Create and Combine Area (Region) Lecture Three 1 Create and Combine Area (Region) Drawing Pattern by Hatch 2 Creating Principal Three Views 3 4 Drawing Sectional Views Making and Inserting a simple Block 5 Creating Isometric Drawing 6

1. Create and Combine an Area (Region) Region is a two-dimensional enclosed area solid. You can create the closed loop solid that is made of lines, polylines, circles, arcs, ellipses, elliptical arcs, and splines by suing Region Command. The object shown in fig.1 is made of four lines and four arcs. These lines and arc have not common endpoint. They are eight individual objects. Fig.1 Fig.2 is a enclosed area solid object and is a closed loop That is made of lines and arcs by Region Command. Regions can be used for Applying hatching and shading Analyzing properties, such as area, using MASSPROP Extracting design information, such as the centroid or center of gravity Fig.2

2. Drawing Pattern by Hatch a. Click Draw menu Hatch or . In your drawing, specify a point inside each area or pick up the area boundary that you want hatched, and then press ENTER. This point is known as the internal point. c. In the Hatch and Gradient dialog box, Hatch tab, in the swatch box, verify that the sample pattern is the pattern you want to use. To change patterns, select another pattern from the Pattern list. To see how the hatch pattern will look, click the [...] button next to Pattern. Click OK when you finish previewing. d. You can also define a simple line pattern using the current linetype replacing predefined hatch pattern. f. Click OK.

3. Creating Principal ThreeViews The principal views consists of Front, Bottom and Left in our national standard. We can create a principal three views by using Layer, Line type, Polyline, Osnap, Ploar, Otrack and other modifies fanction.

4. Creating Sectional Views We can create sectional views by using Layer, Line type, Polyline, Spline, Hatch, Osnap, Ploar, Otrack and other modifies fanction.

5. Making and Inserting a simple Block A block is one or more objects combined to create a single object. Blocks help you reuse objects in the same drawing or in other drawings.

How Blocks Are Stored and Referenced Every drawing file has an invisible data area called the block definition table. The block definition table stores all block definitions. It is these block definitions that are referenced when you insert blocks in your drawing. The following illustrations are conceptual representations of three drawing files. Each rectangle represents a separate drawing file and is divided into two parts: the smaller part represents the block definition table, and the larger part represents the objects in a drawing. When you insert a block, you are inserting a block reference. The information is not simply copied from the block definition to the drawing area. Instead, a link is established between the block reference and the block definition. Therefore, if the block definition is changed, all references are updated automatically.

Creating a block definition within a drawing The block definition in the illustration comprises a name, four lines, and a base point at the intersection of the two diagonal lines. We can create it using BLOCK command. The illustration shows a typical sequence for creating a block definition within a drawing.

Insert Blocks When you insert a block, you create a block reference. You can determine its location, scale factor, and rotation angle. You can specify the scale of a block reference using different X, Y, and Z values. Inserting a block creates an object called a block reference because it references a block definition stored in your current drawing.

Making and Inserting a Outside Block We can make a outside block by Wblock command. The block is stored in hard disk as a draw file such as BTL.dwg. We can reuse BTL.dwg block by using Insert command in diffrence draw files.

Assembly Drawing by Blocks

6. Creating Isometric Drawing

Basic Drawing by Isometric

Application of three views and Isometric Draw

Exercises Three After Class Making your A3 template file including a surface roughness Block Creating a Title outside block (3) Creating a drawing according to the dimensions

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