AutoCAD – Unit tool and Draw tools

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AutoCAD – UNIT TOOL AND DRAW TOOLS

UNITS (UN↵)

Some of us like to round off to the units to the nearest integer, while others want to be precise up to 3/4/5-decimals. This command controls that!
Before we start any new project we must define the format and precision of our units.
The command for Units is ‘UN ‘.
It controls the display and format of coordinates and angles as well as the orientation of angles.

Unit command window - icivilblogger.com
unit command window

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DRAW Tools

Line (L↵)

Usually, people tend to search for line symbol, click on it and start drawing by providing lengths and angles. As compared to the normal way, use of command line is quicker and better.
Autocad is all about accuracy and speed, that’s when command line and shortcuts come in handy.

You can draw a geometry in three coordinate system
1) Absolute coordinate system (X-coordinate,Y-coordinate + ↵)
Once we enter a command we directly specify the coordinates of next point.
In the absolute coordinate system, the origin is the reference for every point or node.

absolute coordinate system - icivilblogger.com
example of the use of line command and absolute coordinate system

2) Relative rectangular coordinate system (@ ±X-coordinate, ±Y-coordinate + ↵)
As the name suggests, this coordinates system is dependent on previous node or point of reference.
Unlike Absolute coordinate system, this system can have any point of reference other than the origin.

Relative rectangular coordinate system - icivilblogger.com
example of the use of line command and Relative rectangular coordinate system

3) Relative polar coordinate system (@ distance < angle + ↵)
Positive X-axis acts as the reference for measurement of next line.
Angle is measured in the counter-clockwise direction at each node.

Relative polar coordinate system - icivilblogger.com
example of the use of line command and Relative polar coordinate system

Circle (C↵)

A circle can be created in 6 ways using the command line,
i.e. using radius, diameter, 3-points, 2-points, 2tangent with 1 radius and 3 tangents.

1) RADIUS,
This is the default for circle command (C↵), here a circle is defined using the radius provided by a user or the point on an object away from the center.

radius method - icivilblogger.com
Example of a circle with radius method

2) Diameter (D↵),
In this method, a circle is drawn using the diameter specified by a user or the distance between two points.
To enter this mode a user gives command D↵ after entering into circle command C↵.

diameter method - icivilblogger.com
Example of Circle with diameter method.

3) 3-Points (3p↵),
Draws a circle based on three points on the circumference.

Circle with 3 point method - icivilblogger.com
Example of Circle with 3 point method.

4) 2-POINTS (2p↵),
Use this to draw a circle based on two endpoints of the diameter when the value of diameter in unknown.

Circle with 2 point method - icivilblogger.com
Example of Circle with 2 point method.

5) Tangent Tangent radius (t↵),
Draws a circle with a specified radius tangent to two objects.
sometimes these criteria are satisfied by multiple circles, in this case, circles with tangent closest to selected point is drawn.

Tangent Tangent Radius method - icivilblogger.com
Example of Tangent Tangent Radius method.

6) 3 tangents.
This command can only be drawn using mouse and icon, the command line is not applicable here.
this draws a circle tangent to 3 objects.

Tangent Tangent Tangent method - icivilblogger.com
Example of Tangent Tangent Tangent method.

In next blog, we will see more draw tools like Arc, ellipse, rectangle, polygon, and donut.
To see our previous blog Click on introduction-to-AutoCAD

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