Introduction teaching of AutoCAD drawing
Li Xiaoming 2021-02-23 07:30:01

Be familiar with engineering drawing cad, From the standard 、 mapping 、 mark 、 It's easy to start with four aspects of printing , It is suitable for the production of the tutorial and the convenience of personal understanding , It's not comprehensive . In addition, because of their general level , I'll try to be more specific , In order to better understand .

One 、 standard

Engineering drawing includes equipment drawing , flow chart , There are three kinds of layouts . The general equipment diagram contains the main equipment View And top view . The layout must show the orientation .

Standards mainly refer to drawing standards , Including the national standard , Industry drawing standards and so on . For example, the national standard stipulates the marking of welding seam, etc . Another example is the title bar of chemical engineering drawing , The standard of making parts list, etc . There are also material pipelines used in the drawing process 0.9mm Thick line , The diameter of instrument circle is generally specified 10mm Such a death rule .

But generally these are not very important , In actual operation , As long as the drawing is clear , A sketch with clear content expression is enough .

Two 、 mapping

cad Drawing mainly depends on cad Drawing toolbar and modify Modify the tools in the toolbar .( Just understand first , No need to memorize )

AutoCAD Introduction to drawing teaching

AutoCAD Introduction to drawing teaching


In the use of drawing tools , Combined with the auxiliary operation of the status bar , Can be faster to complete the production of drawings .

AutoCAD Introduction to drawing teaching


The commonly used states are orthogonal , Polar axis , Object capture . If you don't use them frequently, you won't introduce them one by one .

orthogonal : For drawing straight lines , Copy the vertical or horizontal movement of the movement . You can cancel it when you don't need it any more .

Polar axis : Help draw at the end of the intersection . It can also be used to draw straight lines .

Object capture : It is mainly used to capture and display the intersection point or the center point .

Complete the teaching of various drawing tools , It will be a boring job . It takes time and effort to explain one by one , It doesn't feel necessary at all . So I'll start with a few common tool operations , And then according to the principle of similarity , Leave a leaf and know the autumn .

Before introducing this, let's first talk about some common sense :

1、 About the application of the mouse

Cad The mouse wheel has three functions ,1、 You can zoom in and out of the drawing interface by turning the scroll wheel , But it can't reduce and enlarge the actual size and scale of the drawing .2、 The single roller can be used as a grabbing tool , Any control of the location to be drawn is in the center .3、 Left click to select action options , And then follow up operation .

2、 Some of the operations in the options

and word similar , I usually learn a software , First, you'll learn about some of the options , In order to facilitate and simplify the subsequent drawing work may bring inconvenience .

stay “ Tools ” Open at the bottom of the column “ Options ”

AutoCAD Introduction to drawing teaching


First look at “ Show ”, Note the circle part , The crosshairs are usually set to 25 It's better around ,“ Color ” You can adjust the background color in the check box , Like ash ( black ) It's white : Check off the brown mark → Turn on the color check box →

AutoCAD Introduction to drawing teaching


choice “ Window elements ” Model space background , choice “ Color ” white .

Look again “ Open and save ”

AutoCAD Introduction to drawing teaching


Explain it. :dwg yes cad File specific format , similar doc yes word Unique format ,docx yes word2010 And so on .

Save automatically : It can be adjusted to 5 minute .

Look again “ The sketch ”. Many of them need not be changed , It may be used in the future . Especially about auto capture settings .

AutoCAD Introduction to drawing teaching


3、 New file

Ctrl+N perhaps “ file ” Click New

AutoCAD Introduction to drawing teaching


“ New file template ” You can choose some fixed blank templates , But I didn't find a similar blank document .

If you don't have it on your computer , Just open any document , Like the first one . Choose to open , Then scroll it down in the open document , Click the mouse to draw a rectangle to select all the graphics in the document , then “delete” Delete .

Save as new document on desktop . Then switch to the desktop , After copying the new document , Switch to cad, Click new again , stay “ New file template ” Paste... In the middle box . Then drop down to find the required blank file .

4、 Layers ( Just be clear )

Cad Layers : For convenience cad Standardization of , You usually need layers to help . for example , Set the layer to be divided into : Main equipment line , Dotted line , Tectonic line , Material line and so on .

AutoCAD Introduction to drawing teaching


Click on “ Layer bar ” Layer Properties Manager ( top left corner ), You can turn on the management layer .

For example, I create a new layer , And named the main equipment line : Click on the color ( Created layer column ), Set the color to yellow

AutoCAD Introduction to drawing teaching


Click linear (continunos), Then click load , You can choose the desired linearity . Here is the default , No choice .

AutoCAD Introduction to drawing teaching


Click line width , choice 0.9mm( Tulio )

Click OK , close .

AutoCAD Introduction to drawing teaching


Click the drop-down button , Select the layer you created , Then turn on the light bulb , Turn on the layer , That's all right. .

The specific effect is as follows :( There's something to add )

AutoCAD Introduction to drawing teaching


5、 Add

Like the rectangle in the picture above , I have two ways to select the rectangle , A kind of , Use the mouse to draw a rectangle from left to right to surround it all ; another , Just use the mouse to draw a small rectangular box from right to left to expand one side . This method is complete cad Universal .

6、 Give examples to illustrate how to use several common tools .

First , First explain cad and photoshop And so on, just like software , Its tool calls all have shortcut keys , but cad Shortcut keys are not very useful , I won't introduce it here .( But there are exceptions to everything , Remember that esc The key is a shortcut to command cancel ;delete It's a delete command .)

AutoCAD Introduction to drawing teaching


In turn

A straight line : Click on “ Line tool ”,cad The line drawing command will appear in the command bar .

So we have two ways of drawing :

The first one is , Directly click the mouse to line at any selected position on the drawing .

such as , First the “ orthogonal ” Choose ( It helps to construct horizontal and vertical lines ), Click any point on the model interface , Then drag the mouse to move and click , Press again esc that will do .( In the orthogonal state , It can only move vertically or horizontally . You can try to get rid of the orthogonality .)

AutoCAD Introduction to drawing teaching


The second kind , With the help of the command to complete the line drawing

You can see , After clicking the line drawing tool , There's a in the command bar “... Specify the first point :” The order of ( It is equivalent to operation prompt ), According to the command , Click any midpoint in the drawing interface , Click on . After clicking , The next command prompt will appear . Then operate according to the command prompt , A straight line will appear , And then click esc key , Can complete the line drawing .

AutoCAD Introduction to drawing teaching


Add : In line drawing , Just don't press cancel , Can operate continuously . But every two clicks , It's an independent straight line . This is the difference from multiple line segments .

next

“ rectangular ”, The same as above .

The first one is : After clicking the rectangle tool , Click any selected point on the interface , Then drag the mouse , According to the size of the drag artificially determine its size and position , Then click again .

The second kind : According to the command bar , Select and draw by operator in turn .

AutoCAD Introduction to drawing teaching


For example, drawing high 35 wide 45 The rectangular . Click any point on the interface , The command bar has changed .

AutoCAD Introduction to drawing teaching


After the size , Input d, Hit enter

AutoCAD Introduction to drawing teaching


Then enter the length ,45; Enter width ,35. Then click on another point . that will do .Esc Cancel the order .

Supplementary tips : If you find that the drawing is beyond the interface , Even if the interface shrinks to the minimum, you can't see , In this case, enter re command , Then tap the space once ( Or press enter ) that will do .

Third : round

Two kinds of operations , ditto .

But if you're going to draw some kind of conditional circle , Must operate according to the command .

For example : Draw a diameter of 12 Of , And the circle tangent to both sides of the rectangle in the above example .

choice “ round ” Tools → Input t→ Specify all points at the bottom of the rectangle according to the command , Click on → Again, by order , Specify the second tangent on the other side , Click on → Enter the diameter of the circle 12, Can finish .Esc Cancel the order .

Here's the picture :( The black line is a cross )

AutoCAD Introduction to drawing teaching


Add : When you select a drawing tool , You can choose from the toolbox , You can also do it in “ mapping ” Select... From the menu command .

For example, arc , Selection of drawing tools such as ellipse .

Last : Multiline text ( a key )

Click toolbox “ Multiline text ”, Then click the mouse to enter the location , After dragging the right size , Two clicks

AutoCAD Introduction to drawing teaching


first line : And then the Fonts , character height ( font size ), In bold , The font color . The second line is the input interface .

For example, I want to input : The height of the word is 3 Word , First set the word height to 3, And then input . Or enter the required text first , Then select all the text in the input interface , In setting the font height or other .

AutoCAD Introduction to drawing teaching


Pictured , This is after the text input is complete , Click on the screen after confirmation , If I click on the text again , Four blue dots will appear . Left click on one of these , You can change the size of the text box . If you want to move the font ,( In this state ) Just left click on the middle of the text box , Then drag it as you like . perhaps , With the keyboard ↓→↑← Key trimming .

Modify the toolbar :

AutoCAD Introduction to drawing teaching


Delete , Copy , Mirror image , The offset , array , Move , rotate , The zoom , The tensile , Break in a little , interrupt , Chamfering , Fillet decomposition .

Delete ( Shortcut key delete), Mirror image , Entire column , rotate , The zoom , It's also more commonly used , I'm not going to talk about , You can feel for yourself .

Let's start with replication :

Click Copy tool , Follow the command prompt on the command bar , For example, I want to copy the rectangle . Select the rectangle in the picture from right to left , selected .( When the rectangle becomes a dotted line , That is to select .)

AutoCAD Introduction to drawing teaching


Hit enter . Pictured , Turn on object capture , Click the bottom right corner of the rectangle as the base point .

AutoCAD Introduction to drawing teaching


then , Select the location to copy , Just click again .( Generally moving the mouse will appear a virtual copy image .) Pictured

AutoCAD Introduction to drawing teaching


After canceling orthogonality , It can be copied in a non horizontal or vertical way .

Add layer effect : Set the line width 0.9mm effect , stay cad Can be displayed or not displayed in .

Pictured :

AutoCAD Introduction to drawing teaching


Click line width , Enter the line width display state , Cancel , The line width is not displayed .

AutoCAD Introduction to drawing teaching


The offset : Like replication , After clicking the offset tool , Follow up operations according to the command prompt on the command bar .

Offsets are generally used to make tables , Like the title bar , Technical characteristic table, etc .

Move : Similar to the copy command , Put a selected graph , Move from initial position to ideal position , The initial position will no longer exist for the moved figure .

interrupt :

branch “ Break in a little ” and “ interrupt ” Two tools , The former is used to break the intersection of lines , The latter is more useful . The specific difference can be operated by yourself .

decompose :

Will be similar “ pline ” or “ rectangular ” This kind of multi line combination into a unit graph , It can be used “ decompose ” The tool breaks down into several independent lines . But don't change the shape .

This operation is the simplest , Just select the graph to be decomposed , Then click the decompose button .

Add :

The operation mode above , The same applies to replication , Mobile and other tools , That is, select the graph first , Then select the tool to operate .

3、 ... and 、 mark

The common ways to mark are linear ( LWH ), angle , radius , The diameter of , If you only need to operate linear annotation , You can use the quick labeling tool to complete the labeling task more conveniently .

And the operation of other tools , You can operate according to the command prompt on the command bar , I won't introduce you here . Two examples .

angle

AutoCAD Introduction to drawing teaching


Angle two small circles , Linear labeling of large circles .

Operation steps :

Angle labeling :

First , Create a new layer if necessary , Named annotations , Change the color , And so on . This step is omitted here .

To mark angles , First, we should see if the second line is independent , That is, the second line is not the combined line of the rectangular box , It's a separate one ( Click on it. , Only the line becomes empty ). If it's a rectangle and a line , We should use “ decompose ” The tool decomposes the rectangle .

Then the menu bar “ mark ” Column selection “ angle ” Tools , Follow the command prompt , Select two lines in turn , Then drag the mouse to the right position , Mouse click .

AutoCAD Introduction to drawing teaching


What's marked “ mark ” There are three parts. :( It can be broken down by decomposition , And then modify it separately to the right size .) The process is brief .

1、 Mark radians ( Advanced version cad The default is multiline text , It can be rewritten directly ).

2、 Mark the arc .3、 Two way arrow .

Linear dimensioning :

? Quick tagging

choice “ Quick tagging ” According to the prompt , choice ( Click on ) The line to be marked , After selection , Tap the space , Drag the mouse to the right place .

linear

choice “ linear ” Dimensioning tools , According to the command bar , Select the two ends of the line you want to mark , Then drag the mouse to the right place .

After the above , Borrowing decomposition , written words , The zoom , Move , Copy and other tools to modify the dimension , Until it's proportional .

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AutoCAD Introduction to drawing teaching

AutoCAD Introduction to drawing teaching

AutoCAD Introduction to drawing teaching

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