Technical sketching in Fundamentals of drawing 1st sem, Lecture notes of Technical Drawing

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TECHNICAL

SKETCHING

• Meaning and

Methods of

Sketching

Objectives:

• Describe the difference between a

sketch and a drawing.

• Describe the procedures used to make

mechanical drawings.

• Can properly draw and sketch.

Concept of SKETCH

• (^) Allows an idea to be expressed quickly in

graphic form

• (^) Is prepared free-hand (without drawing

instruments)

• (^) Is not done to scale, but it respects the rules

of technical drawing as much as possible,

and is made roughly proportional to the

object represented.

SKETCHING

Rough Sketches are the most common recording method. The term “rough” describes the state of the design ideas. It suggests that the designs are incomplete and unrefined. Refined Sketches are refined design ideas. They may not look anything like the original rough sketches. Detailed Sketches communicate size, in addition to the shape and proportion communicated in the first two drawings. It also communicates the information needed to build a model of the product or structure.

Sketching Techniques

• (^) Sketching a Lines

Sketching Techniques

• (^) Sketching a Circle
  1. Set up the diameter
     2. Square in the diameter
        3. Sketch diagonals

TECHNICAL DRAWING

• (^) Serve as a reference to workers, architects or machinists.
• (^) When you are ready to design the details, you make a technical drawing, done with more detail and more accuracy.

TECHNICAL DRAWING

• (^) Presents all the information necessary for the

object’s construction.

• (^) Is made with great precision,
• (^) Requires the use of rulers, compass and

protractor or drafting software.

• (^) Is done to scale, and respects the proportions of

the object represented.

• (^) Respects conventions in the mode of the

representation.

TECHNICAL DRAWING

TECHNICAL DRAWING

can represent things…as simple as a spoon!!!

?DIFFERENCE:

• (^) Sketch: made without drafting tools... Just pencil and paper. Scale is approximate, not accurate, but the sketch should still look like the object.
• (^) Drawing : made with drafting tools... Ruler, set squares, protractor and compass. Scale should be accurate and the drawing carefully made.