The making steps
Everyday things like chairs, bags, bottles and toys are all made by people in steps:
- Plan: find the need, think of ideas, draw the best one.
- Choose materials: wood, metal, plastic, cloth, clay. Pick by strength, cost and how easy it is to work with.
- Measure and mark: use a ruler or tape. Measure twice.
- Cut and shape: saw, scissors, file, drill.
- Join: screws, nails, glue, stitches.
- Finish: sand, paint, polish.
- Test and improve.
What is a prototype?
A prototype is the first working model of a product. We make it quickly and cheaply to learn what is good and what is wrong. It may be made of cardboard, clay or scrap wood. It is better to find a mistake in a prototype than in a thousand finished products.
Makers often build a mock-up (a look-alike without working parts) first, then a prototype that really works.
Tools for prototyping
Choose the tool to match the job:
- Measuring and marking: ruler, tape, set square, pencil.
- Cutting: hand saw, scissors, craft knife.
- Shaping: file, sandpaper, drill.
- Joining: hammer, screwdriver, glue.
- Digital tools: drawing apps and 3D printers can make parts from a computer drawing.
Safety rules
- Wear goggles and tie back long hair.
- Keep both hands behind the cutting edge.
- Clamp the work; do not hold it with your hand.
- Tidy up; tell a teacher about any injury.
Test, improve and repeat
Testing means using the prototype as it will be used. In the 3D, the weight shows if the stool tips or wobbles. Write what failed, think why, and change one thing at a time. Then test again. This loop is how real products get better.
Try it
In the 3D, make the stool tall (60 cm) and narrow (20 cm). It tips. Make it wider. Then make it tall but with no brace: it wobbles. Add the brace. What rule do you find?
Key formulas and definitions
- Steps: Plan, Measure, Cut, Join, Test, Improve
- Prototype = first working model, made quickly and cheaply
- Rule from the 3D stool: width at least half the height, or it tips
- Rule from the 3D stool: tall stools need a brace, or they wobble
Worked examples
1. A stool top is 30 cm wide. Cut 4 legs, each 40 cm, from a plank 2 m long. How long is the left-over?
4 × 40 cm = 160 cm. Plank = 200 cm. Left-over = 200 − 160 = 40 cm (a little more is lost in sawing).
2. A stool is 44 cm tall. What is the smallest width so that it does not tip, using the rule "width at least half the height"?
Half of 44 cm = 22 cm. The width must be at least 22 cm.
3. You build a pencil holder and it falls over when full. Name the step you are in and one change.
The Test step. Change one thing: make the base wider or heavier. Then test again.
4. Why make a cardboard prototype before cutting costly wood?
Cardboard is cheap and quick. You can find mistakes in size and shape, change them, and only then cut the costly wood, saving money and material.
Common mistakes
- Cutting before measuring twice. A piece cut too short cannot be made longer.
- Skipping the plan or drawing. You may find the problem only after the material is cut.
- Changing many things at once while improving. You will not know which change helped.
- Ignoring safety: no goggles, loose clothes or holding the work by hand while cutting.