CPE315 CAD PDF

CPE315 "CAD" - A wireframe model is a **REAL-WORLD** 3D object represented by lines, circles, arcs, and/or plines located along the edge of the model. - A **MODEL** is the 3-dimensional object drawn at full size & located accurately in relation to X0Y0Z0 in the WCS. - A surface...

CPE315 "CAD" - A wireframe model is a **REAL-WORLD** 3D object represented by lines, circles, arcs, and/or plines located along the edge of the model. - A **MODEL** is the 3-dimensional object drawn at full size & located accurately in relation to X0Y0Z0 in the WCS. - A surface model is a 3D model with all its outer surfaces covered with a **THIN COATING**. - The **MESH DENSITY** represented by the lines, circles, or arc that make the rows & columns of the surface mesh are controlled with the system variables SURFTAB1 & SURFTAB2. - A **SOLID MODEL** is the best possible computerized representation of a real object. - **SUB** -- subtract - **REV** -- revolve - **TABSURF** -- tabular surface - **RULSURF** -- ruled surface - **BOX** -- box - **PRESSPULL** -- press pull - **ExT** -- extrude - **L** -- line - **3F** -- 3d face - **REG** -- region - **AutoCAD commands**: - Command: **3D ARRAY** Select Objects: Specify Opposite corner: Select object: - Enter the type of array \[Rectangular/**POLLAR**\]\ Rotate arrayed objects? \[Yes/No\]\ Specify center point of array: - Specify the **ANGLE** to fill (+=ccw,-=cw)\ Rotate arrayed objects? \[Yes/No}\ Specify center point of array: - Specify second point on **AXIS** of rotation - **Command: REVSURF:** - **Select Object** - Select Object that defines the axis of **REVOLUTION**: - Specify start **AXIS** \ Specify included angle (+=ccw,-=ccw)\ - **F** -- region is a 3D surface created using a closed polyline, circle, ellipse, or spline as the boundary. Each region must lie on one plane. - **T** -- The 3DMESH command is used to create an irregular complex surface mesh. It is created from XYZ coordinates created on an XY mesh. - **F** -- when using RULESURF command, ensure that you select the objects closest to matching ends. If opposite ends are selected, the mesh will flatten. - **3D Solid Primitives:** - **INPUT** -- materials used in order for your system to be achieved. - **BLOCK DIAGRAM** -- a simplified diagram of a system programs or process. - **FLOWCHART** -- this is type of diagram that represents an algorithm, workflow, or process. - - **GENERALIZATION** -- a leading relationship between blocks in which a designated block diagram. - **PROCESS** -- a series of actions or steps taken in order to achieve a particular end. - **Different Symbol of Flowchart** - **Tips for making a Block Diagram:** - - Study & understand the system firsthand - Design & mark the diagram - Show the input & output - Accuracy verification - **Limitations of Flowcharts:** - Complex - Costly - Difficult to modify - No update - Flowchart symbols have an entry point on the top of the symbols with no other entry points. The exit point for all flowchart symbols is on the bottom except for the **DECISION.** - All boxes of the **FLOWCHART** relate to Arrows. - Blocks can be placed **VERTICALLY & HORIZONTALLY.** - Blocks are normally constructed as **SQUARES** with proportions of 1:1 or rectangles with proportions of 2:1 - **FLOWCHART SYMBOLS** have an entry point on the top of the symbol with no other entry points. - **LOGIC GATES --** are switches that turn ON and OFF depending on what the user is doing - **TYPES OF LOGIC GATES --** NOT, AND, OR And XOR. - **NOT --** the simplest logic: - **AND --** it only turns on when both inputs are ON - **OR --** needs one input to be ON for it to spit out ON.  - **XOR --** only needs one input to be ON for it to spit out ON.  - **IC's:** - **ANALOGUE ELECTRONICS:** - Resistor - Capacitor - Inductor - Diode - Transistor - Relays - OP -- Amps - **ELECTRONICS SYMBOLS "INTERNATIONAL STANDARS-** is a pictogram used to represent various electrical and electronics devices or functions such as wires, batteries, resistors, and transistors, in a schematic diagram of an electrical circuit - **INTERNATIONAL ELECTROTECHNICAL COMISSION (IEC) --** 60617 "as British Standard/BS 3939. IEC 61131-3 -- for ladder-logic symbols. - - **JOINT INDUSTRIAL COUNCIL (JIC) --** as approved & adopted by the "National Machine Tool Builders Association (NMTBA)" specification EGPI-1967 - **ANSI Y32.3-1975** -- also known as IEEE std 315-1975 or CSA Z99-1975 - - **ELECTRICAL & ELECTRONICS ENGINEERS (IEEE)** -- Std 91/9a: graphic symbols for logic functions used in digital electronics. - **AUSTRALIAN STANDARD AS 1102** -- a slightly modified version of IEC 60617 - **SYMBOLS**:   **\ **