Please carefully see the example above. (The line weights are missing from both drawings in both of the drawings in the example. Please think back how we did line weights in class today - first use 0.2 to trace all the lines, and then for orthographic drawing, you use 0.8 to trace the closest part; and for isometric drawing, you use 0.8 to trace the very out outlines. )
Also, you should pay attention to the layout of the drawings. According to engineering drawing standards, in orthographic drawings, the top view is on the top, the front view being on the left low corner while the side view on the right low corner. And put the isometric drawing at the right side of the orthographic drawings, as an 3-dimemtional reference.
Homework
For the isometric drawings today, you are supposed to put the isometric drawing paper under the grid paper as the reference of the 30 degree lines. Do all the drawings on grid paper.
1. Draw the 3 orthographic views of each object below.
Requirements:
a. Find the most appropriate proportion of the measurements, and a proper size to put onto paper. Draw the seven objects on three sheets of paper. Organize them to look nice. You don't have to draw the isometric drawing, but just the top, front and side views. Notice the layout of the views, and write the view name, just like in the example.
b. Ease all the pencil lines. Leave pen tracing lines only.
2. Do the isometric drawings below. Leave pen lines only! 
a. Carefully copy the drawings above onto one grig paper. You don't have to shade! But draw out the cube dividing lines.
b. Drawing the isometric views according to the measurements of the two objects above.
c. Copy the isometric drawing above. You don't have to write the measurements.
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