Page 42 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

– Writing titles and any other notes/details with dates
– Checking the drawings.
Before making a free hand technical sketch of a machine part/component the following points is to bear in the mind.
– Before a graphic idea can be developed is essential that the mental image of it to be defiinite and clear.
– When making free hand multi-views sketches, it has to begin by blocking the overall size of each view by using
very light lines.
– Establish the length, height and width of each view.
– Locate the centre line of the cylindrical features.
– Locate the centres for arcs and circular parts.

– Circular parts and arcs are sketched first followed by horizontal and vertical lines.
– Additional separate views may be sketched rather than complicating views with added lines.
– A machine component can be represented right side up in its natural working position.
– If symmetrical about an axis mostly one half may be sketched.
– Choose a correct scale for the sketch, so that enough space is provided to show all details.
– The rules and methods are same as applicable to multi-views drawn by using instruments.
– Fig 19 shows a model of free hand sketch for the reference.

Fig 19

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CITS :Engineering Drawing (Mechanical) - Exercise 3 CITS :Engineering Drawing (Mechanical) - Exercise 3