Special Problems

Practice identifying the correct surfaces on the image above:

Answers are given below:

Study the relationships between the surfaces shown in this figure.

For instance: 1) What type of surface is A.  2) What is the apx angle between each surface shown.  Can you identify the angles that are 90 degrees and the angles that are less than 90 degrees.  Are there any angles that are greater than 90 degrees in this figure?

SolidWorks BASIC Introduction

how to screen shot

Become familiar with the following terms.  The CommandManager contains most of the tools that you will need to create parts.  Sketch tools will be used in creating 2D sketches and Features tools will be used to create and modify 3D features.

The image below is from the text and it indicates the names of the various features that we will refer to during the upcoming lessons.  Be sure that you familiarize yourself with these terms and where they are located on the SolidWorks screen.

The image below will be the first thing you see after you press the icon indicated in the upper right corner of the initial screen.  I will post a series of links to videos that I have posted on YouTube showing all the proper steps to follow as indicated on the pages of the text that we are using in class.

SolidWorks Introduction Video


The information covered in the above video will take you to approximately page 7 in the text book.  While the next YouTube video will show you how to set some the program options and how to begin a sketch in SolidWorks 2014.


The information covered in this video Set Program options to begin sketch covers the material from page 8 in the text to about page 10.  It shows how to set some program options and how to begin a sketch in SolidWorks 2014.

Your first SolidWorks sketch    Drawing a circle on your first sketch  will show you how to change the grid that appears in the graphic area as you begin your sketch.  We will then choose a sketch tool and begin.  Two of the terms we will discuss in this YouTube video are "coincident relations" and "snap" . . . enjoy learning. 

Some more terms that we will discover in this YouTube video Under defined and fully defined dimensions   are "Under defined", "Fully defined",  Here will will fully define the circle, give it a diameter and learn how to edit a given dimension of an object on our sketch.

Oblique Surfaces

Oblique Surfaces and Edges - Definition Surfaces or lines that are positioned at an angle with respect to all the principal planes of projection are oblique. An oblique surface will never appear as an line or as a true size area in any of the principal views. It appears as a foreshortened area in each principal view. An oblique line will NEVER appear true length or as a point in a principal view. It will ALWAYS appear foreshortened.


To show an oblique surface true size, you would first have to draw an auxiliary view to show the edge view of the surface. A second auxiliary view that projects the edge view of that surface onto a plane parallel to it will show that surface true size.

  Reading Oblique Surfaces To identify oblique surfaces in given orthographic views, realize that the oblique surface will appear as an area in all principle views. The area must contain the same number of vertices in each view. Unlike the foreshortened views of inclined surfaces, the general shape of oblique surfaces need not maintain similarity of shape in the principal orthographic views.
When given two views of an object, it is usually easy to identify surfaces which match up vertex for vertex. If a surface is identified and the points are labeled, project it into the remaining view to see if in fact all vertices of the surfaces match up. Once the two views of the surface are identified and labeled, the points can easily be projected into the missing view.
If you look at the handout Orthographic Reading of Plane Surfaces, you will notice that inclined surfaces and oblique surfaces can appear as areas in two principal views. When reading a drawing, if you locate a surface that appears as an area in two views,you may not be able to determine immediately whether the surface is inclined or oblique. To make the determination, label the vertices of the surface in both given the two views then project into the missing view. Once this is accomplished, the type of surface will be obvious. If the surface is inclined, it will appear as a line in the missing view. If the surface is oblique, it will appear as an area.

Follow this link to a site on Oblique surface

The following group of pictures show how an oblique surface is different from an inclined surface in that there is not a view where the "slant" is represented by a line.  The angle between the top, front and right or profile projection planes IS LESS THAN 90 degrees, so it is not possible to appear as a line in any view.

Top view of Oblique surface

Right view of Oblique surface

Front view of Oblique surface

The following pictures show an isometric view of a solid block in addition to the front, top and right (or profile) views.  Notice how in all three views the oblique surface NEVER appears as a line, but ALWAYS appears as a "foreshortened" area.  I have added dimensions so you can keep track of the faces in the various views.

Isometric view of Oblique surface

    

Top View of Oblique surface

Right View of Oblique Surface

Front View of Oblique surface

Study the relationships between the surfaces shown

Video Exercise 1-10 Advanced Ortho Projection

This lesson is currently under construction.  Feel free to enjoy what is here so far.

Video Exercise 1-10 Advanced Orthographic Projection

Inclined Surfaces

INCLINED SURFACES

This is similar in format to the lesson on normal surfaces but because an inclined surface is a bit more than parallel or perpendicular to one another, I have included a few video clips via YouTube to help our understanding.

Follow this link to Inclined Surfaces in Orthographic Projection


Inclined Surfaces - Definition
Very few mechanical components are consist of only normal surfaces (flat, parallel and perpendicular only). We will continue to develop the visualization process of 3 dimensional solids with an introduction to inclined surfaces. Recall our definition of the three principal projection planes: frontal, horizontal, and profile.  Which we know as FRONT, TOP AND RIGHT.  An inclined surface is a surface that is perpendicular (OR AT A 90 DEGREE ANGLE) to one of the principal planes, and is at some angle to the remaining two principal planes. 

As such, an inclined surface will always appear as a line in one of the principal views and as a foreshortened area in the other two views. 

An inclined surface will NOT appear true size in a principal view. Following are a few examples of simple inclined surfaces and edges and how they appear in isometric and orthographic views.

Now before we continue - I want us to be certain that we know the difference between ISOMETRIC and ORTHOGRAPHIC views.

The image below left is an isometric view while the image below right is an orthographic view.
                                                                                                                 

Look at the following video clips to help with your understanding of this concept of inclined surfaces.

YouTube video Inclined surface example 1

YouTube video Inclined surface example 2

The following video clip is an explanation of the figure shown below.  While listening to the explanation visualize each of the greyed out areas as sheets of paper - while visualizing the lines shown with each grey area as the EDGES of that sheet viewed from the two directions that are perpendicular to direction which shows you the grey area.

Orthographic Reading of normal and inclined plane surfaces