GEOMETRICAL DIMENSIONING & TOLERANCING (GD&T)

Runout

Fundamentals About Runout You Didn’t Learn in School.

RUNOUT A runout is basically a composite control. When the form, orientation and location of a part feature is controlled simultaneously then it is known as composite control. There are two runouts. Circular runout. Total runout. Let’s deep dive into circular runout. Datum axis establishment for Runout. The three ways to establish a datum axis …

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Symmetry

Why You Should Focus on Improving the Meaning of Symmetry.

SYMMETRY MEANING Meaning of symmetry is very much equivalent to concentricity. Concentricity is basically used on a surface of revolution while symmetry is used on a planar surface. DEFINTION The condition in which all the median points of two or more features are in the same axis or center plane of a datum feature. The …

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Concentricity

How Successful People Make the Most of Their Concentricity.

DEFINTION The condition in which the median points of all diametrically opposed elements of a cylinder come together with respect to the axis of the datum feature is known as concentricity. The midpoint of a two point measurement is known as a median point. A geometric tolerance that limits the concentricity error is known as …

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Parallelism

Become an Expert on Parallelism by Reading These 8 Topics.

IMPLIED PARALLELISM In a drawing, wherever two surfaces are shown to be parallel, the size dimension of the surfaces controls the parallelism. This method is satisfactory is some cases only but contains two short comings: Parallelism is the same value as the size dimension. No datum references. Implied Parallelism DEFINTION OF A PARALLELISM CONTROL The …

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Angularity

6 Topics About Angularity That Will Instantly Put You in a Good Mood.

DEFINTION When a surface, center plane, or axis is at a specified angle then this condition is known as Angularity. A geometric tolerance which helps in limiting the angle of variation of a surface, axis or center plane is known as Angularity control. ANGULARITY TOLERANCE ZONE The two common angularity tolerance zones are: Two parallel …

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Perpendicularity

The Perpendicularity Tolerance Case Study You’ll Never Forget.

IMPLIED RIGHT (90°) ANGLES OR PERPENDICULARITY The two lines are said to be implied 90° or contain perpendicularity when they are drawn at 90° on the drawing. The tolerance for the implied 90° is mostly present on the title or else in the notes section in some of the drawings. There are basically two short …

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Datum

9 Important Concepts About Datum From Industry Experts.

DATUM (AXIS OR CENTERPLANE) FOS DATUM FEATURES Specifying an Axis or center plane as a Datum. When there is a datum symbol on a FOS then the FOS is specified as a datum feature.An axis or center plane becomes a datum when the FOS is specified as a datum feature. There are 5 ways to …

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Datum Target

DATUM TARGET: Datum target symbols, Datum target points & Application

DATUM TARGET The symbols that describe the shape, size and location of gage elements that are used to establish datum planes or axes is called as Datum target. Datum target are not present on the part surface, but they are shown on the drawing. They typically describe the gage elements. The gage elements only contact …

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Gd&t

3-2-1 RULE,INCLINED & COPLANAR DATUM FEATURES.

3-2-1 RULE The 3-2-1 rule helps us in defining the number of points of a part feature which must come in contact of primary, secondary and tertiary datum planes. This rule is only applicable on planar datums. Primary datum feature has mainly 3 points of contact with the datum plane. Secondary datum feature has at …

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