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Standardisation, the sizes of paper, types of lines and symbols; dimensions,scale,sketch and diagrams,technical drawin
- 2. THE SIZES OF PAPER
- 3. TYPES OF LINES AND SYMBOLS
- 4. HOW TO DRAW DIMENSIONS
- 5. SCALE
- 6. DRAFT, SKETCH and TECHNICAL DRAWING
- 8. TYPES OF LINES AND SYMBOLS
- 10. THE SIZES OF PAPER THE ISO “A” SERIES “ A” Series paper sizes. A0 is a rectangle with an area of 1 m 2 ( square meter). Each format is calculated by dividing the previous format in half
- 11. TYPES OF LINES AND SYMBOLS Different types of lines are used on technical drawing to represent the object. Each one of them has a different function.
- 13. There are International Standards rules about how to draw dimensions. This means that all dimensions are always drawn the same way. Some rules are:
- 14. Draw dimension lines lightly
- 15. Dimensions you show will always be measured in millimetres so you do not have to show units
- 16. . Ø is the symbol used to show a diameter, while R is used to show a radius.
- 17. The arrowheads used on the dimension line the point of the arrowheads should touch the leader lines.
- 20. We usually can’t draw objects with the same dimensions as their real Size
- 21. We often design objects that are bigger or smaller than the paper we draw on. Consequently, we have to apply a scale to the object.
- 23. Reduction Scale : is expressed as a scale of 1:2
- 24. Enlargement Scale : is expressed as a scale of 2:1
- 25. REDUCTION SCALE It is used when the real size of the object to draw is larger/bigger than the paper format. How can you draw an object a reduction scale : To draw an object to reduce scale, divide the measurements by the denominator de scale How to read the measurements on a reduced scale drawing: Measure the drawing with a ruler and multiply the result by the denominator of the scale S = 1:1 S =1:2
- 26. ENLARGEMENT SCALE It is used, when a n object is drawn larger than its real size. small objects, such as electronics components, screws, watch gears etc. How to draw an object using an alargement scale: multiply its measurements by the numerator in the scale How to read the measurements in an enlarged scale drawing: Measure the drawing with a ruler and divide the result by the numerator of the scale S = 1:1 S = 2:1
- 28. TECHNICAL DRAWING A TECHNICAL DRAWING HAS THE SAME INFORMATION AS A SKETCH BUT WE MUST USE RULER, SET SQUARES, A PAIR OF COMPASSES OR A COMPUTER TO GIVE AN EXACT PICTURE