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Types of Lines and Dimensioning a Drawing Standard Grade

Types of Lines and Dimensioning a Drawing Standard Grade. The Importance of Dimensioning Correctly. Drawings need to be accurate. They need to show correct dimensions. Dimensions need to be clear. They must to conform to British Standards so that all people who need

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Types of Lines and Dimensioning a Drawing Standard Grade

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  1. Types of Lines and Dimensioning a Drawing Standard Grade

  2. The Importance of Dimensioning Correctly Drawings need to be accurate They need to show correct dimensions Dimensions need to be clear They must to conform to British Standards so that all people who need to use them understand their meaning: people like Builders Architects Construction Engineers etc

  3. Types of Lines and Their Use a. Outlines (thick and continuous) b. Projection lines, cross hatching lines (thin and continuous) c. Hidden lines and edges (thin short dashes) d. Centre line (thin chain lines) e. Cutting plane line (thick at ends with heavy closed arrows) e b d c a X End Elevation X Section XX The 3 views shown above are drawn in 3rd angle projection: the symbol is shown opposite

  4. Dimensioning Dimension line Dimension (should not rest on the dimension line) Terms Leader line a Closed arrowheads b e When dimensioning a drawing it should be done so that the reader sees the dimension from straight on as at A f or from the right as at B In each case the the dimension is above the dimension line. d c A B Sizes are always shown in millimetres eg 10 unless otherwise stated Gap between the drawing and the leader line

  5. a R O b O d c R Dimensioning Circles and Arcs The symbol for a diameter is R The symbol for a radius is

  6. Chamfer Fillet (normally 45 ) (usually drawn freehand) X X Fillets, Chamfers and Angles

  7. a b d c O O O Dimensioning Round Bars

  8. Add dimensions to your drawing of a small train There should be enough shown sizes to make the toy

  9. a b c d i j O R R e h g f O O This drawing shows where most of the dimensions should be Add the other missing dimensions yourself

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