[PPT]Geometric Dimensioning and Tolerancing · Web viewEveryone should have a workbook to follow...
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Transcript of [PPT]Geometric Dimensioning and Tolerancing · Web viewEveryone should have a workbook to follow...
![Page 1: [PPT]Geometric Dimensioning and Tolerancing · Web viewEveryone should have a workbook to follow along. It contains necessary reference information along with class exercises. Page](https://reader035.fdocuments.in/reader035/viewer/2022081605/5ae69a1d7f8b9a29048db970/html5/thumbnails/1.jpg)
Geometric Dimensioning and Tolerancing
Unit 1 – Introduction, Symbols, and Terms
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EML 2023Computer Aided Design 2
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EML 2023Computer Aided Design
Everyone should have a workbook to follow along.
It contains necessary reference information along with class exercises.
Page numbers in yellow on the slides match pages in the workbook.
Geometric Tolerancing Workbook
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EML 2023Computer Aided Design
Eli Whitney, is the inventor of the cotton gin and a pioneer in the use of mass production methods.
Around 1798, he won a contract to supply muskets to the United States government. The firearms manufacture were based on the concept of interchangeable parts.
He made a presentation to congress by building 10 guns and assembling and disassembling them claiming the same exact parts and mechanisms.
Eli Whitney 1765 - 1825
History and Background
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EML 2023Computer Aided Design
Tolerances
• All dimensions require a tolerance.
• A tolerance should be as large as possible without interfering with the function of the part to minimize production costs.
• Consider how your part will be checked to see if it meets the tolerances.
5
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EML 2023Computer Aided Design
Tolerance Notes
6
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EML 2023Computer Aided Design
Limit Tolerancing
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EML 2023Computer Aided Design
Limit Tolerancing
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EML 2023Computer Aided Design
Limit Tolerancing
• Is the .620-.630 hole horizontal position measured from a true vertical plane or from the as built face?
• A .005” tolerance on the horizontal and vertical position of the hole means that the position could be off by as much as .007”.
+.005
+.005
.007
perfect locationfor hole center
max allowed errorfor hole center
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EML 2023Computer Aided Design
Limit Tolerancing
• Limit tolerances don’t have an origin or any orientation or location relative to datums.
• The datums are usually implied.
• The drawings are subject to different interpretations.
• Plus/minus tolerancing works well for individual features of size (ex. diameter of a shaft), but does not control the relationship between individual features very well.
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EML 2023Computer Aided Design
Mil Std 8 1950’sMil Std 8AMil Std 8B
Mil Std 8C-1963ASA-Y14.5-1957
USASI Y14.5-1966ANSI Y14.5-1973
ANSI Y14.5M-1982ASME Y14.5M-1994ASME Y14.5-2009
1.3
History of Dimensioning and Tolerancing Standards in the USA
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EML 2023Computer Aided Design
Introduction
• GDT is a language of symbols
• We will see an overview of the symbols associated with:1. Dimensioning Symbols2. Geometric Characteristics3. Modifying Symbols
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EML 2023Computer Aided Design
Dimensioning Symbols
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EML 2023Computer Aided Design
Dimensioning Symbols
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Diameter Radius R
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EML 2023Computer Aided Design
Dimensioning Symbols
15
Spherical Diameter S Spherical Radius SR
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EML 2023Computer Aided Design
Dimensioning Symbols
16
Controlled Radius Tolerance CR Number of Places
A controlled radius has no ‘reversals’, but is a smooth curve within the tolerance zone.
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EML 2023Computer Aided Design
Dimensioning Symbols
17
Counterbore/Spotface Countersink
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EML 2023Computer Aided Design
Dimensioning Symbols
18
Depth/Deep Dimensions Not to Scale
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EML 2023Computer Aided Design
Dimensioning Symbols
19
Conical taper Slope
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EML 2023Computer Aided Design
Dimensioning Symbols
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Square Reference Dimension
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EML 2023Computer Aided Design
Dimensioning Symbols
21
Dimension Origin Arc Length
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EML 2023Computer Aided Design
Dimensioning Symbols
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All Around All Over
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EML 2023Computer Aided Design
Dimensioning Symbols
23
Chain Line
Used to identify a limited region to be treated differently from the rest of the part.
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EML 2023Computer Aided Design
Introduction
• We will see an overview of the symbols associated with:1. Dimensioning Symbols2. Geometric Characteristics3. Modifying Symbols
24
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EML 2023Computer Aided Design
Geometric Characteristics
25
Explained in detail in Chapters 6 and 8.
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EML 2023Computer Aided Design
Introduction
• We will see an overview of the symbols associated with:1. Dimensioning Symbols2. Geometric Characteristics3. Modifying Symbols
26
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EML 2023Computer Aided Design
Modifying Symbols
27
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EML 2023Computer Aided Design
Modifying Symbols
28
Maximum Material ConditionMMC
MMC
Refers to the size of the feature associated with the most material.
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EML 2023Computer Aided Design
Modifying Symbols
29
Least Material ConditionLMC
LMC
Refers to the size of the feature associated with the least material.
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EML 2023Computer Aided Design
Modifying Symbols
30
Continuous Feature Basic Dimension
Used to describe a theoretically exact size.
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EML 2023Computer Aided Design
Modifying Symbols
31
Between
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EML 2023Computer Aided Design
Geometric Dimensioning and Tolerancing (GDT)
1. establish a reference coordinate system by defining datums
2. provide basic dimensions (perfect dimensions) relative to the datums
3. specify allowable tolerances
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Common Symbols applied to a Drawing
1.8
±1°
18
25
10
units are mm
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EML 2023Computer Aided Design
Indexer Assembly
1.17
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EML 2023Computer Aided Design1.17
Indexer Plate
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1.23
Workshop Exercise 1.1
12
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