Advanced CAD practice (2)

Let's draw an advanced practice problem with CAD Dream Drawing.

Analysis Description

1. The circumference angle subtended by the diameter of the circle is equal to 90°. This geometric knowledge can determine the vertex of the right angle in the drawing.

2. The "divide" command can "divide" the object by a fixed number.

target audience

Operating Tools

Operating system: Windows10

CAD Software: CAD Dream Drawing

Steps

1. Click Point Style under the Format menu bar to open the "Point Style" dialog box, as shown below:

Open Point Styles dialog

2. Select the display obvious point style and click OK, as shown below:

Select point style

3. Enter the Rectangle (REC) command on the command line to draw an 80X80 square ABCD, as shown below:

Draw a square

4. Select the square ABCD and enter the decomposition (X) command to decompose the square, as shown in the following figure:

Breakdown Square

5. Enter the offset shortcut key on the command line to offset the line segment BD up by 30 units to obtain the intersection points of the line segment EF with the line segment AB, line segment CD and E, F, as shown in the following figure:

Offset line segment BD

6. Enter the circle (C) command on the command line and then choose to use (2P) two points to draw a circle, as shown in the following figure:

Select 2p circle command

7. Take points E and F as the first and second endpoints, draw a yellow circle with the line segment EF as the diameter, and intersect the line segment BD at point G on the left, as shown in the following figure:

Draw a yellow circle

8. Enter the line (L) command on the command line, and capture the points E, G, and F to draw the line segment EG and the line segment GF, because the line segment EF is the diameter of the circle, so ∠EGF=90°, as shown in the following figure:

Connect line segment EG, line segment GF

9. Select the circle to delete the circle, select the line segment GF, enter the rotation (RO) command on the command line, capture the point F as the base point of the rotation, and copy it at the input C, because it needs to rotate clockwise, so the input selectionThe angle is -75°, as shown below:

Rotate copy segment GF

10. The line segment FH obtained after the rotation and copying is completed and the line segment AC intersect at point H, as shown in the following figure:

Rotation copy completed

11. Select the line segment EF, delete the line segment EF, and then use the line (L) command to capture point E and point H to draw first point EH, as shown in the following figure:

Connecting line segment EH

12. Use the trim (TR) command to trim according to the drawing needs, as shown below:

First trim object

13. Enter the OFFSET command on the command line to perform the following offsets, offset the line segment HE to the left by 10 units to obtain the line segment MN; offset the line segment MN to the left by 10 units to obtain the line segment PQ;Offset the line segment PQ to the left by 10 units to obtain the line segment RS.As shown below:

Offset by three segments

14. Enter the line (L) command on the command line, capture point H and point R to draw line segment HR; capture point E and point S to draw line segment ES, as shown in the following figure:

Connect line segment HR, line segment ES

15. Enter the DIVIDE command on the command line, select the line segment EH, and enter the number of constant divisions as 8 to draw 9 nodes. The 9 nodes divide the line segment EH into 8 segments.As shown below:

Equal Line Segment EH

16. Select the line segment HR, enter the copy (CO) command, and copy the line segment HR 7 times with the equal point as the copy point, as shown in the following figure:

Copy line segment HR

17. Use the delete command in turn to delete the equal node and the trim command to trim the object to the object required for drawing, as shown in the following figure:

Secondary trim object

18. Enter the circle (C) command on the command line, the snap point D is the center of the circle, the snap point H specifies the radius, and the drawn circle D and the line segment DC intersect the point T, as shown in the following figure:

Draw a circle with point C as center and radius CH

19. Press Enter directly, use the circle command again, capture point F as the center of the circle, capture point T to specify the radius, and the drawn circle F and line segment DC intersect at point V, as shown in the following figure:

Draw a circle with point F as center and FT as radius

20. Press Enter directly, enable the "Circle" command again, snap point D as the center of the circle, specify the radius of snap point V, and draw a circle D, as shown in the following figure:

Draw Circle D

21. Command input trim (TR) command, trim according to drawing needs, as shown in the following figure:

Three Trim Objects

22. Finally, modify the color and dimension, and the final effect is as follows:

End result