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Design Graphics Power Point Notes

by: Charles Lind

Design Graphics Power Point Notes MECH1072C

Marketplace > The University of Cincinnati > Engineering and Tech > MECH1072C > Design Graphics Power Point Notes
Charles Lind
GPA 3.2

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About this Document

Covers in class powerpoints including sketches definitions and descriptions
Engineering Design Graphics
Dr. Salehpour
Study Guide
Design Graphics
50 ?




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This 3 page Study Guide was uploaded by Charles Lind on Wednesday March 9, 2016. The Study Guide belongs to MECH1072C at The University of Cincinnati taught by Dr. Salehpour in Spring 2016. Since its upload, it has received 29 views. For similar materials see Engineering Design Graphics in Engineering and Tech at The University of Cincinnati.

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Date Created: 03/09/16
Engineering Design Graphics Tuesday, August 18, 2015 9:27 PM Technical Sketch: Creating a rough draft preliminary drawing representing the main FEATURES of a product! • Three ways ○ Free-Hand ○ Mechanical (Solid Works) ○ Digital (other) • Most common types of projects used in Technical Drawings are: ○ Multiview - different sketch views of same drawing. Front top, and right view o ○ Isometric - angles within the planes are 120  Axanometric - shown at an angle and faces aren't ruely shown ○ Oblique - cabinet making, front facing true size ○ Perspective - see things naturally, architecture for example • Used in the Ideation Stage • Rough technical sketch can help design idea quickly • Two most common grid papers used are: - Square grids - Isometricgrid • Pattern-seeking process of Human Mind: people look at illustrations differently Chapter 3: Engineering Geometry • Geometryprovides the building blocks for engineering design process Engineering geometry has to be referenced to a coordinate system in order to both define its form and to relate to other geometry • Coordinate Space: - Cartesian Coordinate System: X, Y, Z, Right-Hand Rule - Polar Coordinate: distance and an angle - Cylindrical Coordinate: one angle and two distances - Spherical Coordinate: two angles and a distance Quick Notes Page 1 Chapter 4: Modeling Fundamentals • Solid Modeling: It is a volumetric space information along with the informationabout the Surface of an object • It contains all of the wire frame and surface geometry necessary to fully describe the edges and faces of the model • Manifold Model • Non-Manifold Object: Highlighted edge belongs to 4 different faces • Constructive Solid Geometry(CSG):CSG modeling uses solid primitives that are related by Boolean operations Boolean Operations - Union: Joining two solids - Difference: Subtracting one solid from another - Intersection: Results in a solid that form by the overlapping of two solids ○ Order dependent to get resultant Exact: Round Cylinder Sphere Faceted: Octagonal pyramid or more faces Many faced spherical object • Constraint based modeling (Pro/Engineer): Models defined as a series of Modifiable Features • The geometry of each of these features is controlled through modifiable constraint (relations) • Creating a dynamic model that can be updated or change as the design requirements change Perspectiveline of sight • Solid modeling 3D Operations ○ Extrude ○ Rotate ○ Sweep ○ Loft Multi-views are standard method to represent a 3D object in design graphics • Use projection theory to represent 3D objects from 2D drawings. Orthographic. Only two of the objets dimmensions are show (2D) ○ Frontal Plane of Projection  Shows length ○ Horizontal Plane of Projection  Shares width with frontal view ○ Profile Plane of Projection  Usually shown I unison on the page  Depth shown • Projection Theory: Based on the variables Line of Sight (either point or parallel), and the Plane of projection  Line of sight - invisible line between an observers eye and the object. All starts at one point. For parallel projection all the Line of Sights are the same  Plane of Projectionis an imaginary plane of projection between the observer and object which the LOS pierce for it to be captured. • Projections - either perspective or parallel ○ Perspective - the oblique perspectivesalways show the front of the object and are true sized.  Autographic - isometric(angles and sides are the same), diametric (two angles and Quick Notes Page 2  Autographic - isometric(angles and sides are the same), diametric (two angles and two sides are the same), Trimetric (pictorial version of an autographic  Multi-views - Gives the principle views of the object. 1st angle projectionsuse the first quadrant whilst the 3rd angle projections use the 3rd quadrant 2-D sketches Purpose - To allow for the fabrication and manufacturing of a part or machine through the use of 2-d sketches. Auxiliary View - gives a view other then the box principle planes to show the object Line Types • Hidden Line- shows surfaces edges and planes • Center Line - show centers of surfaces and circles • Symmetry Line - - partial views of symmetricalparts are shown on a surface • Extension and Dimension Lines - shows where dimension of a sketch are in place, extensions show where an object was protruded • Leaders - lines going to a sketch point showing where it is • Break Lines - show where breaks in perspective of the object or where a fracture is • Cutting-plane - to dissect an imaginary piece where cutting takes place • Visible lines - are shown to make out objects and surfaces as well as planes • Section Lines - shows in partial perspective of what surfaces are part of a section. • Chain Line - shows how a circular object is represented in a sketch • Phantom Line - shows how the object may move in its desired performance Quick Notes Page 3


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