Transcript 21-dimensioning-more

Design Project
8.30 – 9.30 Project work (meeting)
Assign a rapporteur
Search in internet, patents and standards about
 bike types, size and design parameters
height and weight ranges
 child’s
capacity ??
 maximum
regulations about carrying people
 the
 safety requirements
Prepare the meeting minutes
MAK112E Computer Aided Technical Drawing
Dr C Erdem IMRAK @ 2011
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Design Project - Minutes
Design group name
Meeting minutes
Date :
Time :
Meeting room :
Participants :
1.
2.
3.
Subject & decisions
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3. Principles of Dimensioning
This week you will learn dimensioning . The
steps to follow are:
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Functional & Non-functional Dimensions
Principles of Dimensioning
Dimension Placement & Conventions
Dimension Tolerances
Geometric Dimensioning &
Tolerancing
Assignment #2
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3. Principles of Dimensioning
What is dimension ?
Dimensions are defined as numerical values expressed
in appropriate units of measure and indicated on a
drawing and in other documents.
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3. Principles of Dimensioning
FUNCTIONAL DIMENSIONS
Functional dimensions directly affect the function or working of a
product and may be of the size or location types.
A datum is a reference line on the drawing from which a
component is dimensioned. In practice, a datum is any
functional surface or axis used for manufacture, inspection,
location, or assembly purposes.
NON-FUNCTIONAL DIMENSIONS
Non-functional dimensions, NF in Figure, are those dimensions
which are used for production purposes but which do not
directly affect the function or working of a product. Nonfunctional dimensions usually are not inspected.
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3. Principles of Dimensioning
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3. Principles of Dimensioning
PRINCIPLES OF DIMENSIONING
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Dimensions are normally expressed in millimeters.
Dimensions of less than unity should be preceded by zero
Each dimension should appear only once
It should not be repeated on other views.
Dimensions relative to a particular feature should be placed in
one view, which shows the relevant features most clearly,
rather than spread over several views.
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3. Principles of Dimensioning
AUTOMATIC DIMENSIONING
Some more powerful CADD systems allow dimensions to be added
automatically to a drawing. In a drawing made by hand, there is
no necessary or inherent correspondence between the
dimensions of the drawn outline and the intended dimensions of
the object, which it represents, until a scale has been specified.
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3. Principles of Dimensioning
Dimensioning Concept
CADD software such as AutoCAD provides three basic types of
dimensioning: linear (horizontal, vertical, aligned, rotated,
ordinate, baseline and continued), radial and angular.
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3. Principles of Dimensioning
Dimensioning System Variables
The dimensioning system variables control the appearance of
dimensions. You may set these variables on the command line
Variable
Dimasz
Dimgap
Dimexe
Dimexo
Dimdli
Dimrnd
Value
<2.5>
<1.5>
<2.0>
<0>
<10>
<0>
Explanation
.
Controls the size of the dimension arrowhead
Sets the distance around the dimension text above its line
Determines how far to extend the extension line
Determines how far extension lines offset from origin point
Sets the distance between adjacent dimension lines
Rounding dimension text value
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3. Principles of Dimensioning
Arrowheads
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3. Principles of Dimensioning
Special Characters
Diameter
Degree
Plus/minus
%%C
%%D
%%P
Ø
°
±
%%C 50
50 %%D
50 %%P 2
MAK112E Computer Aided Technical Drawing
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Ø 50
50 °
50 ± 2
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3. Principles of Dimensioning
Text Justification
Centered
Above
Aligned & Centered
Above
Outside
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3. Principles of Dimensioning
Text Fitting
Rounding off
Dimensions
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3. Principles of Dimensioning
DIMENSION TOLERANCES
Tolerance is the total amount
that a specific dimension is
permitted to vary; it is the
difference between the maximum
and minimum limits for the
dimension. Tolerances can be
applied directly to dimensioned
features, using limit dimensioning.
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Dimensioning in AutoCAD
Before setting
dimension
style, format
Text Style
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
To set the
dimension
varialbes
open
Dimension
Style …
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Dimensioning in AutoCAD
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Move the mouse on the icon bar
Move right click
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Dimensioning in AutoCAD
Leader
Aligned
Radial
Angular
Continous
Parallel
Linear
Diameter
Horizonral / vertical
Baseline
Geometric
Dim text
tolerance
Position
edit
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Dimension
style dialog
box
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3. Principles of Dimensioning
Geometric Dimensioning & Tolerancing
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3. Principles of Dimensioning
Geometric Dimensioning & Tolerancing
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3. Principles of Dimensioning
Basic Dimensions
Basic dimensions are the theoretical sizes from which limits of size
are derived by the application of allowances and tolerances.
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4. Principles of Dimensioning
Linear Dimensions
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3. Principles of Dimensioning
Chain Dimensions
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3. Principles of Dimensioning
Chain Dimensions
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3. Principles of Dimensioning
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3. Principles of Dimensioning
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3. Principles of Dimensioning
Radial Dimensioning
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3. Principles of Dimensioning
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3. Principles of Dimensioning
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3. Principles of Dimensioning
Radial Dimensioning
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3. Principles of Dimensioning
Angular Dimensioning
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3. Principles of Dimensioning
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3. Principles of Dimensioning
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Example
1st Select icon
2nd Select
point
+
4th point
here
3rd Select
point
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Example
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3. Principles of Dimensioning
Next Week ;
You will learn multi-view projection. The steps
to follow are:
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Projections (ISO-E & ISO-A)
Multi-view drawings
Projection views (Auxiliary, Detailed etc.)
Sketching 2-D Geometry
Assignment # 3
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3. Principles of Dimensioning
Assignment # 2
page : 118
Figure : 76 & 77
You will sketch and complete
views
Submit the assignment
on time
Load file into NINOVA
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3. Principles of Dimensioning
Assignment Procedure
Open MAK112E-Temp template file
Format the drawing file (linetype etc)
Sketch the front view
Complete the top view and the side view
Fill in the title block (name, number, date etc)
Save your (i.e. 301001A2.dwg)
Load the file into NINOVA
MAK112E Computer Aided Technical Drawing
Dr C Erdem IMRAK @ 2011
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