CAD basics, basic functions of CAD

As for the CAD upstairs, a lot has been said, so I won't talk about it here, if you want to learn indoors, you have to learn 3DMAX, and it's best to learn some PS

What foundation do you want to learn, 2D or 3D? Some of the commands can be found in the menu, or in the command line, which I used to teach in computer school, and it is easy to learn them if you learn them seriously.

Basic functions of 2D CAD:

Planar drawing: You can create basic graphic objects such as lines, circles, ellipses, toroidal polygons (regular polygons), splines, etc., in a variety of ways.

Drawing aids: Drawing aids such as orthographic, object snap, polar tracking, snap tracking, etc. are provided. The orthographic feature makes it easy to draw horizontal, vertical straight lines, object snaps help pick up special points on geometric objects, and the trace feature makes it easier to draw diagonal lines and locate points in different directions.

Graphics: CAD has powerful features to move, copy, rotate, pattern, stretch, extend, trim, scale objects, and more.

Dimensioning: You can create a variety of types of dimensions, and the appearance of dimensioning can be set by yourself.

Write text: You can easily write text anywhere and in any direction of the graphic, and you can set attributes such as text font, tilt angle and width zoom.

Layer management function: Graphic objects are located on a certain layer, and you can set the object color, line type, line width and other characteristics.

3D Drawing: 3D solid and surface models can be created, and the solid itself can be performed.

1) After opening the CAD program, select the "AutoCAD Classic" interface in the workspace. Select a drawing template when creating a new CAD file". The drawing window is divided into two tabs: model space and layout space, and in the lower right corner is the coordinate system icon and the coordinate origin.

2) Commands, system variables, options, information, and hints are displayed in the command window. When entering a command in the command window, be sure to "enter" to confirm. Hide the command window "Press Ctrl+9".

Open the command text window and press the "F2 key" to check the drawing process.

3) The function of the menu bar and toolbar is to quickly enter, set and execute commands. Hide the menu bar and toolbar "press Ctrl+0". Open the toolbar, right-click with the cursor to any toolbar and select the desired toolbar.

4) Open the shortcut menu when right-clicked, hide the shortcut menu, click on the "User System Configuration" tab of the "Options" dialog box of the "Tools" menu, clear the "Use shortcut menu in the drawing area" option under "Windows Standard".

AutoCAD is used for 2D drawing, detailed drawing, design documentation and basic 3D design, and has become a widely popular drawing tool in the world. I have compiled the relevant content, welcome to enjoy and learn from it.

1. CAD Meaning

_computeraided design and drafting

Computer Aided Design & Drawing.

AutoCAD is a graphics processing software developed by Autodesk on IBM series microcomputers in the United States.

TENGEN Architecture --- professional drawing software for architecture based on CAD.

2. Schematic design - analysis and calculation - engineering drawings

3. Basic Functions:

1. Basic drawing function. Bitmap vector graphics.

2. Graphic function.

3. Display control.

4. Tools. 4. Interactive Drawing:

AutoCAD is an interactive graphics processing software that operates through user input commands.

5. Command input mode:

1. Pick it up from the menu according to the classification of the command.

2. Enter the command character directly in the command state in the command area. Such as:

Command: line

Specify the first point:

Specify the next point or [discard(u)]: 100,100

Specify the next point or [close(c) discard(u)]:c

C: Closed. 6. Data input method:

The data input of any graph can be summarized as the input of points.

1. Pick up the center of the cursor.

2. Keyboard data input:

1.Absolute Input Method:

Absolute Input Method: The origin of the previous lower left corner of the screen (0,0,0) of the input point is the coordinate origin.

Always a numeric input relative to the origin 0,0,0.

Command: line

Specify the first point: 10, 10

Specify the next point or [discard(u)]: 100,100

Specify the next point or [close(c) discard(u)]: 200, -200

2.Relative input method:

The point you enter is the relative coordinate origin from the previous point.

Numeric input relative to the previous point.

Command: line

Specify the first point: 10, 10

Specify the next point or [discard(u)]: 100,100

Specify the next point or [close(c) discard(u)]: 200, -200

3.Polar coordinate input method.

The input point is the axis of the previous point, the distance between the two points is the radius, and the angle between the line between the two points and the horizontal line is the pole angle.

Command: line

Specify the first point:

Specify the next point or [discard(u)]: 100<45

Specify the next point or [close(c) discard(u)]: 100<-60

Basics of Architectural CAD:

1. The formation, use and naming of the elevation drawing:

The orthographic drawing made on the lead vertical projection plane parallel to the building façade is called the building elevation, or elevation for short. The façade chaos diagram mainly reflects the height, appearance and decoration requirements of each part of the house, which is the main basis for the exterior decoration of the building.

There are three ways to name an elevation:

1. Named with orientation: a certain façade of a building faces that direction, which is called the elevation of that direction.

2. Naming according to the appearance characteristics: the side of the building that reflects the main entry and exit type or reflects the appearance characteristics more significantly is called the front elevation, and the rest of the elevations are the back elevation, the left elevation and the right elevation.

3. Name with the first and last axes in the building plan: name according to the order of the observer's axis facing the building from left to right.

All three of these naming methods can be used in construction drawings, but each set of construction drawings can only be named in one of these ways.

Second, the graphic content and prescribed drawing method of the building elevation.

1. Basic content.

1) The building elevation mainly indicates the shape of the building façade;

2) the distribution, shape and opening direction of doors and windows on the façade;

3) The shape and position of roofs, balconies, steps, canopies, window sills, legs, and rainwater pipes;

4) Exterior wall decoration practices are lead;

5) Relative elevation and detail index symbols of indoor and outdoor floors, window sills, window tops, balcony surfaces, canopy bottoms, cornices, etc.

2. Specifications and requirements.

1) Positioning axis.

Generally, only the axes and numbers at both ends of the plan are marked, and the numbers should be consistent with the floor plan.

2) Graph lines. The outline of the elevation is represented by a thick solid line;

The outdoor floor line is represented by a double of the thick solid line (the line width is about a multiple of the thick solid line);

Door and window openings, cornices, balconies, awnings, steps, etc. are represented by medium solid lines;

The rest, such as wall dividers, door and window lattices, storm sewers, and lead-out lines, are represented by thin solid lines.

3) Legend. On the elevation drawing, the doors and windows should be drawn according to the legend specified in the standard.

4) Size note.

On elevations, height dimensions are mainly expressed in elevations. Generally, it is necessary to note out the elevation of the indoor and outdoor floor, the ground of one floor, the upper and lower openings of the window opening 9, the top surface of the parapet wall, the entrance platform surface and the bottom surface of the awning.

5) Exterior wall decoration practices: Exterior walls can be selected with different materials and practices according to the design requirements, and text descriptions with guide lines are often used on the drawings.

3. Examples of elevation reading.

1. Understand the appearance and shape of the building from the front plan, and compare it with the floor plan to understand the detailed shape and location of the roof, name, canopy, steps, etc.

2 Understand the height of the building from the elevation.

3 Understand the renovation practices of buildings.

4 Understand the meaning of index symbols on elevations.

5 Learn about other elevations.

6 Establish the overall shape of the building.