2. Using your pencil and your thumb, mark off desired radius from the intersection along each line as shown.

1. Establish perpendicular center lines.

Two-Pencil Method

(Text-Based Instructions):

3. Optional Eraser (Vinyl)

2. Paper (unlined or grid)

1. Graphite Pencil (H, F, or HB)

Complete the practice sheets I will distribute keeping in mind those important point made earlier.

When rotated 360 degrees you will have a complete circle. To sketch an arc simply stop at the desired degrees.

Two-Pencil Method Continued:

Now it is your turn to begin developing your SKILL at Freehand Technical Sketching:

Freehand technical sketching is a skill. And as such, the only way to improve this skill is to practice!

The Activity of Drawing………

“Drawing is more than a manual skill; it involves

visual thought which stimulates the imagination, while imagining provides impetus for drawing.” Francis Ching, 1998

Uses of Freehand Technical Sketching

What is Freehand

Technical Sketching?

1. Sketch two lines perpendicular for center lines

Construction Method:

Points to Remember:

2. Keep SHARP conical point on pencil.

1. Its an Attitude! Think straight line.

Process of Freehand Technical

Sketching:

AND

IT IS:

Radius marked off.

2. Using your pencil and your thumb, mark off desired radius from the intersection along each line as shown.

Construction Method Continued:

Bring pencil here

Keep eye here

Begin Drawing:

a. Keep eyes on “ending point”

b. Bring pencil point to “ending point” without watching movement of pencil (remember, move your whole arm & not at the wrist!).

Rotate paper with free hand

Keep pressure here

4. Use your free hand to rotate the paper while pressing down on the center point pencil.

3. Hold two sharp pointed pencils in your hand as shown below with one pencil located in the center.

Place in center

Two-Pencil Method Continued:

Constructed Square with center lines

3. Sketch lines parallel to the existing lines through each mark you just made.

1. Construction method

2. Scrap Paper method

3. Two-Pencil method

Three methods:

Sketching Circles & Arcs

Position for Left-handers shown, Right-handers begin at the opposite point.

Beginning Point

Begin with a starting “point” and an ending “point.”

When drawing, move whole arm, not just fingers or hand.

4. Rotate paper to fit your comfort position.

Arc

Circle

Radius

Diameter

Circumference

Horizontal

Vertical

Perpendicular

Parallel

Point

Line

Plane

Surface

Square

Rectangle

Triangle

Cylinder

Cube

Vocabulary used in Freehand Technical Sketching

Tangent

5. Sketch arcs from tangent point to tangent point making sure each arc is curved and not flat.

4. Rotate your paper as shown here and align your hand and pencil as shown.

**Fundamentals of**

Drafting

Drafting

"Drawing thus is a natural and necessary

extention of visual thought." Francis Ching

Intersect

Bisect

Tangent

Two-Dimensional

Three-Dimensional

Hold Pencil as though it is an extension of your

index finger.

Process of Freehand Technical

Sketching Continued:

Ending Point

Process of Freehand Technical

Sketching Continued:

Keep your hand relaxed.

Move your whole arm, not your wrist.

Establish beginning & ending points (keep those points light).

Place your pencil point on the beginning point and keep your eyes on the end point.

Draw ALL lines very light until you have the complete object drawn, then darken in.

Freehand Technical Sketching

**Sketching Circles & Arcs**

Construction Method Continued:

Construction Method Continued:

Tangent

Tangent

Construction Method Continued:

Freehand Technical Sketching

Bottom line: quick & accurate COMMUNICATION!

Recording ideas

Expressing opinion

Developing concepts

a cognitive process that involves perceptive seeing & visual thinking.

the act of drawing technical views of objects without the use of any mechanical drawing tools.

Freehand Technical Sketching

**Design and Drafting Technology**

University of Central Missouri

University of Central Missouri

**Freehand Technical Sketching**

**Alphabet of Lines**

Technical drawings are created using freehand, mechanical, or digital means.

Examples of Good and Bad

Straight Line Technique

Methods of Creating Technical Drawings

Levels of Freehand Drawings

Examples of Grid Lines

Used for Sketching

Square

Isometric

Perspective

Creating a Proportioned Sketch

Locating the Center of Squares and Rectangles

**Alphabet of Lines**

**Sketching Circles & Arcs**

Use a scrap of paper with the radius marked on it for sketching circles or arcs

Click on the video to see how to sketch circles or arcs with scrap paper and two-pencil (chopsticks) methods

Adopted from http://tcstube.tcsnc.org

**Sketching Circles & Arcs**

Construction Method with Diagonals:

**Scrap Paper and Two-Pencil**

Methods:

Methods:

Tools Needed for Freehand Technical Sketching……...

**World Freehand Circle Drawing Champion**

**Additional Resources**

**Visualizing a multiview drawing p. 266**

**Drawing Conventions for**

hidden lines p. 270

hidden lines p. 270