Measuring projector tolerances

Form tolerances -- refers to the amount allowed by the single change elements of the actual shape.

Shape tolerance zone -- is restricted to a single measured elements of change area, the actual elements of parts in the region for qualified. Contrary to the unqualified.

Element to be measured: linear, flat, circular and cylindrical surface.

Shape tolerance zone features: do not involve benchmark, direction and position it is floating, can only control the measured error of shape size

The amount allowed by the single elements of the actual shape changes.

The amount allowed by the single elements of the actual shape changes.

Form tolerances including straightness, flatness, roundness, cylindricity, line profile and surface profile.

Straightness symbol as a hyphen ( - ), is to limit the real line to an ideal linear variation of an index. It is based on the linear not straight and demands.

Flatness symbol is a parallelogram, is to limit the actual level of ideal plane and an index variable momentum. It is proposed for plane occurred uneven and requirements.

Circularity symbol is a circle ( zero), is to limit the actual circle on an index of ideal circle variation. It is to have a cylindrical surface ( including conical, spherical ) parts, in a section ( the vertical axis and the surface of the circular contour ).

Cylindricity symbol is two diagonal clamped a circle ( /, / ), is to limit the actual cylindrical face ideal cylindrical surface of an index variable momentum. It controls the shape error of cylindrical cross-section and axial section, such as roundness, hormone and axis straightness, etc.. Cylindricity is a comprehensive index of the shape error of the cylinder.

Line contour degree symbol as a convex curve ( -- ), is to limit the actual curve of the ideal curve variation of an index. It is the requirement of non-circular curve shape accuracy.

Profile of a symbol is a short-term will sign below the line profile of closed, is to limit the actual curved face a index variation of ideal surface. It is the requirements of the surface shape accuracy.