Save As: 2D_Drawings_5

The following exercise will help us utilize the HATCH command and understand it a little better. One thing that is interesting about this exercise is the “angle game” this exercise will reinforce how familiar you are with finding the correct angle to input into AutoCAD.

5a

After finishing drawing, which you will do without problem, you will use the HATCH command. This command helps you create a pattern like the one in the image above. Hatch command located under the Home panel> draw tab.

5b

 

To use the HATCH command in AutoCAD

  1. Click on the HATCH icon (Home tab> Draw panel)
  2. Select the Hatch pattern you want
  3. Click to determine the HATCH boundary
  4. Hit the ENTER key

After activation of the HATCH command in Step 1, the HATCH creation bar appears and allows you to fix the settings of the HATCH you are creating.

The HATCH pattern used for this exercise is ANSI32. You can navigate through the available patterns using the HATCH creation bar shown above. You can also change the angle, the transparency, and other settings.

2D_Drawing_6

Save As: 2D_Drawings_6

Replicate the image below in AutoCAD, all dimensions given.  This figure most difficulty part is simply to learn how to draw a circle with specified radius tangent to two objects. As you can see from the figure below, we need to be able to create the R2.8125 circle and R1.1719 circle.

Dimension Style Settings: (Annotate tab/Dimension panel/settings arrow bottom right corner)

  • Lines/ Dimension lineweight = 0.00
  • Lines/ Extension lineweight = 0.00
  • Symbols & Arrows / Arrowheads-Dot small
  • Text height: .1

 

1del

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The line AB forms an angle of 30 degrees with the horizontal. To draw this line, follow these steps:

  1. Activate the LINEcommand
  2. Click on point A
  3. Write @3.2798<30
  4. Hit the ENTER key

6b

To obtain the two large circles, you will have to make sure the OBJECT SNAP mode is set in a way to let AutoCAD detect Tangent points, and use the CIRCLE command shown below.

6c

Find this command and use it to draw the two large circles.

select tan tan radius > select the first tangent point, then the second tangent point> enter the radius. (re-select tangent points if output is incorrect)

Save As: 2D_Drawings_7

 

In this exercise as you can see, all members are neither vertically positioned nor horizontally positioned. All dimensions are vertical and horizontal.

How do you think you can go about finishing this exercise? where do you think you can start for things to be easy?

7a

Tips

Start by drawing the upper side. Start from 1, then 2. And lastly, rotate from one leg with an angle of 40 degrees (Be sure to select the center of the leg as base-point to rotate). Play with the line and position it like in 3.

Don’t CARE (in the sketch) just means that when you are drawing that object lying down, you do not have to bother with the dimension of the line where this is mentioned. The objective of this is to get the shape right. However, after you rotate it then you need to figure out how to stick it to the line of length 6 at the right position, which is actually easy following the process below.

7b

Now, you may use the same technique to get the second part. Draw it standing up, and then you can rotate it with an angle of 50 degrees. The point D will be used as the BASE Point of the rotation. After rotation, find a way to put it at its right position, and use the trick demonstrated on the figure below to find the center of the remaining circles.

Note that the 2 other circles are identical to the first one. This means that R = 0.7. In addition, A and C represent the centers of other circles.

12

I believe we tackled this the easiest way possible, but it is not the only way, so feel free to try it your way also.