Standardisation, the sizes of paper, types of lines and symbols; dimensions,scale,sketch and diagrams,technical drawin
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The document discusses the standardization and conventions used in technical drawings. It covers paper sizes, line types, dimensions, scales, and the differences between drafts, sketches, and technical drawings. The main points are: - International standards define paper sizes, line types, dimension rules, and other conventions to ensure consistent understanding of technical drawings. - Standard paper sizes are based on the A-series, with A0 being 1 square meter and each subsequent size being half the area. - Dimensions are always shown in millimeters and use standardized symbols, leaders, and arrowheads. - Scales relate the size of an object drawn to its real size, with full, reduction, and enlargement
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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