Section Lines In Engineering Drawing
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For example to illustrate how a petrol engine works the cylinder block can be cut in half and the cut faces are invariably painted red.
Section lines in engineering drawing. Sectioning or crosshatching lines. Centerlines indicate a circular feature on a drawing. The diagonal lines on the section drawing are used to indicate the area that has been theoretically cut.
Section lines are very light. These simple lines play a very important role in the accurate interpretation of engineering drawings. When sketching an object or part that requires a sectional view they are drawn by eye at an angle of approximately 45 degrees and are spaced about 1 8 apart.
The lines are thin and are usually drawn at a 45 degree angle to the major outline of the object. The following slides will help show the several methods or types of section views visualizing the cutting plane. For most engineering drawings you will require two thickness a thick and thin line.
A thin line is used for hatching leader lines short centre lines dimensions and projections. Last updated on wed 16 sep 2020 engineering drawing. A section view is a view used on a drawing to show an area or hidden part of an object by cutting away or removing some of that object.
It is best to use the symbol for the material being shown as a section on a sketch. Sections normally comprise of two parts firstly the section cut indicator with identification. When you go to a museum you often see artefacts that have been cut up.
In 2d most circular features look exactly the same as features with non circular geometry. The general recommendations are that thick lines are twice as thick as thin lines. In engineering drawing cross hatching is the equivalent of painting something red.
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