Engineering Design and Presentation Basic Drafting Facts and

What is the difference between Sketching & Drafting? o Essentially the difference is that when you are sketching, you ONLY use a pencil and your hand. o The minute you use a tool like a triangle, you are drafting, because a tool helps you draw things more precisely. UNT in partnership with TEA. Copyright ©. All rights reserved. 2

How many views does every object have? o They are six (6) views we could draw, but we only draw three (3). o Top, Front, & Right Side. n We will cover these more in depth later. UNT in partnership with TEA. Copyright ©. All rights reserved. 3

We draw oblique pictorials, of which the front view angle is 900 and the sides are 450. o. Cabinet = Full depth o. Cavalier = ½ depth n We will cover these more in depth later UNT in partnership with TEA. Copyright ©. All rights reserved. 4

We draw isometric pictorials in which all of the views are drawn at 300.

Different lines we could draw. o There actually many more, these are just the

Drafting Tools & The Uses 7 UNT in partnership with TEA. Copyright ©. All

Straight Edge Guides Drafting Arm o Purpose is to line up drawings and keep

Templates Ellipse Template o Quickly and accurately draw objects that are drawn often. o There are MANY more, each for it’s own use. o Examples: architectural, landscape, electronics, etc. Circle Templates 9 UNT in partnership with TEA. Copyright ©. All rights reserved.

Drawing Mechanical Pencils (2). 5 mm &. 7 mm Eraser Shield o Mechanical Pencils: for drawing, use the. 5 mm for all general work. Use the. 7 mm for darker or finished work. o. 5 mm is the “work horse”keep all lines light until you are finishing it up. o Eraser Shield is for erasing parts of the drawing. It will help keep you from erasing AMES Lettering Guide the parts that are correct. o Lettering Guide is used to create guide lines for lettering. 10 UNT in partnership with TEA. Copyright ©. All rights reserved.

Irregular Curves Flexible Curve o Used to help draw circular items. o Examples: ellipses,

Clean Up Tools o Used to erase mistakes. o Used to clean off your drawing & work station. Eraser Brush n ALWAYS clean up behind o NEVER use just your hand to clean up or yourself! Leave the you will smear the station as clean, or lead! cleaner, than when you used it! UNT in partnership with TEA. Copyright ©. All rights reserved. 12

Bow Compass Layout Tools o Compass is used to draw precise circles, arc, etc. o Can also be used to help layout marks. Divider o Divider is used to get precise measurements, & transfer measurements. 13 UNT in partnership with TEA. Copyright ©. All rights reserved.

Triangles 30/60 Triangle “Tall & Skinny” o Used to draw perfectly square lines with the straight edges tools. 600 o Each has the most commonly used angles required. 300 45 Triangle “Short & Fat” o When combined, they can get you all of the other angles you might need. 450 14 UNT in partnership with TEA. Copyright ©. All rights reserved.

Drafting Scales o Used to draw objects precisely or exactly. o Engineers: deals primarily with inches and based on 10 “parts”. o Architectural: deals with feet & inches. o 16 is regular ruler. All other the fractions represent a foot or 12”. o Metric based on MM & 10 “parts”. o Refer to lessons on Scales for more information. 15 UNT in partnership with TEA. Copyright ©. All rights reserved.

Summary o You need to know your tools and how to correctly use them. o Yes, Auto CAD is the most used tool, but you must understand how the process works. Then, you’ll become a better drafter. o Also, very often you maybe called upon to draw something with no computer around, so you will be better prepared if you know these tools and how to use them. 16 UNT in partnership with TEA. Copyright ©. All rights reserved.

Remember to…. o Use this information to complete the “ABC” Review Sheet for this

BONUS: Want to learn more about the history of drafting? o Essentially, drafting has been around since man first started drawings. o Write a 1 page synopsis about what you learn about the History of Drafting. o This website has an excellent explanation of the History of Drafting. http: //www. uen. org/utahlink/tours/tour. View. C ategory. cgi? category_id=21312&tour_id=1 4435 18 UNT in partnership with TEA. Copyright ©. All rights reserved.

Textbook Texas approved publishers are: o Goodheart-Willcox o Delmar Learning o Prentice Hall n All have a companion workbook’s with more problems. I recommend using it, or any other approved textbook, i. e. , if you are ATC or Tech. Prep and must teach using local colleges textbook. 19 UNT in partnership with TEA. Copyright ©. All rights reserved.