9. Sketching

Class: Technical Graphics - Year 2

Learning Intentions and Success Criteria

Textbook References:

JCTG: Junior Certificate Technical Graphics (O’Callaghan)

UTG: Understanding Technical Graphics (O’Sullivan)

WS: Worksheets

Specialist equipment required for class

• HB, H and 2H pencil

• Pencil sharpener, eraser

• Colouring pencils

• 45, 30 and 60 degree set-squares

• Compass

• Drawing clips or masking tape

• Protractor

• A3 Folder

• Textbook: Understanding Technical Graphics

• iPad

Equipment required at home

• T-square

• Drawing Board

• Internet connection and access to SharePoint

Keywords

• Visualisation
• Approximately
• Parallel
• Vertical
• Horizontal
• Equalateral
• Rectangle
• Hexagon
• Pentagon
• Isometric
• Oblique
• Pictorially
• Cylinder
• Prism
• Pyramid
• Cylinder
• Dimension
• Dimensional
• Shere
• Shade
• Hatch
• Smudge
• Object
• Generate
• Project

Scheme for this topic

Sketching Outlines

• In pairs, answer the following questions:

o Describe the impact of poor spatial visualisation skills

o What jobs involving Technical Graphics interest you and why?

• Sketch a series of parallel vertical and then horizontal lines, freehand, approximately 70mm long and 10mm apart

• Sketch freehand: Square, equilateral triangle, Rectangle, Hexagon, Five pointed star (Pentagon)

• Sketch a freehand circle

• Sketch a freehand cube in Isometric

• Sketch a freehand cube pictorially

• Using isometric grid paper, sketch a freehand cube.

• Using isometric grid paper, sketch a freehand letter L and T

• Using isometric grid paper, sketch a freehand cube. Then draw a circle on each surface

• Using isometric grid paper, sketch a freehand vertical cylinder

• Using isometric grid paper, sketch a freehand horizontal cylinder

• On plain paper draw a vertical and a horizontal circle

• On plain paper grid paper, sketch a freehand vertical cylinder

• On plain paper grid paper, sketch a freehand horizontal cylinder

• Draw freehand sketches of 3 Dimensional objects on JCTG page 77 and page 78

Shading and shadow

• Draw a rectangle and shade it from dark to light (JCTG page 77)

• Draw two squares and shade them from dark to light by smudging and with dots(JCTG page 77)

• Draw and shade the 3D objects (Cube, Prism, Pyramid, Cylinder, Cone and Sphere) by varying the pressure of the pencil

• Draw and shade the 3D objects (Cube, Prism, Pyramid, Cylinder, Cone and Sphere) by using hatch lines

• Use colour to shade a number of 3D objects (Shading with colour worksheet)

• Make free hand sketches of a number of 3D objects and shade them in

• Draw the shadow generated by a number of 3D solids (Shading 3D Objects)

Homework

1. Draw free hand sketches of 3D objects

2. Draw freehand sketches of 3 Dimensional objects on JCTG page 77 and page 78

3. Draw the shadow generated by a number of 3D solids (Shading 3D Objects)