basic geometrical dimensioning & tolerancing tranning
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GD&T: An International Language
GD&T: An Exact Language
GD&T Provides Uniformity
GD&T stands for Geometric Dimensioning and Tolerancing, as defined by ASME Y14.5M-1994.
GD&T: An International Language Geometric dimensioning and tolerancing is an international language used on drawings to accurately describe a part. The language consists of a well-defined set of symbols, rules, definitions, and conventions that can be used to describe the size, form, orientation, and location tolerances of part features.
GD&T: An Exact Language Geometric tolerancing is an exact language that enables designers to “say what they mean” on a drawing, thus improving product designs. Production uses the language to interpret the design intent, and inspection looks to the language to determine set up.
GD&T Provides Uniformity By providing uniformity in drawing specifications and interpretation, GD&T reduces controversy, guesswork, and assumptions throughout the manufacturing and inspection process.
(Based on ASME Y14.5M-1994)
Provide Participants with Fundamental concepts of GDnT
Enable Participants to express, understand and interpret drawing requirements using GDnT to ANSI / ASME Y14.5M Stdandards.
(Based on ASME Y14.5M-1994)
ASME, American Society of Mechanical Engineers.Founded in 1880 by Alexander Lyman Holley, Henry Rossiter Worthington, John Edison Sweet and Matthias N. Forneyin response to numerous steam boiler pressure vessel failures. ASME is an engineering society focused on mechanical engineering in North America, is thus a standards organization, a research and development organization, a provider of training and education, and a nonprofit organization.
- A document that communicates a precise description of a part.- This description consists of pictures, words, numbers, and symbols.
Day 1 The Definitions Datums
Datum feature system (planar datum) Datum Feature Simulator, Datum targets
Dimension Basic and Reference, Using Basic Dimension
Envelop, actual mating Feature
Control frame, axis Of, Center of Plane, SizeFIM, MMC, LMC,RFS Conditions
Size Actual, Nominal & Virtual Tolerance of Position Controls
Bilateral, Geometric, Unilateral, of positionTrue Geometric Counterpart
(Based on ASME Y14.5M-1994)
Day 2 Fundamental Rules Dimensioning & Tolerancing
Selection & arrangement to suit Function and mating relationship
Rule #1 and Rule #2 Basic dimensions, virtual condition, bonus tolerance
Position Controls
Concentricity, Symmetry
Profile ControlsProfile tolerancing Profile of a surface Profile of a line
Workshop Drawing Interpretation Presentation Q & A Discussion
Closing comments
The definitions
Datum Feature Simulator - The inspection equipment (or gage surfaces) used to establish a datum.
Datum Reference Frame - A set of three mutually perpendicular datum planes.
Datum Shift - The allowable movement, or looseness, between the part datum feature and the gage.
Datum System - A set of symbols and rules that communicate to the drawing user how dimensional measurements are to be made.
Datum - A theoretically exact plane, point or axis from which a dimensional measurement is made.
Datum Feature - A part feature that contacts a datum.
Datum Target - A symbol that describes the shape, size, and location of gage elements that are used to establish datum planes or axes.
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 - A double ended arrow that indicates the tolerance zone extends to include multiple surfaces.
Dimension - A numerical value expressed in appropriate units of measure and used to define the size, location, orientation, form, or other geometric characteristics of a part.
.
Feature - A general term applied to a physical portion of a part, such as a surface, hole, or slot.
Feature Control Frame - A rectangular box that is divided into compartments within which the geometric characteristic symbol, tolerance value, modifiers, and datum references are placed
Feature of Size - One cylindrical or spherical surface, or a set of two opposed elements or opposed parallel surfaces, associated with a size dimension.Feature of Size Dimension - A dimension that is associated with a feature of size.
Datum New Activities
You!
End of Day 1
Review Day 1, The Definitions Datums
Datum feature system (planar datums) Datum Feature Simulator, Datum targets
Dimension Basic and Reference, Using Basic Dimension Envelop, actual mating Feature
Control frame, axis Of, Center of Plane, SizeFIM, MMC, LMC,RFS Conditions
Size Actual, Nominal & Virtual Tolerance of Position Controls
Bilateral, Geometric, Unilateral, of positionTrue Geometric Counterpart
Datum - A theoretically exact plane, point or axis from which a dimensional measurement is made.
Datum Feature - A part feature that contacts a datum.
Datum Target - A symbol that describes the shape, size, and location of gage elements that are used to establish datum planes or axes.
Datum Feature Simulator - The inspection equipment (or gage surfaces) used to establish a datum.
Datum Reference Frame - A set of three mutually perpendicular datum planes.
Datum Shift - The allowable movement, or looseness, between the part datum feature and the gage.
Datum System - A set of symbols and rules that communicate to the drawing user how dimensional measurements are to be made.
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 - A double ended arrow that indicates the tolerance zone extends to include multiple surfaces.
Dimension - A numerical value expressed in appropriate units of measure and used to define the size, location, orientation, form, or other geometric characteristics of a part.
.
Feature - A general term applied to a physical portion of a part, such as a surface, hole, or slot.
Feature Control Frame - A rectangular box that is divided into compartments within which the geometric characteristic symbol, tolerance value, modifiers, and datum references are placed
Feature of Size - One cylindrical or spherical surface, or a set of two opposed elements or opposed parallel surfaces, associated with a size dimension.Feature of Size Dimension - A dimension that is associated with a feature of size.
Day 2 Fundamental Rules Dimensioning & Tolerancing
Rule #1 and Rule #2 Basic dimensions
Profile Controls
Profile tolerancing
Workshop Drawing Interpretation
Presentation Q & A Discussion & Closing
comments
Dimensioning & Tolerancing
Selection & arrangement to suit Function and mating relationship
Rule #1 and Rule #2
Profile tolerancing Profile of a surface Profile of a line
Drawing Interpretation Presentation Q & A Discussion
You!
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