Home / Autocad Practice

Line Drawing Command A. Enter Command

Shortcut key: F 8 or Ctrl + O

Command structure:

Command: Ortho

Enter mode{ON/OFF}: Select on/off mode.

3.2.Snap command:

The Snap command controls the cursor state, determining the cursor jump and rotation angle of the two hairs. The Sap state, similar to Grid, Ortho is controlled by the Status bar.

Enter command:

Pulldown Menu: Format Drafting settings.. Type command: Snap, Dsettings

Shortcut key: F 9 or Ctrl+B

Command structure:

Command: Snap

Specify snap spacing or{ON/OFF/Aspect/Rotate/Style/Type}: enter the cursor spacing value (X,Y directions are the same).

On/off: turn on/off the mode of moving the cursor according to the predetermined distance, you can press F 9 or Ctrl+B instead of calling the command.

Aspect: The step values ​​in X and Y directions are different. Rotate: Rotate 2 hairs around a reference point by 1 angle.

Style: Create Snap style for drawing the axonometric projection.

3.3.Grid command:

The Grid command creates grid points within the drawing bounds.

Enter command:

Pulldown Menu: Format Drafting settings… Type the command: Grid

Shortcut key: F 7 or Ctrl+G

Command structure:

Command: Grid 

Specify grid spacing (X) or{ON/OFF/Snap/Aspect}: enter the spacing of grid points (in X,Y direction is the same).

On/off: turn on/off the grid at a predetermined distance, you can press F 7 or Ctrl+G instead of calling the command.

Aspect: The distance between grid points in X,Y directions is different. Snap: The distance between grid points is equal to the cursor distance.

B. REVIEW QUESTIONS AND EXERCISES:

I. Review questions

1. Question 1: Describe ORTHO mode?

2. Question 2: What is Snap mode?

II. Exercises

Exercise 1: Open a new drawing with the Acad ISO Named Plot Styles option. Save the drawing with the student's name in drive D.

Exercise 2: Perform the Ortho mode call operation.

CHAPTER 3: BASIC DRAWING COMMANDS AND COORDINATE SYSTEM

Time (hours)

LT

TH

BT

KT

TS

1

3

0

0

4

Target:

After completing this chapter, students will be able to:

- Fully present the concepts of relative coordinates, absolute coordinates, absolute polar coordinates, and relative polar coordinates.

- Proficient in using commands to draw lines, circles, polygons, coordinate input methods and drawing commands

- Practice being careful, meticulous and accurate in work.

Key issues to be covered

- 1. Coordinate system

- 2. Basic drawing commands

Maybe you are interested!

COURSE CODE CNOT 08.1

A. CONTENT:

1. Coordinate system:

1.1. Absolute coordinates:

Coordinates of a point relative to the origin in the specified direction.

1.2.Relative coordinates

The coordinates of the point relative to the origin are the previously entered points. At the command prompt, we enter @X,Y.

1.3. Polar coordinates

a. Absolute polar coordinates

The absolute polar coordinates of a point are determined by the distance D between the point to be entered and the origin (0,0) and the inclination angle  of the line segment created by the origin.

D<.

Degree and point to be entered compared to the standard line, symbol A

D

Standard line


For example: Point A has a distance of 100 from D to O(0,0), the angle of inclination OA compared to the standard line =30 0 , we enter 100<30

b. Relative polar coordinates

The relative polar coordinates of a point are determined by the distance D between the point to be entered and the last entered point and the inclination angle  of the line segment.

created by the relative coordinate origin and the point to be entered compared to the standard line, symbol

@D<.

Sign convention: Positive angle (for example =45 0 ) is the angle measured in the opposite direction of the equation. Negative angle is the angle measured in the direction of the equation.

1.4. Enter distance directly:

Enter the relative distance to the last point, orient with Cursor and Enter (can combine Ortho ON)

2.Basic drawing commands:

2.1. Line drawing command a. Enter command

Pulldown Menu: DrawLine

Screen menu : DRAWLine Toolbar :

Type command: Line or L

b. Statement structure

Command:Line

Specify first point: enter the coordinates of the first point.

Specify next point or {Undo}: enter the coordinates of the next point or U cancel the last entered point.

Specify next point or {Undo}: continue entering the coordinates of the next point or U cancels the point just entered or Enter ends the command.

Specify next point or {Close/Undo}: continue entering the coordinates of the next point or U cancel the point just entered or C close the polygon or Enter ends the command.

Example 1: Use absolute coordinates to draw the following rectangle with coordinates of point A (50,25)


Example 2: Use relative coordinates to draw the following isosceles triangle:


Example 2: Use polar coordinates to draw the following figure:



2.2.Circle drawing command a.Enter command

Pulldown Menu: Draw Circle>

Screen menu : DRAW1 Circle Toolbar:

Type command: Circle or C

b. Statement structure

Command:Circle

Specify center point for circle or {3P/2P/Ttr (tan tan radius)}: select 1 point as the center of the circle.

Specify radius of circle or {Diameter}: enter radius (or if you want to enter diameter, enter D then enter diameter magnitude).

Other options:

3P: Draw a circle through 3 points.

2P: Draw a circle through 2 points, take those 2 points as the diameter.

Ttr: Draw a circle tangent to 2 objects and with a given radius.


Ttt: Draw a circle tangent to 3 available objects on the screen.

2.3. Arc drawing command a. Enter command

Pulldown Menu: Draw Arc>

Screen menu : DRAW1 Arc Toolbar :

Type command: Arc or A

b. Statement structure

Arcs are drawn in the opposite direction of the axis, there are many ways to draw arcs.

* Draw an arc passing through 3 points (3 point)

This is the default function.

Command: A

Specify start point of arc or (Center): Specifies the start point of arc P 1 .

Specify second point of arc or (Center/End): Specify the second point of arc P 2 .

Specify end point of arc or: Specify the end point of arc P 3 .


* Draw an arc when knowing the start, center, and end points (Start, Center, End)

Enter the start point, center point, and end point in turn into the command prompt.

* Draw an arc when knowing the starting point, center, and angle at the center of the arc (Start, Center, Angle)



* Draw an arc when knowing the starting point, center, and length of the arc (Start, Center, Length)

* Draw an arc when knowing the start point, end point, and central angle of the arc (Start, End, Angle)


* Draw an arc when knowing the starting point, center, and tangent direction of the arc at the starting point (Start, Center, Direction)

* Draw an arc when knowing the start point, end point, radius (Start, End, Radius).


*The remaining drawing functions are similar but only the order of point entry is different.

2.4.Ellipse drawing command a.Enter command

Pulldown Menu: DrawEllipse

Screen menu : DRAW1 Ellipse Toolbar :

Type command: Ellipse or EL

b. Statement structure

Command: EL

*Draw ellipse when knowing 2 axes: this is the default case.

Specify axis endpoint of ellipse or {Arc/Center}: Enter coordinates or select endpoint 1 of the first axis.

Specify other endpoint of axis: Enter the coordinates or select the second endpoint of the first axis.

Specify distance to other axis or {Rotation}: Specify the distance to the second half axis.

At this prompt, we can select Rotation to select the rotation angle around the circle axis 1-2.

Example of drawing the following ellipse

Comment


Agree Privacy Policy *