Technical Drawing: 3D objects (2)

In this link you will find some more difficult & useful 3D objects:

• 3D objects (2)

Hidden lines are important!

EXAM: Graphic expression in technology

Here are some possible exercises:

- All key concepts (in the margins)

- Definitions
- Types of pencils
- Paper size, weight, finish
- Differences between sketches, diagrams, technical drawings (draw / identify them)
- Use of ruler, protractor, triangle and set square (angles, parallel, perpendicular lines...)
- Scales: (angles are the same, but lines are different) / identify enlargement & reduction / draw an object at a different scale / graphic scales / choose the best scale to represent an object
- Annotation: line standardization, symbols, MILLIMETERS, annotation rules in 2D & 3D
- Viewpoints: front, side, plan view (placed correctly), don't forget correspondence between viewpoint lines!
- Draw an isometric view from orthographic views

Good luck!

SKETCHUP: Download & Install

Please find below some useful links to download & install Google Sketchup:

All products:
https://www.sketchup.com/es/download/all#es

SketchUp Make 2017 (Windows 64 Bit) (English)
http://dl.trimble.com/sketchup/2017/en/sketchupmake-2017-2-2555-90782-en-x64.exe


If you don't want to install it on your computer, you can use SketchUp Free in your Web Browser:
https://app.sketchup.com/app?hl=es

Any questions? please drop me an email.

SKETCHUP: Guide to build 3D objects

Please, watch these videos to get an idea of the process you would follow to build your assigned 3D object:

• Solid construction #1
• Solid construction #2
• Solid construction #3

Right-click on the toolbar and add these 2 toolsets (VIEWS & STYLES) to be able to switch viewpoints and material properties (transparency):

VIEWS: (for better results, activate "Parallel projection" in Camera menu)

From left to right: ISO, TOP, FRONT, RIGHT, BACK, LEFT view.

STYLES:

In order to fit the solid in the right position, please make sure you start drawing in the following axis orientation:

(Object 4)

How to draw an isometric view from orthographic views

It's hard, but not impossible, here's a graphical tip:

Place the orthographic views:

Then extend the projections:

Now it's time to practice, click on the link below:
Isometric drawing (RaulTecnologia)

Orthographic Projections

Watch these videos for a better understanding of Projections:

1. European System

2. European System (in Spanish)

3. European System (1st angle projection) VS American System (3rd angle projection)

Now it's time to practice with Diedrom, click on the link below:
http://moebio.com/santiago/diedrom/diedrom.html