SECOND TERM E-LEARNING NOTE
SUBJECT: BASIC TECHNOLOGY
CLASS: JSS 1
WEEK THREE AND FOUR
TOPIC: BOARD PRACTICES AND SCALE DRAWING
DEFINITION OF BOARD PRACTICE
Board practice is the act of learning how to use drawing instrument on drawing board to draw vertical, horizontal, incline lines etc., in order to display good board practice, it is necessary to use the appropriate drawing instruments which includes the following: 1. Drawing board 2. Tee-square 3. Set-square 4.Pair of compasses 5.Divider 6.Protractor 7. HB, 2H pencil 8. Eraser
SETTING UP THE BOARD
Step 1 Place the drawing board conveniently on the table with the square edge to the left-hand side.
Step 2 Place the drawing paper on the board, leaving equal space all round.
Step 3 Place the tee-square on the paper, and gently slide or move the tee-square to the top edge of the paper.
Step 4 Set the top edge of the paper parallel to the edge of the tee-square, with the stock of the tee- square firmly against the edge of the drawing board on the left-hand side.
Step 5. Gently slide the tee-square down without moving the paper.
Step 6 Cut of pieces of adhesives tape to hold the paper in position, and place them over the four corners of the paper.
DRAWING OF LINES
All horizontal lines are drawn with the aid of tee-square, usually from left to right, and rotating the pencil as the line is drawn. This ensures uniform thickness of the line.
The set-square is used sitting on the tee-square to draw upright or vertical lines on the paper. Angled lines are also drawn with the set-square turned in different directions.
POSITIONING OF TITLE BLOCK
Title block is at the bottom right-hand corner of the drawing which consist of the following information (a) Title of Drawing (b) Name of object (c) School (d) Scale (e) Date
The title block should be lettered free-hand in single stroke capitals. The two types of lettering are vertical and inclined. Only one method of lettering should be used.
Read on board practice from Introductory Technology JSS1 by Evans (pg13-17)
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