In the previous blog, we understood unit tools and few draw commands like line and circle.
let us continue with our AutoCAD tutorial – Draw commands.
As we all know An arc is a part of the circumference of a circle passing through some points and with a radius. So to create a curve in our drawing without creating entire circle we use Arc command.
An Arc can be drawn in following methods such as
01. 3 point method
Method 1- 3 point method
In this method, we create an arc by specifying 3 known points i.e. a start point, a random point on the arc, and an endpoint.
Method 2- Start-Center-End method
An arc is part of a circle’s circumference it will have a center and a radius. So we can provide 3 points to create an arc i.e. a start point, then a known center point for the arc, and an endpoint.
Method 3- Start-Center-Angle method
In this method, Instead of providing the endpoint we provide the angle made by an arc at the center. Indirectly commanding the arc to end at a specific point. Remember an arc can have any angle value between 0 and 360 but it cannot have a value of 0 and 360 as it means no arc.
Method 4- Start-Center-Length method
Any arc drawn will have a distance between start point and endpoint known as a chord length. So instead of providing the endpoint, we give an indirect command of the endpoint by providing distance between endpoint.
Here like previous methods we must provide the start point and a center.
Method 5- Start-End-Radius method
This method creates an arc using a start point, endpoint, and a radius. The radius can directly enter or by specifying a point at the desired radial distance.
Method 6- Start-End-Direction method
In this method, we create an arc by specifying a start point, an endpoint and tangent direction at the start point.
Method 7- Start-End-Angle method
This method creates an arc using a start point, endpoint and included angle made at the center. The included angle is the angle made by start and end points at center.
Method 8- Continue method
This method is used to continue creating an arc from the last arc point (Endpoint of the previous arc).
The command for an arc is A↵ and the command for continuing an arc is A↵↵.
The shape of ellipse is just an oblong or an oval, with the major and minor axis.
Methods to create an ellipse are:
1. Axis Endpoint method
2. Center-Axis method
1. Axis Endpoint method
Here we first define any one axis (either major or minor axis) completely using endpoints.
Then we provide the distance of endpoint of other axes from the midpoint of the previously drawn axis.
2. Center-Axis method
In this method, we convert a circle into an ellipse by providing distances of endpoints.
Here first, we provide a center and then specify any one endpoint (same in providing a radius).
Then we provide the distance of another endpoint (forcing circle to transform into an ellipse).
There are 4 ways to draw a rectangle:
1. Co-ordinate method
2. Area method
3. Dimension method
4. Rotation method
1. Co-Ordinate Method
In this method, we first provide a corner point and then we provide co-ordinates of the opposite corner.
2. Area Method
Just like the previous method, first step is to provide a first corner point (using mouse).
Then, instead of providing the location of opposite corner we provide the area of that rectangle.
To this command, the program will ask whether to create a rectangle using length or width as a reference. Select as per your convenience and then input the dimension of your reference and it will generate an appropriate rectangle based on data provided.
3. Dimension Method
Here, after providing the first corner we directly provide the dimensions of length and width.
And in the end, we click and provide a corner so that rectangle can be placed in a proper quadrant with respect to the first corner point.
4. Rotation Method
It is to be used when the rectangle is to be placed at come angle with the origin.
Like all methods mentioned above, the first step is to provide a corner.
Then, instead of providing other corner or dimension we proceed with providing a rotation angle. And then we provide another corner, either by mouse click or any method from above.
Using this command, we can create any polygon ranging from 3 sided to 1024 sides.
Methods to create any polygon are
1. Center method
2. Edge method
1. Center Method
In this method, we create a polygon using a circle.
The first step is to decide the number of sides of the polygon.
then we mark a center and decide whether the circle is to be inscribed (inside the polygon) or a circumscribed circle (passing through all vertices of the polygon). Once decided we provide the radius and program generates the polygon.
2. Edge Method
Here we create a polygon with one of its edge as reference.
The first step is to enter the number of sides. then we enter into the edge command with E↵. Then we provide the first point and the last point of the reference edge. With this data, the program will generate a polygon.
This command is very simple to use. we provide inside diameter of the donut and outside diameter of a donut. Then to place it, we provide center point location either by mouse click or using co-ordinates.
Hope you find this blog useful. Like it? then share it with your friends and comment below for any query. See you at the next blog with new tools. Until then take care and be safe!!
Hi, I am Amish Kapuriya. Currently a student of Structural Engineering at Saraswati College of Engineering at Mumbai. I Completed my Bachelor's Degree in Civil Engineering from St. John College of Engineering and Technology, Palghar, Mumbai, India (2012-2016). I like writing blogs and it is my hobby to understand structures. So you will see many posts from my side, maybe one every couple of weeks.