good sketch

The first thing when  we want to make a good 3d drawing is a good sketch.So it is better to understand and learn how to make the good sketch. Lets we try as below:

1.  Click new file and then choose an icon Standard .ipt

2.  Click sketch icon and choose the origin plane you want to start, i usually start with XY plane.

3.  Example : we need to make the box, so we make the rectangular first in our sketch, and  put it  in the   middle of the center point , and after we need to constraint the vertical and the horizontal line of the sketch ( rectangular) make sure your sketch already constraint , then put the dimension on it.

4. After its done now you can extrude it and the box will appear like picture below.

5. Please remember with the good sketch you have in the beginning, you will not find the trouble in the next if you need to modify it.