ME9 Engineering Graphics and Design CAD Assignment 2 OBJECTIVES • To continue developing an understanding of the SolidWorks user interface. • To further develop solid modeling techniques by creating extruded boss base features and extruded cuts. INTRODUCTION SolidWorks Base Features Solid models are created from a collection of features. Features are the protrusions and cuts used to shape a model. The base feature is the first feature created for a part, usually a protrusion. The first step in creating a solid model involves determining the shape that will be used as the base feature. The base feature should describe the overall shape of the part and usually provides the greatest amount of detail that can be generated with a single extrusion or rotation of a 2D sketch. 2D Sketch Figure 1. Base feature generated by extruding a 2D sketch. (Reference Lieu & Sorby, Fig. 5.17) The 2D sketch used to create the base feature is called a profile. The profile must form a closed loop. Sketches with extra or overlapping entities (lines, arcs, circles) that do not form a closed region will generate an error when the region is extruded or revolved because the software cannot determine the boundaries of the solid. Examples of proper and improper profiles are shown in Figure 2. In the following exercises, students will practice creating base feature extrusions and cuts using proper 2D sketches. Rev 10/7/2022 Sheet 1 of 4 ME009 Engineering Graphics and Design CAD Assignment 2 Figure 2. Proper and improper 2D sketch profiles. (Reference Lieu & Sorby, Fig. 5.16) ASSIGNMENT In the following exercises, you will create SolidWorks part models. At the end of each lesson, you will save your model as a SolidWorks part file (.SLDPRT) and a screenshot image as a PDF file. Specific instructions regarding how to save the files are provided in each lesson. After completing the exercises, you will submit seven PDF files (save, but do not submit the SolidWorks files). Access the CAD Assignment 2 submission link on Canvas to submit your PDF files. PART A As an introductory exercise, the SolidWorks Tutorial “Lesson 1: Parts” will guide you through the creation of the part shown below. 1. Start SolidWorks, click Help → SolidWorks Tutorials → Getting Started → Lesson 1: Parts. 2. Follow the steps in the tutorial to complete the model of the part. Save the file in your ME9 folder. Rev 10/7/2022 Sheet 2 of 4 ME009 Engineering Graphics and Design CAD Assignment 2 3. Add your name and "ME9 CAD 2 Part A" to the part (Insert →Annotations → Note…): 4. Save an isometric view as a PDF. Name the file ME9 CAD 2 Part A, Lastname and save it in your ME9 folder. PART B Create solid models for each of the following six parts in SolidWorks (create six separate part files). • Each model can be created with one extruded boss (base feature) and no more than one extruded cut (some may only require a single extrusion). • Be sure your profile sketches are completely defined and dimensioned correctly. • Add your name and part description to each part as shown in the example below. • Save each part in your ME9 folder with a file name ME9 CAD 2 Part B-X, Lastname where X is the corresponding part number. • Save an isometric view of each part as a PDF. Name the PDF file ME9 CAD 2 Part B-X, Lastname and save it in your ME9 folder. Example: Rev 10/7/2022 Sheet 3 of 4 ME009 Engineering Graphics and Design Part B-1 Dimensions in inches. Part B-3 Dimensions in inches. Rev 10/7/2022 Part B-2 Dimensions in inches. Part B-4 Dimensions in inches. Part B-5 Dimensions in inches. CAD Assignment 2 Part B-6 Dimensions in millimeters. Sheet 4 of 4
