Day December 12, 2022

AutoCAD: AutoCAD Coordinate System 2

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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?

FIGURE 1

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

FIGURE 2

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.

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AutoCAD: AutoCAD Coordinate system 1

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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.

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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.

Follow part 2.

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