BASICS OF SKETCHING

SKETCHING

Sketching is a basic process in 3D modeling of a component. For any component a sketching is primary thing. For any model it consists of three planes. 

The planes shown above are the three planes of views. The three planes shown are orthogonal in nature i.e., every plane makes an angle 90⁰ with each other. To do sketching we have to select any one plane. We do sketching on a plane. Sketching is a 2D.To make it into 3D we use several options like extrude, revolve, sweep etc,.  In order to do sketching on any plane we have to select a plane and it selects a reference plane along with selected plane in order to make into 3D model.

           The below diagram shows the sketching plane. The sketch plane consists of different sketching options like Line, Circle, Rectangle, Arc, Ellipse, Spline.

The basic drawing options are

1.      Line  -- General line , Tangent line (To draw line between two circles)

2.      Rectangle -- Corner rectangle, Slanted rectangle (For creating rectangle in which direction we want which depends on angle), Center rectangle (For creating rectangle symmetric to both X and Y axis), Parallelogram.

3.      Circle – Center and radius, Concentric (For creating different circles with same centre and different radius) , 3-Point circle (Using 3 points to create a circle)

4.      Arc – 3-Point arc (using three points), Concentric arc, Conic.

5.      Ellipse – Using two points by varying lengths.

These are sketching options, and there are modifying options to modify sketch. They are

·         Fillet – For making smooth line between two connecting or intersecting lines

·         Chamfer – For making chamfers between two lines

·         Constraints – Of all above constraints are very important in making a sketch without any weak dimensions. The different constraints are

1.      Vertical           -- Used for making any inclined line to vertical line

2.      Horizontal       -- Used for making any inclined line to horizontal line

3.      Parallel            -- Used for making any two lines as parallel

4.      Tangent           -- Used for making any line tangent to a circle

5.      Symmetric       -- Used for making any sketch symmetric about any axes

6.      Equal               -- Used for making two lines equal

7.      Perpendicular  -- Used for making two lines perpendicular

8.      Coincident       -- Used for making any point or line coincident to other

There are some other editing options. They are

1.      Mirror – Used to make any duplicate sketch about any axes

2.      Trim   -- Used to delete the unwanted portions of a sketch

3.      Divide -- Used to divide any circle or line in to different parts.

There is other option for creating different complex types of sketches such as polygons, Profiles and stars.

The last option is measuring dimensions of a sketch. The different options are normal which is generally used dimensioning method the other is reference dimensioning.