TD5/1: SCALES ASSIGNMENT

Exercise

1. (a) Draw the simple key shown in Fig. 1 full size.

(b) Construct a plain scale with an RF of 5:4 suitable for use in the making of an enlarged

drawing of this key.

2. Construct a plain scale of 50 mm 300 mm to read to 10 mm up to 1200 mm. Using this scale, draw to scale a triangle having a perimeter of 1200 mm and having sides in the ratio 3:4:6. Print neatly along each side the length to the nearest 10 mm.

3. Construct the plain figure shown in Fig. 2 and then, by means of a proportional scale, draw a similar figure standing on the base AG. All angles must be constructed geometrically in the first figure. Measure and state the length of the side corresponding with CD.

1. Construct a diagonal scale in which 40 mm represents 1 m. The scale is to read down to

10 mm and is to cover a range of 5 m. Mark off a distance of 4 m 780 mm.

2. Construct a diagonal scale of 25 mm to represent 1 m which can be used to measure m and 10 mm up to 8 m. Using this scale construct a quadrilateral ABCD which stands on a base AB of length 4 m 720 mm and having BC  3 m 530 mm, AD 4 m 170 mm, ABC  120 ° and  ADC 90 ° . Measure and state the lengths of the two diagonals and the perpendicular height, all correct to the nearest 10 mm. Angles must be constructed geometrically.

Oxford Local Examinations (question originally set in imperial units; see Chapter 2 for information not in Chapter 1).

6. Construct a diagonal scale, 10 times full size, to show mm and tenths of a mm and to read to a maximum of 20 mm. Using the scale, construct a triangle ABC with AB 17.4 mm, BC 13.8 mm and AC 11 mm. Oxford and Cambridge Schools Examinations