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Because AutoCAD is a vector program (Vector) is mainly used for technical drawing. It is therefore important to tell the size of the workpiece and there is a group of tools specifically for telling the size and job details, namely the Annotate:Dimension tool group.
In the Dimension group, there are also separate tools for dimensioning include :
1.Linear– defines dimensions in a straight line (both vertically and horizontally).
2.Aligned– defines dimensions parallel to the workpiece in all planes.
3.Angular– tells us the size of the angle in degrees between two objects.
4.Arc Length– tells the length of the arc (Arc) from the end of the arc.
5.Radius– indicates the radius of a circle. or part of a circle.
6.Diameter– tells the diameter of a circle. or part of a circle.
7.Jogged– tells a scaled down version. used in such cases The radial line is very far from the workpiece.
8.Ordinate– sizing based on the starting point.
To understanding, See the FIGURE 3 showing different dimensions below.
In the next chapter, we’ll look at how to use Dimension.
(Multiple)Point or Point is a command in the Draw group. I think that there are quite a few people who are curious about this command. What is it used for? If you use point to create workpieces, it may not be suitable. Because the work would come out as a line drawn by a point, and no one does that. So what is the benefit of this command?
Point here refers to the reference point itself. Creating a reference point is what we do when we want to divide the workpiece into parts, for example, with one straight line. Want to divide into 3 equal parts.
The dividing point is to use the point as a reference point. Therefore, Point can be used as a reference. Must have a face that is more noticeable than normal spots. We have to change the point style or Point Style to change from the normal way. The command used to change Point Style is ddptype.When typing the command, you will get a window as shown in FIGURE 2.
It found that there are many styles to choose from. Click on the Style box that you want to use.
Now let’s draw a horizontal straight line. Any length, then select the Divide command as shown in FIGURE 4.
Object to divide selects a straight line. Then enter the value number of segments as 4 (meaning divided into 4 parts).
The result is as shown in the FIGURE 6 the line is divided into 4 sections, referenced by points in the selected style.
Therefore, the Point command is the command to create a reference point. Using in conjunction with other commands, Point Style can be set by using the ddptype command.
Continuation of the story AutoCAD 1 Coordinate System Let’s look at the coordinate system (Coordinate) in 3 dimensions. As was known before from The Story of the Axis X, Y, Z are the axes that are already used in 3D work in AutoCAD, so coordinates can be done by referring to these 3 axes as well.
For example, I want to draw a line after a rectangle. (rectangular) to have a length of 300 units diagonally inward on all four sides to create a roof-like shape as in the FIGURE 1. How to do?
The principle is that we will draw a straight line from the starting point to the end point that is in the 3D plane, meaning that we need to know the exact coordinates of this endpoint. We can use the polar coordinate method straight away, according to the structure @dist<xy<xy plane or @ length < angle between the XY axes < angle on the XY plane, therefore If you want to draw a line from any angle, you must first check the UCS Icon if the chosen angle is equal to the plane according to the 2nd right-hand rule or not.
Like the FIGURE 2 below I will draw a line from the starting point (indicated in the figure) that has an angle of -45 degrees to the XY plane and has an angle of 45 degrees upward from the XY plane, thus setting the coordinates of the end point to be @300< -45<45
With this principle, I draw a line from the beginning (indicated in the picture) to the next. which has an angle with the XY plane equal to 45 degrees and an inclination angle up from the XY plane is 45 degrees, so the coordinates of the end point must be defined as @300<45<45 results in long lines. and tilted to the desired angle.
Coordinate setting like this May be a little difficult to understand Trying to learn about angles and the 2nd right hand rule to understand it will help you to understand more.
Working in 3D in AutoCAD is the result of coordination between Axis System, Coordinate System, and Viewpoint. Users need to understand these three basics in order to operate correctly. Axes and Perspective Shift have been mentioned in previous chapters.
Now here comes the matter of the Coordinate System (Coordinate System). The word Coordinate means to tell the position, or any point caused by the intersection of the axes in AutoCAD, represented by x,y (2 dimensions) and x,y values. ,z (3 dimensions) or called Cartesian coordinates the program will start drawing a line or shape from starting coordinates Continue to the next coordinate until it is finished.
Specifying the length or line distance Continue from the beginning, called the offset world (@), for example, starting at point 0,0 (x=0, y=0), continue to draw a horizontal line 10 units long, which is 10,0 (x=10, y =0) because the horizontal axis is the X axis, then enter at the end of the command will get a horizontal line of length 10 units.
In addition to AutoCAD, it uses the Polar coordinate system. It helps to create jobs as well. This coordinate system, in simple terms, uses angles as an assistant to determine direction. The degree angle will increase in the counterclockwise direction as shown in the FIGURE 1.
For example, specifying coordinates like this. For example, starting at point 0,0 (x=0, y=0), continue to draw a line horizontally 10 units long, which is 10<0 (x=10,0 degrees) because the horizontal axis is at 0 degrees, then enter. End. The command will get a horizontal line of length 10 units.
If we want to create a 10 x 20-unit square with straight lines, how do we do it?
Starting at point 0,0 (x=0,y=0), continue to draw a line horizontally, length 10 units, that is, @10<0 (x=10,0 degrees). vertically, length 20 units, @20<270 (y=20,270 degrees), a vertical line of length 20 units.
Then draw a line horizontally, length 10 units, @10<180 (x=10,180 degrees), a horizontal line of length 10 units to the left. And continue to draw a line vertically, length 20 units, that is, @20<90 (y=20,90 degrees) get a vertical line, length 20 units, will get a closed rectangle, size 10 x 20 units.
Do you still remember the 1st Right hand Rule? Today, let’s continue with the rule of the right hand, number 2, before raising your right hand up and clenching your fist like thumbs up (Thumb Up) as shown in the Figure 1.
When we raise our thumbs to be likened to the axis of rotation of both fingertips 4 as a direction of rotation. The direction in which the fist is clenched is Plus + and the direction opposite to the clenched fist is Minus –as shown in the Figure 2.
This rule applies when the UCS is to be rotated in the desired direction.
For example, if the UCS is to be rotated from its normal position, it must be parallel to work on side A as shown in the Figure 3.
We must rotate the UCS to hold the Y axis upright. By using the command UCS select X axis as the axis of rotation, by right hand rule the thumb points in the same direction as the X axis. In the same direction as both fingertips 4 finished, the result is as shown in the Figure 4.
It was found that the UCS is not parallel to the side. A We will have to rotate the UCS again to change the axis. X to the right by using the UCS command, select Y axis as the axis of rotation, according to the right-hand rule, the thumb points in the same direction as the axis. Y The X shift must be set to a negative 90-degree angle because the rotation is in the opposite direction to both fingertips. 4 finished, the result is as shown in the Figure 5.
Found that the UCS is rotated parallel to side A, allowing work on this side. is called the working plane. Try to create a result as shown in the Figure 6.
Have you ever worked with AutoCAD and needed to use calculator came up but have to go out to open more programs interrupt the running time.
This is not difficult, just type a short command (hotkey) QC into the command line, it will open the Quick Calculator tool, or a calculator as shown in the picture, can be used without exiting the program.
Working in 3D with AutoCAD has its own uniqueness. Because the program starts working in a 2D viewpoint from the top (Top view), i.e., only sees only 2 axes of work, namely X and Y from looking down at the workpiece.
Therefore, if you want to work in 3D with AutoCAD, you will need to change the default view to the view showing the Z axis. making it inconvenient to use in addition, to really work We tend to use repeated angles.
The program therefore increases convenience by adding a tool, the Views group, to meet the needs and increase the speed of work as shown in the Figure 1.
Tool details, this group of Views, the first part will be a 2D view in various aspects consisting of Top, Bottom, Left, Right, Front, Back.
Followed by a 3D Isometric Projection or a technical 3D image that can measure the width, length, height, like a 2D image, consisting of
SW Isometric / SE Isometric / NE Isometric / NW Isometric
You may be wondering, right? Isometric abbreviation for each view? what does it mean Let’s see the description.
Four directions of view
In order for us to communicate with others about the direction of looking at any object, we must find references to be used to achieve the same understanding first, for example, we tell people to look to the right. Everyone will understand the same. And turn to look in their own right direction at the same time, saying that we are looking at a 3D object, therefore referring to what people have the same understanding that is the direction itself.
Suppose we place the workpiece and look down from the top plane. (Top view) indicating the direction will be as shown in Figure 2.
That means that the Isometric abbreviation is the name of each direction that is a 45 degree diagonal view toward the workpiece. I tried to create a 3D part, then go to the Views group tool and select each view to start with.
It was found that the change of perspective works according to this principle. Can make us change perspectives quickly. But it will be an angle that is already set (preset), always at an angle of 45 degrees with the XY plane. There will be other tools to help, which will be discussed in the next chapter.
To know the coordinates (Co-Ordinate) of a point (Point) on Shape 2D or Form 3D, use the command ID (Command:ID).
The steps for using the command are as follows:
For example, there is a 2D Rectangle shape as shown in the Figure 1.
If you want to know the coordinates of the lower left corner. Type the ID command into the command prompt as shown in the Figure 2.
After Enter to execute the command select the desired point. For accuracy use OSNAP (e.g., Endpoint). When you click to select a point, ACAD will display the X, Y, Z coordinates immediately as shown in Figure 3.
In the case of a 2D shape, the Z coordinate value = 0 because there is no height value.
If it is a 3D form, it will use the same command and ACAD will display the required X, Y, Z coordinates.