Design Project MAK112E Computer Aided Technical Drawing Dr C Erdem – 9.30 Project work (meeting) Search in internet, patents and standards about bike types, size and design parameters child’s height and weight ranges maximum capacity ?? the regulations about carrying people safety requirements Assign a rapporteur Prepare the meeting minutes     

Design Project - Minutes MAK112E Computer Aided Technical Drawing Dr C Erdem Design group name Meeting minutes Date : Time : Meeting room : Participants : Subject & decisions

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning This week you will learn dimensioning. The steps to follow are: Functional & Non-functional Dimensions Principles of Dimensioning Dimension Placement & Conventions Dimension Tolerances Geometric Dimensioning & Tolerancing Assignment #2

MAK112E Computer Aided Technical Drawing Dr C Erdem 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.

MAK112E Computer Aided Technical Drawing Dr C Erdem 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. Non- functional dimensions usually are not inspected.

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

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MAK112E Computer Aided Technical Drawing Dr C Erdem

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MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning PRINCIPLES OF DIMENSIONING 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.

MAK112E Computer Aided Technical Drawing Dr C Erdem 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.

MAK112E Computer Aided Technical Drawing Dr C Erdem 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.

MAK112E Computer Aided Technical Drawing Dr C Erdem 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 Value Explanation. Dimasz Controls the size of the dimension arrowhead Dimgap Sets the distance around the dimension text above its line Dimexe Determines how far to extend the extension line Dimexo Determines how far extension lines offset from origin point Dimdli Sets the distance between adjacent dimension lines Dimrnd Rounding dimension text value

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Arrowheads

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Special Characters Diameter %C Ø %C 50 Ø 50 Degree %D ° 50 %D 50 ° Plus/minus %P ± 50 %P 2 50 ± 2

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Text Justification Centered Above Aligned & Centered Above Outside

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Text Fitting Rounding off Dimensions

MAK112E Computer Aided Technical Drawing Dr C Erdem 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.

MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD Before setting dimension style, format Text Style

MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD

MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD To set the dimension varialbes open Dimension Style …

MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD

MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD

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MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD

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MAK112E Computer Aided Technical Drawing Dr C Erdem Move the mouse on the icon bar Move right click

MAK112E Computer Aided Technical Drawing Dr C Erdem

MAK112E Computer Aided Technical Drawing Dr C Erdem

MAK112E Computer Aided Technical Drawing Dr C Erdem Dimensioning in AutoCAD Linear Horizonral / vertical Aligned Radial Diameter Angular Parallel Baseline Continous Leader Dim text Position edit Dimension style dialog box Geometric tolerance

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Geometric Dimensioning & Tolerancing

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Geometric Dimensioning & Tolerancing  

MAK112E Computer Aided Technical Drawing Dr C Erdem 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.

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Linear Dimensions

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Chain Dimensions

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Chain Dimensions

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Radial Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Radial Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Angular Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning

MAK112E Computer Aided Technical Drawing Dr C Erdem Example 1st Select icon 2nd Select point 3rd Select point 4th point here +

MAK112E Computer Aided Technical Drawing Dr C Erdem Example

MAK112E Computer Aided Technical Drawing Dr C Erdem Principles of Dimensioning Next Week ; You will learn multi-view projection. The steps to follow are: Projections (ISO-E & ISO-A) Multi-view drawings Projection views (Auxiliary, Detailed etc.) Sketching 2-D Geometry Assignment # 3

MAK112E Computer Aided Technical Drawing Dr C Erdem 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

55 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 A2.dwg) Load the file into NINOVA   MAK112E Computer Aided Technical Drawing Dr C Erdem 2011