☰ Contents · Technology

A draughts board and a decorative clock

Lessons 5–6 · 2 lessons · O‘. O. Tohirov, I. Karimov, M. M. Maksimova. Technology (Texnologiya), textbook for Grade 8 of general secondary schools. Ilm Ziyo, Tashkent, 2019
6

Practical work: making a decorative wooden clock

Textbook: pp. 21–24
GoalKnow the sequence of making a decorative wooden clock and the safety rules.
New words
decorative clock · dekorativ soatclock movement · soat mexanizmiclock hand · strelkaglue gun · yelimli pistolet
Explanation

A decorative clock is made from thin plywood and a round wooden base. The numbers 1 to 12 are drawn on plywood, cut with a fret saw, sanded and painted black. A large hole for the clock movement is made in the centre of the round base, with small holes around it for fixing. The movement is glued on, the hands are fitted at the front, and the numerals are glued around the edge at equal intervals. Because 12 numerals sit around a circle, the angle between neighbours is 360° : 12 = 30°. The tip of a glue gun gets very hot, so it is used only under the teacher’s supervision and with gloves; working with an angle grinder and a drill is a job for adults (the teacher or a master), and pupils never switch them on by themselves.

Worked examples
The angle between numerals is 360° : 12 = 30°, so a gap of 3 hours is 3 × 30° = 90°.
When the large hole is made, the wood must be firmly clamped and the hole drilled by the teacher or a master, so the part cannot spin and cause injury.
Class activity

Mark the numeral positions on a paper circle: one numeral every 30°. A protractor or a paper circle folded into 12 parts helps. Then sketch a clock with a different decoration (nails, burnt pattern); burning and hot glue are done with the teacher.

Practice
1
From what material and with what tool are the clock numerals cut?
2
With 12 numerals evenly around a circle, how many degrees are between neighbours?
3
Why must a glue gun be used carefully?
4
What is done after the hole for the movement is made?