OBJ #32– Define sketching.
• When you first get an idea for something you want to create, you may draw it roughly…without using instruments or accurate scales. This is called a conceptual sketch.
• conceptual sketch - A rough drawing, usually freehand, where instruments and tools are not used.
OBJ #33– Define lettering.
•Lettering – a process of forming standardized letters in technical drawings.
OBJ #34– Explain why lettering is important.
•Legible!•Uniform, standardized, consistent. •Unclear writings result in:
•Miscommunication•Wasted time•Costly errors
• Lettering is drawn freehand and are drawn within light horizontal guidelines.
• All lettering uses upper case letters. Lower case letters are almost never used in technical drawings.
• There are three aspects of good lettering: proportions and forms of the letters, composition and spacing, and practice.
• http://www.youtube.com/watch?v=Ky5p‐L_m6BQ&list=TLYG3KqUAAbEnu5A8qkgYHKwqa82OpX3DO
• https://www.youtube.com/watch?v=byQy0w5vr‐A
OBJ #35– Define technical drawing.
Technical Drawing - Creating plans that visually communicate how something is constructed.
• Presents all the information needed for the object’s construction.• Is done to scale (proportion)
People who also use it:
‐ Architects
‐ Engineers
‐ Drafters
‐ Fashion designers
‐ Business owners
‐ Inventors
‐ Illustrators
‐ Landscape designers
‐ Interior designers
‐ Product designers
‐ Software designers
‐ Graphic designers
‐ Industrial designers
‐ Construction workers
‐ Plumbers
‐ Electricians
‐ Contractors
‐ Machinists
‐ Anyone who builds or creates things!
OBJ #36 – Know the tools required for technical drawing.
• T-square – creates 90o horizontal & vertical lines.
• 45-90 Triangle – has two 45o angles and a 90o angle.
• 30-60-90 Triangle – has a 30o, 60o, & 90o angle.
OBJ #37 – Define orthographic projection.
Orthographic projection ‐Representing a 3D object in 2D using multiple views.
OBJ #38 – Identify each view of a technical drawing.
•Front ‐ shows the most detail, contour, and/or features.
•Top – the top of the object
•Side – the right side of the object
OBJ # 40 – Define dimensions.
•Dimensions – used to show size and location.
Dimension Line
Dimension Line
OBJ # 41 – Properly draw dimensions.
• Include extension lines!• Arrows on ends.• Measurement in middle.
Dimension Line
Dimension Line
Extension Line
Small Space
OBJ #42– Compare sketching to technical drawing.
• Ideas to be expressed quickly – rapidly drawn.
• Is prepared free-hand.• Is not done to scale.
• Serve as an official standardized reference to engineers.
• Uses drawing tools.• Accurately communicates
ALL information. • Absolutely clear, very little room for interpretation.
Sketch VS Drawing