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Lecture 7: Isometric drawing practice II

ENGR 0101-04

Engineering Graphics

Spring 2018

Midterm

Nov2 Midterm2

120 Minutes

5 short question (Multiple choice)

1 Multi-view drawing

3 3D Isometric drawing

1 extra credit

Isometric drawing

Isometric drawing Let’s use face method

Isometric drawing Front view or top view didn’t has a good face to start. So start with right view

Isometric drawing This is a complete face because the other lines are hidden line.

Isometric drawing Draw a line from the selected face to front view to know there relationship and where is the comment line

Isometric drawing The red one is the comment line

Isometric drawing So we can draw the other face

Isometric drawing Next, from the face we got in front view, we can draw a line again to get another related face

Isometric drawing We finish the base, let’s get the top part. With the similar procedure

Isometric drawing Since we don’t see any other face that share a comment line clearly, let’s try to locate where the left part is:

Isometric drawing Draw the 3x3 face

Isometric drawing After we got the 3x3 face, we have another comment line

Isometric drawing These lines will be blocked by the white object

Isometric drawing Therefore, clear them

Isometric drawing Draw the final face

Isometric drawing Of course, most line will be blocked by the right side

Isometric drawing Delete those

Isometric drawing Finally, draw those holes

Isometric drawing Draw the square

Isometric drawing Make a dot on the mid point

Isometric drawing Draw each arc by seperately

Isometric drawing Complete the circle in isometric view

Isometric drawing Clear the referenced square

Isometric drawing Draw the blue circle now, but remember this blue circle is NOT located in the center

Isometric drawing Draw the reference square

Isometric drawing Draw the circle

Isometric drawing Delete the reference square

Isometric drawing Delete the circle that blocked by the right side

Isometric drawing Solution

Isometric drawing

Combine method

Isometric drawing

3 block combine

Isometric drawing

First, draw the blue block. In the right view, this face is representing the blue block because all of its line are solid line. It means it is not blocked by other faces. Therefore, it is located at the right side

Isometric drawing

Draw the simple triangular block, remember to draw the horizontal/vertical line first

Isometric drawing

Draw a line between its start and end point.

Isometric drawing

Finish the 2unit width block

Isometric drawing The green block is 1 unit inward

Isometric drawing the green block is a simple rectangular block

Isometric drawing These lines are blocked by blue block.

Isometric drawing Therefore, delete them

Isometric drawing

Final block

Isometric drawing 2 unit away from the blue block

Isometric drawing Draw the triangular block

Isometric drawing Delete the line that is blocked by the green block

Isometric drawing

Face method

Isometric drawing Start with front view’s large face this time

Isometric drawing Comment line here

Isometric drawing Another Comment line here

Isometric drawing Delete unseen line

Isometric drawing This part didn’t look right because something should be here to complete the block. However, we didn’t see anything in the right view. Therefore, the only reason is all the lines are blocked by the yellow face

Isometric drawing Draw the yellow face

Isometric drawing Final face is here, and the depth is 1 unit as you can see the hidden line there

Isometric drawing But most the lines are blocked by the orange face. Therefore, only 1 small line left

Isometric drawing Draw the holes, and here is the solution.

Isometric drawing

Combine method

Isometric drawing

Yellow block first

Isometric drawing Yellow block first

Isometric drawing Next, blue block

Isometric drawing Of course, remember draw horizontal/vertical line first, and then diagonal line

Isometric drawing Delete extra line

Isometric drawing Finally, get the hole

Isometric drawing

Use combine method to separate 3 blocks

Isometric drawing

Blue block is straight forward

Isometric drawing For the hole in orangle block, use the same method, but only draw a half circle

Isometric drawing

Isometric drawing Delete unseen part

Isometric drawing

Isometric drawing This object has a lot of diagonal line. Flat face method will be difficult to use. Therefore, tracking method will be better here.

Isometric drawing First start with some easy part

Isometric drawing Next, pick a point you want to start with

Isometric drawing And your goal is draw this purple line

Isometric drawing Based on the top view and front view, you know the purple line is 1.5 unit to the front, 4 unit down, and 1.5 unit to the left

Isometric drawing Select another line you want to draw. This time is a 2.5 unit horizontal line, pretty straight forward.

Isometric drawing This time, you got the start and end point, so just draw a line to connect them

Isometric drawing Based on the front and top view, we know this green face is a flat face

Isometric drawing Since we got diagonal face, we need tracking method again

Isometric drawing The line here is 1.5 unit back

Isometric drawing The line is 0.9 unit back, 0.9 unit to right, and 2 unit up

Isometric drawing These line are horizontal to the left

Isometric drawing Complete the red box

Isometric drawing Next, draw the final block

Isometric drawing Final line here

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