Page 38 - CITS - ED - Mechanical

ENGINEERING DRAWING - CITS

Fig 9

Fig 10 Fig 11

Note that at A and C of 11 the centre line are shown, but separated from the view by a short gap.
Information given earlier in this lesson concerning views objects, choice of views, hidden lines, centre lines etc
are applicable for both by drawing with instruments and free hand sketching.
Importance of technical sketching: The importance of free hand technical sketching of machine parts and
components in engineering field cannot be over estimated. Free hand technical sketching is a drawing drawn
with/without the use of any drawing instruments and drawn not to scale.
The presentation of the views should be in good proportion to the extent possibly and by visual identification. Free
hand technical sketching helps the designer in reflecting his thoughts and recording his ideas. Most original ideas
and thoughts are expressed first through the medium of free hand sketching. For verbal explanation free hand
sketching plays a very important role.
Free hand sketching contains all necessary details such as shape and size description.
The Fig 12 shows a chuck key which records the importance of free hand sketching.
Fig 12A shows the `object' for layman's easy understanding and Fig 12B gives a free hand sketch for easy
production with necessary dimensions.
The perfection and proficiency in free hand technical sketching can be obtained only by more practice.

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CITS :Engineering Drawing (Mechanical) - Exercise 3