge Hold the square ruler against the target. Measure the gap between the square ruler and the target using a feeler gauge or pin gauge. This gap indicates the perpendicularity.

What does the perpendicularity tolerance specified in a feature control frame represent?

The surfaces must be perpendicular within the tolerance limits specified in the feature control frame. Surface perpendicularity does not directly control the angle between the surfaces. Instead, it ensures perpendicularity by defining the location where the surface must lie for approval.

What is the effect of using the T modifier with a perpendicularity tolerance?

The circle T modifier maintains the tighter orientation tolerance, but allows the flatness to be controlled by Rule #1. The tangent plane symbol may be applied to any orientation control of a planar surface. The tangent plane concept allows the acceptance of more parts and reduced costs.

How do you use perpendicularity?

Axis Perpendicularity can be applied to a positive feature (pin/boss) or to a negative feature (a hole). When Perpendicularity is referenced for axial control of a feature, the symbol now specifies a cylindrical boundary where the axis of the referenced feature must lie.

When perpendicularity is applied to a plane surface the tolerance zone is two?

When perpendicularity is applied to a planar surface, what conditions apply? 1. The tolerance zone is two parallel lines.

When applied to the surface perpendicularity tolerance can be measured in which of the following ways?

Surface: Perpendicularity is measured using a height gauge, similar to flatness, however, the gauge (or part) is locked to a 90° datum to measure how perpendicular the surface is. The entire surface has to be measured if it is a flat feature.

When perpendicularity is applied to a planar surface the tolerance zone?

When applied to a planar surface What does perpendicularity control?

When controlling a surface, the perpendicularity control (b) defines how much a surface may deviate from a right angle (90o) with respect to an identified datum (a perfectly flat plane).

When perpendicularity is applied to a planar surface?

To apply a perpendicularity control to a surface, the FCF may point to the surface or be attached to the extension line that extends from the surface. The FCF’s shown below apply a perpendicularity tolerance to the entire surface. The entire surface must lie between two parallel planes that are 0.1 mm apart.