# Intended Audience: This StAIR is intended for advanced second year students (10-12 grade) with a mechanical focus.Objective: Given the Applying GD&T StAIR.

## Presentation on theme: "Intended Audience: This StAIR is intended for advanced second year students (10-12 grade) with a mechanical focus.Objective: Given the Applying GD&T StAIR."— Presentation transcript:

Intended Audience: This StAIR is intended for advanced second year students (10-12 grade) with a mechanical focus.Objective: Given the Applying GD&T StAIR a student shall be able to apply Geometric Dimensioning & Tolerancing schema to existing models and prints. Based on ASME Y14.5M-1994 standard and aligned with CIP 15.1301 curriculum requirements. Intended Audience: This StAIR is intended for advanced second year students (10-12 grade) with a mechanical focus.Objective: Given the Applying GD&T StAIR a student shall be able to apply Geometric Dimensioning & Tolerancing schema to existing models and prints. Based on ASME Y14.5M-1994 standard and aligned with CIP 15.1301 curriculum requirements.

Purpose: Geometric Dimensioning & Tolerancing GD&T Today you will be reviewing both the Linear tolerancing scheme you have been exposed to as well as being introduced to a new form of tolerancing and begin applying it on our prints. That form of tolerancing is called Geometric Dimensioning & Tolerancing or simply GD&TPurpose:

Tolerance defined: The permissible range of variation in a dimension of an object. All manufacturing processes must allow for some variances in part geometry as it is impossible Two forms of Tolerancing: Please select one Please select one Tolerance defined: The permissible range of variation in a dimension of an object. All manufacturing processes must allow for some variances in part geometry as it is impossible Two forms of Tolerancing: Please select one Please select one LINEAR GD&T

Based on X&Y coordinates creating a rectangular tolerance zone for part position. Example of tolerance zone Example of tolerance zone TYPES OF LINEAR TOLERANCES: TYPES OF LINEAR TOLERANCES: Based on X&Y coordinates creating a rectangular tolerance zone for part position. Example of tolerance zone Example of tolerance zone TYPES OF LINEAR TOLERANCES: TYPES OF LINEAR TOLERANCES: BILATERAL UNILATERAL PLUS AND MINUS LIMIT

Tolerance dimension that allow variation in both direction from a basic dimension (+ and -). Does not need to be symmetrical EXAMPLE: EXAMPLE: Tolerance dimension that allow variation in both direction from a basic dimension (+ and -). Does not need to be symmetrical EXAMPLE: EXAMPLE:

Tolerance dimension that allow variation in only one direction from a basic dimension (+ or -). EXAMPLES: EXAMPLES: Tolerance dimension that allow variation in only one direction from a basic dimension (+ or -). EXAMPLES: EXAMPLES:

Tolerance dimension that used to indicate the tolerance range above and below the basic dimension. Must remain symmetrical EXAMPLE: EXAMPLE: Tolerance dimension that used to indicate the tolerance range above and below the basic dimension. Must remain symmetrical EXAMPLE: EXAMPLE:

A statement of the variations that can be permitted from a given dimension. Stating both the upper and lower limit of the dimension EXAMPLE: EXAMPLE: A statement of the variations that can be permitted from a given dimension. Stating both the upper and lower limit of the dimension EXAMPLE: EXAMPLE:

Based on an international standard for communicating instructions about the design and manufacturing of parts. GD&T uses universal symbols and emphasizes the function of the part. Culminating in increasing a manufactures ability to create parts based on form and providing them with a larger tolerance envelope. Tolerance zones GD&T VS Linear Tolerance zones GD&T VS Linear GD&T(ASME) Y14.5M-1994 GD&T(ASME) Y14.5M-1994 Based on an international standard for communicating instructions about the design and manufacturing of parts. GD&T uses universal symbols and emphasizes the function of the part. Culminating in increasing a manufactures ability to create parts based on form and providing them with a larger tolerance envelope. Tolerance zones GD&T VS Linear Tolerance zones GD&T VS Linear GD&T(ASME) Y14.5M-1994 GD&T(ASME) Y14.5M-1994

PURPOSE: The Y14.5M standard establishes uniform practices for stating and interpreting dimensioning, tolerancing, and related requirements for use on engineering drawings and in related documents. TO FURTHER INFORMATION TO QUIZ

GD&T Can be broken down into three major categories TYPES OF TOLERANCE TYPES OF TOLERANCE DATUM'S &FEATURE CONTROL FRAMES DATUM'S &FEATURE CONTROL FRAMES MODIFIERS

FORM PROFILE ORIENTATION LOCATION RUNOUT Geometric tolerances that limit the amount of error in the shape of a feature. Form tolerances are independent tolerances. Powerful geometric tolerances that control the size, location, orientation, and form of a feature. Profile tolerances can be either independent or related. Geometric tolerances that limit the direction, or orientation, of a feature in relation to other features. Orientation tolerances are related tolerances. Geometric tolerances that limit the location or placement of features. Location tolerances are related tolerances. Geometric tolerances that simultaneously limit the form, location, and orientation of cylindrical parts. Runout tolerances are related tolerances requiring a datum axis.

STRAIGHTNESS FLATNESS CIRCULARITY CYLINDICITY A two-dimensional geometric tolerance that controls how much a feature can deviate from a straight line. A three-dimensional geometric tolerance that controls how much a feature can deviate from a flat plane. A two-dimensional geometric tolerance that controls how much a feature can deviate from a perfect circle. A three-dimensional geometric tolerance that controls how much a feature can deviate from a perfect cylinder.

PROFILE OF A LINE PROFILE OF A LINE PROFILE OF A SURFACE PROFILE OF A SURFACE A two-dimensional geometric tolerance that controls how much the outline of a feature can deviate from the true profile. A three-dimensional geometric tolerance that controls how much a surface can deviate from the true profile.

ANGULARITY Perpendicularity Parallelism A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from the angle described in the design specifications. A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from a 90 degree angle. A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from an orientation parallel to the specified datum.

Positional tolerance Positional tolerance Symmetry Concentricity A three-dimensional geometric tolerance that controls how much the location of a feature can deviate from its true position. A three-dimensional geometric tolerance that controls how much the median points between two features may deviate from a specified axis or center plane. A three-dimensional geometric tolerance that controls how much the median points of multiple diameters may deviate from the specified datum axis.

CIRCULAR RUNOUT CIRCULAR RUNOUT TOTAL RUNOUT A two-dimensional geometric tolerance that controls the form, orientation, and location of multiple cross sections of a cylindrical part as it rotates. A three-dimensional geometric tolerance that controls the form, orientation, and location of the entire length of a cylindrical part as it rotates.

FEATURE A physical feature of a part that naturally contains variation and imperfections. A corner, edge, flat surface, or hole are all examples of possible features. FEATURE CONTROL FRAME FEATURE CONTROL FRAME A series of compartments containing symbols and values that describe the tolerance of a feature. The order and purpose of these compartments follow a consistent standard. DATUM'S An imaginary, perfect geometric shape or form. A perfect point, line, flat plane, circle, or cylinder are all examples of possible datums. DATUM FEATURE A physical feature that acts as an acceptable substitute for a datum. Datum features relate the various features of the part to each other. DATUM REFERENCE FRAME DATUM REFERENCE FRAME Three imaginary planes perpendicular to one another that are mapped onto the part to relate features to each other.

Straightness tolerance applied to axis:What is means:

FLATNESS CALLED OUT WHAT IS ACTUALLY MEANS

Tolerance applied to cylinder Implied Meaning:

Tolerance applied Implied Meaning

Applied to a print What it implies

Applied to a print What it implies

ALL AROUND SYMBOL ALL AROUND SYMBOL A circle placed on the bend of the leader line of a profile control. BASIC DIMENSION BASIC DIMENSION A numerical value used to describe the theoretically exact size, true profile, orientation, or location of a feature or datum target. BETWEEN SYMBOL BETWEEN SYMBOL A double ended arrow that indicates the tolerance zone extends to include multiple surfaces. CONTROL RADIUS CONTROL RADIUS A radius with no flats or reversals allowed. The symbol for a controlled radius is "CR." LEAST MATERIAL CONDITION LEAST MATERIAL CONDITION The condition in which a feature of size contains the least amount of material everywhere within the stated limits of size. MAXIMUM MATERIAL CONDITION MAXIMUM MATERIAL CONDITION The condition in which a feature of size contains the maximum amount of material everywhere within the stated limits of size. PROJECTED TOLERANCE ZONE PROJECTED TOLERANCE ZONE A tolerance zone that is projected above the part surface. RADIUS A straight line extending from the center of an arc or circle to its surface.

CONCENTRICITY IS A FORM TOLERANCE Concentricity FALSE TRUE

LOCATION TOLERANCE Concentricity A three-dimensional geometric tolerance that controls how much the median points of multiple diameters may deviate from the specified datum axis. NEXT QUESTION

OOPS

TOTAL RUNOUT A two-dimensional geometric tolerance that controls the form, orientation, and location of multiple cross sections of a cylindrical part as it rotates. FALSE TRUE

GOOD WORK NEXT QUESTION TOTAL RUNOUT A three-dimensional geometric tolerance that controls the form, orientation, and location of the entire length of a cylindrical part as it rotates.

NO YES Parallelism A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from a 90 degree angle. IS THIS THE CORRECT DEFINITION

GOOD WORK NEXT QUESTION Parallelism A three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from an orientation parallel to the specified datum.

FALSE TRUE GD&T PROVIDES A DESIGNER AN IMPROVEMENT IN THE USEABLE TOLERANCE ZONE OF 52%

57% INCREASE NEXT QUESTION

NO YES PROFILE OF A SURFACE PROFILE OF A SURFACE A two-dimensional geometric tolerance that controls how much the outline of a feature can deviate from the true profile. IS THIS CORRECTLY DEFINED

GOOD NEXT QUESTION PROFILE OF A SURFACE PROFILE OF A SURFACE A three-dimensional geometric tolerance that controls how much a surface can deviate from the true profile.

FALSE TRUE THIS IS AN EXAMPLE OF A DATUM REFERENCE FRAME

ALMOST DONE NEXT QUESTION FEATURE CONTROL FRAME FEATURE CONTROL FRAME A series of compartments containing symbols and values that describe the tolerance of a feature. The order and purpose of these compartments follow a consistent standard.

FALSE TRUE CIRCULARITY IS THIS THE CORRECT SYMBOL FOR CIRCULARITY

GETTING CLOSE NEXT QUESTION CIRCULARITY A two-dimensional geometric tolerance that controls how much a feature can deviate from a perfect circle.

NO YES DATUM'S An imaginary, perfect geometric shape or form. A perfect point, line, flat plane, circle, or cylinder are all examples of possible datums. IS THIS CORRECTLY DEFINED

NICE NEXT QUESTION

NO YES STRAIGHTNESS A two-dimensional geometric tolerance that controls how much a feature can deviate from a straight line. IS THIS THE CORRECT SYMBOL FOR STRAIGHTNESS

NICE WORK NEXT QUESTION STRAIGHTNESS A two-dimensional geometric tolerance that controls how much a feature can deviate from a straight line.

FALSE TRUE FORM TOLERANCES ARE INDEPENDENT FROM OTHER FEATURES.

CONGRATULATIONS PLEASE SEE THE INSTRUCTOR FOR YOU FIRST ASSIGNMENT CONGRATULATIONS FINISH

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