# Chapter 7 Isometric Drawings

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1 Chapter 7 Isometric Drawings In this assignment, we are going to look at creating isometric drawings with AutoCAD. These drawing appear to be three dimensional but they are not. An AutoCAD isometric drawing is a 2 dimensional drawing just like a paper drawing. AutoCAD provides some tools to aid us in creating the drawing, but not very many. Mostly, we will be using the same commands that we used in creating orthographic drawings. We are going to draw the figure shown on the right. We will use the dimensions shown on the figure and make a drawing that is dimensionally correct as we have done in the past. We will start by drawing an isometric box that makes up the main body the object. From there, we will add the semicircular hole at the bottom and the half cylinder at the top. The first thing we need to do is to put AutoCAD in the isometric mode. This mode is entered through the SNAP command. SNAP ON/OFF/Rotate/Stype <1.000> S {Put into isometric mode} Standard/Isometric I Vertical Spacing <1.000>.4 SNAP ON/OFF/Snap OFF {Stop snapping to grid points} Now we can draw the left face the box. Use the LINE command and click on the lower right corner the right face the box. We will use polar coordinates to make the lines at 30 degree angles. LINE From Point: {Click on the screen where you want the object @5<330 To Point: To Point: To Point: To Point: C Start here Isometric Drawings in AutoCAD R Greenlee Page 1

2 Next draw the right face the box. In one the earlier lessons, we turned on the snapping to the endpoint a line with the OSNAP command. You can achieve the same thing by typing end when the program is expecting a point. Press return after typing end then click on the end point a line, arc, or circle. Start here End here LINE From Point: end {type this to tell the program that you want to use the end point a line to start the new line that you are drawing} {click on the starting point above} To Point: To Point: @2.5<210 The top the box will be drawn next. We will start with the top right corner the box we have just finished drawing. Stop here Start here LINE From Point: end {click on upper right point box} To To Point: end {complete point by clicking on end the correct point} When you have finished, you should have a box like the one shown on the right. Next we need to draw the arcs making up the object. These are actually ellipses because the isometric view. We use the ELLIPSE command to draw them. AutoCAD does not draw elliptical arcs but it does draw complete ellipses and we can trim these to create elliptical arcs. We will start with the arc at the bottom the box shown in the Isometric Drawings in AutoCAD R Greenlee Page 2

3 picture at the right. Use the CTRL E key combination to change the mouse pointer so that the lines are parallel with the edges the right face (<Isoplane right>). ELLIPSE <axis end point 1>/Center/Isocircle: I Midpoint Line Isocircle Center circle: MID {We want the center the Isocircle to be at the midpoint the line} {select the line at the bottom the right face} <Circle radius>/diameter:.75 Now we can erase the part the ellipse we do not need with the TRIM command. TRIM Select cutting edge(s)... {select the line} Select objects to trim: {select bottom circle} TRIM Select cutting edges... {select upper half isocircle} Select object to trim {Select the line through the isocircle} Select object to trim Cutting edge Part to trim Cutting edge Part to trim Isometric Drawings in AutoCAD R Greenlee Page 3

4 We need to add a line at the bottom edge the arc. We can do this by drawing a line that is too long then trimming it with the TRIM command. This will complete the bottom part the object. Add this line LINE From point: END {select end arc} To TRIM {Select the arc as the cutting surface and trim the line that we have just drawn. The arc and line are shown in the figure below} We must start on the half cylinder that intersects the top the block. We will do this by drawing four ellipses along the side the block. Use the CTRL E command to place the mouse pointer lines parallel to the edges the left face the box. ELLIPSE <Axis endpoint 1>/Center/Isocircle: I Center circle: MID {Select top left edge box} <Circle radius>/diameter: 1 Isometric Drawings in AutoCAD R Greenlee Page 4

5 Repeat the ELLIPSE command to create the larger, 3 inch diameter ellipse then repeat it two more times to create the ellipses on the other side the box. After you have draw the ellipses, trim their tops with the TRIM command. Use the edges the box as the cutting planes. The figure on the right shows the isocircles after trimming. The next step is to form the ends the half cylinder shape. We can do this by moving the inside diameter arcs to the ends the cylinder and copying the outside diameter arcs to the ends the cylinder. MOVE {Select the inner circles on the left side} Base point or displacement: END {Select the end the inside arc} Second point Repeat this command for the other side and move the inside arc.75 inches at an angle 30 degrees. Next copy the outside diameter arcs to their end positions on the cylinder. You can do this with the COPY command. COPY <Base point displacement>: Second point Copy the arc on the other side the object using a similar command sequence. When you finish you should have the picture shown on the right. {Select the outer arc on the left side the object} END {Select the end the arc} Move these Copy these Isometric Drawings in AutoCAD R Greenlee Page 5

6 Use the TRIM and the ERASE commands to remove the edges the box that cannot be seen. Tangent here Next, we will draw the line tangent to the Near here arcs. This line forms the outside edge the cylinder. Press CTRL E until the mouse pointer lines are parallel to the right face the box and then type: LINE Point from: NEAR Point to: TAN {Click on one the arcs as close as you can to the tangent point.. You may have to zoom in on the arc to select it.} {Select the other arc. You should move the mouse pointer as close to the tangent point as possible.} Finally we do a little more trimming and erasing the arcs on the cylinder and we have the finished drawing shown below. We can now place the view on the drawing sheet by selecting the Layout1 tab at the bottom the screen and following the procedures we discussed in Chapter 6. Isometric Drawings in AutoCAD R Greenlee Page 6

7 Difficult Curves Sometimes when drawing an isometric view, the curves that you must draw cannot be drawn with an ellipse. A simple example is shown in the drawing below. The curve where the cylinder meets the curved surface cannot be drawn with a simple ellipse or ellipse. It can be drawn however and we will illustrate it with the object shown above. Start by drawing simple isometric object like the one shown on the right. Use the drawing above for the dimensions this box. Isometric Drawings in AutoCAD R Greenlee Page 7

8 Next we will add two ellipses to either side. The ellipses have a radius The object with the ellipses is shown on the right. When you have completed the ellipses, trim them so that only the parts that are edges the object are remaining. The edges the box can be used as the cutting planes. Next, draw lines connecting the ends the ellipse segment. These can be easily drawn with the mouse. OSNAP should be set to ON so that the mouse pointer will snap to the ends the ellipse segments. Isometric Drawings in AutoCAD R Greenlee Page 8

9 The cylinder intersects the top plane the object, and we can draw ellipses at the intersection. The large one has a radius 2 and the smaller one has a radius 1. After drawing the ellipses, trim the larger one and the line passing through its center. This is illustrated in the drawing on the right. When you draw the ellipses, you can use the MID command to locate the center the ellipses at the midpoint the line passing through their centers. ellipse Specify axis endpoint ellipse or [Arc/Center/Isocircle]: i Specify center isocircle: mid Specify radius isocircle or [Diameter]: 2 Construction line We can now draw a construction line to help us determine the intersection the cylinder and the curved surface. Switch to the projection layer and add a line that connects the two corners the box. We are going to create evenly spaced construction lines perpendicular to and along the length the construction line we have just crated. We will use these lines to help us create a tessellated surface on the cylinder which we can intersect with a tessellated surface on the intersecting curve. We start by creating 10 equally spaced points along the line. This is done with the DIVIDE command. Points are very small and you will probably not be able to see them, just accept the fact that they are there. divide Select object to divide: Enter the number segments: 10 {Click on the construction line we have just created} {Enter 10 and press return} Isometric Drawings in AutoCAD R Greenlee Page 9

10 Next, we will turn on snapping to points so that AutoCAD can use these 10 equally spaced points as the beginning point lines needed to construct the tessellated surface. Enter OSNAP to produce the dialog box shown on the right. Click on the Node snap mode then click on OK. Turn ORTHO on and use CTRL-E until the mouse pointer has a line parallel to the back the object we are drawing. Use the line command to draw the line. The results are shown below. Snap to Node line Specify first point: Specify next point or [Undo]: Specify next point or [Undo]: {Move the mouse over to the first point we created and click} {Extend a line parallel to the back the object until it crosses the line connecting to the ellipses we drew} {Press Enter} New Line Isometric Drawings in AutoCAD R Greenlee Page 10

11 Now we can copy this line creating a new line at each the 10 points we created. Copy Current settings: Copy mode = Single Specify base point or [Displacement/mOde/Multiple] O Enter a copy mode option [Single/Multiple] <Single>: M Specify base point: Specify second point: The results are shown on the right. {1 Click on line} {Press enter} {The current copy mode is Single. Enter O to change the mode} {Enter M to change the mode to Multiple} {2 Click on base line} {3 Click on next point. Continue the process until all the lines are drawn.} Next we will extend lines down starting at the intersection the lines we have just created and the cylinder. Use CTRL-E until one the mouse pointer lines is vertical and draw the lines with the mouse. You only need to draw vertical lines where the construction lines cross the larger ellipse on the top the object. The results are shown on the right. Isometric Drawings in AutoCAD R Greenlee Page 11

12 Now we will copy the curves along the curved surface. These are can be created with the copy command. copy Current settings: Copy mode = Multiple Specify base point: Specify second point: Specify second point: {1 Click on the curve} {Press Enter} {2 Click on the center the arc} {3 Click on the first point we created. Continue the process until you have created all the curves.} {Press Enter} The results are shown on the right. Now we can connect the intersections the curves we have just created with the vertical lines we created in the previous step to generate the intersection the two curved surfaces. We will use the PLINE command to create this line. The PLINE command creates a poly line that can be smoothed to generate a more realistic surface. Switch to the object layer before you create this line. A significant amount care must be exercised to make sure the correct vertical line connects to the correct curve pline Specify start point: {1} Current line-width is 0.00 Specify next point: {2} Specify next point: {3} Specify next point: {4} Specify next point: {5} Specify next point: {6} Specify next point: tan {Tangent point to curve} 1 Tangent Isometric Drawings in AutoCAD R Greenlee Page 12

13 Next, we need to remove all the construction lines. The straight lines were drawn in the projection layer so these can easily be turned f. The curves, were copied so they are in the object layer. We can either erase them or we can change their layer to the construction layer. This can be done with the CHANGE command. The CHANGE command can be used to change many different attributes, but we will use it just to change the layer. change 1 found Specify change point or [Properties]: P Enter property to change [Color/LAyer/LType/ltScale/Thickness]: LA Enter new layer name <Iso>: Proj Enter property to change [Color/LAyer/LType/ltScale/Thickness]: {Select each the curves that were used as construction lines} {Press Enter} {Enter P to change the properties} {We are changing the layer} {The new layer is Proj} Now that we have changed the curves to the Proj layer, we can turn them f. The resulting drawing is shown on the left. The drawing on the right shows the object after trimming the horizontal and vertical lines on either side the object. The drawing on the right looks reasonable, but the curve at the intersection the two surfaces that we generated is not as smooth as it should be. We can use the PEDIT command to smooth the line. Isometric Drawings in AutoCAD R Greenlee Page 13

14 PEDIT Select polyline or [Multiple]: Enter an option [ /Fit/Spline/ ]: S Enter an option [ /Fit/Spline/ ]: {Click on the pline} {Use the Spline option} {Press Enter} There are two options that allow you to smooth the curve. One is Fit and the other is Spline. The Fit option fits a smooth curve through the vertices the original PLINE and the Spline option smoothes the curve but does not force the line through the vertices. You might want to try both these options and pick the line that looks the best. The finished drawing is shown below. Isometric Drawings in AutoCAD R Greenlee Page 14

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