Sketching Skills GSMST Engineering Drawing Sketching Skills GSMST

Objectives Tips and Techniques Lettering Patience and practice needed

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.

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.

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

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

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.

Pencil Lead Designation Note: Reverse order below

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.

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

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

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

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

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

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

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?

Sketching Tips Layout of drawing using your pencil for dimensional reference

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

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.

Single Stroke Gothic Lettering

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.

Lettering with Fractions

Sketching Techniques