1. Sketching Skills GSMST
Engineering Drawing
Sketching Skills
GSMST

2. Objectives
Tips and Techniques
Lettering
Patience and practice needed

3. Sketching
Although most final drawings are computer generated, initial and freehand sketches are vital to the design process
Freehand does not mean messy. Sketches should display an adequate amount of detail, and any pertinent notes/comments pertaining to the drawing
For instance, if a line is supposed to be straight, make it as straight as possible. A square will not pass for a circle.

4. Sketching
Sketching is a rapid, freehand method of drawing without the use of drawing instruments. Sketching is also a thinking process and a method of communication.

5. Sketching This is not artistic sketching, but technical sketching
Emphasis will be on sketching geometric figures to represent features of objects
Medium grade pencils work best for sketching
All lines should be dark enough to standout from the page

6. Engineering Drawing Rules
Always use a Pencil.
Make all lettering the same size.
Use Engineering or Drafting Paper.

7. Pencil Techniques
The best pencil for lettering on most surfaces are the H, F, and HB grades.
Hold your pencil in the position shown. It should make approximately a 60o angle with the paper.

8. Pencil Lead Designation
Note: Reverse order below

9. Sketching Tips: General
Relax and draw in a direction comfortable to you
Mark end points of the lines to be sketched and draw between them
Draw long lines as a series of short ones
Use grid paper when available
Follow sketching and text conventions
Do NOT use a straight edge to draw lines!
We will be doing a lot of freehand sketching. T-square, triangles and straight edges will be added later. Do expect neat and clear work. THIS TAKES GOOD TECHNIQUE AND PRACTICE.

10. Sketching Tips
Sketching straignt lines does not mean they have to look like they are machine drawn.

11. Sketching Tips: Construction Lines
Use construction lines
Begin by drawing bounding boxes with construction lines
Make construction lines much lighter and thinner than finished lines
Identify the major features and overall dimensions
Leave construction lines on the sketch

12. Drawing Circles Two methods for sketching circles
Box in diameter and mark radius
Draw center-point lines and mark radius

13. Sketching Tips: Miscellaneous
Do not shade the drawing – this is not pencil sketching
Title information is required
Keep views aligned (very important)
Draw neat circles – change page orientation if needed

14. Sketching techniques Use very light construction lines
“Box in” the rough outline of the object
Darken only the lines you wish to keep
Clean up the edges and rough spots

15. Box In Technique
Boxing in the outer dimensions is often the first step in producing a sketch

16. Sketching Tips
If you don’t have a ruler, you can estimate dimensions using your pencil when sketching
Always keep your pencil at arms length. Why?

17. Sketching Tips
Layout of drawing using your pencil for dimensional reference

18. Lettering
The style of engineering lettering we will use in this course is Single Stroke Gothic Lettering
An example of the characters is shown on drawing numbers 1 and 2
Notice that only capital letters are demonstrated, since we will use only capital letters on drawings

19. Lettering Notes Lettering Guidelines – Handout Lettering Styles
Shape of Letters
Order of Drawing Lines
Character Uniformity
Spacing
Overview:
Lettering must be neat and readable – Should use all capital letters
Tools
Traditional hand sketching
Computer Aided Drawing (a large industry producing computer packages they may have heard of in AutoCad, ProEngineer, SolidWorks)
Media (how we record)
Paper – helpful to know about Standard Sizes (Table 1) and Title Blocks
Alphabet of lines - examples of line types.

20. Single Stroke Gothic Lettering

21. Lettering – Vertical Gothic Font
Tell the students that this guide to good lettering is on the website.
Tell them that they should use all caps for notes on drawings and the letters should be ~1/8 inch or 3 mm high.
The reason for using all caps is that someone could reduce the size of their original drawing on the copy machine.
The capital letters can be reduce by 50% and still be readable.
We expect good quality lettering and the lettering to be done in vertical gothic font.

22. Lettering with Fractions

23. Sketching Techniques