TOLERANCE ZONE SHAPES IN GD&T

Sreelakshmy V.U

FEATURE CONTROL FRAME

HOW TOLERANCE ZONE GOT DERIVED

Earlier the tolerance zone was SQUARE in shape. So, rejections were high during the inspection (mass production). To avoid rejections, the tolerance zone was revised to CIRCLE shape.

FORM TOLERANCES

STRAIGHTNESS

PARALLEL LINES ARE THE TOLERANCE ZONE FOR THE ABOVE TWO CONDITIONS

FLATNESS & PARALLELISM

NO DATUM (REFERENCE) IS THERE FOR FLATNESS BUT FOR PARALLELISM DATUM (REFERENCE) IS CONSIDERED

CIRCULARITY

CYLINDRICITY

ORIENTATION TOLERANCE

ANGULARITY

PERPENDICULARITY

LOCATION TOLERANCE

POSITION

CONCENTRICITY

Tolerance zone is TWO CO-AXIAL CYLINDER. It controls the axis of two concentric circles

SYMMETRY

PROFILE TOLERANCE

PROFILE OF LINE

PROFILE OF SURFACE

RUN OUT TOLERANCE

CIRCULAR RUN OUT

Tolerance zone is two concentric circles

TOTAL RUN OUT

Tolerance zone is two coaxial cylinder

THANK YOU (Referred from concerned website)