Unit 2.Drawing applied to technology. Unit 2.Drawing applied to technology. What are we going to see in this unit? 2.1 Drawing tools and how to use them 2.2 Drafts and sketches 2.3 Drafting scale 2.4 Diedric system 2.5 Marking and standardizing. 2.1 Drawing materials and instruments.
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The more clay it contains the harder the lead will be. We use letter H for hard pencils and letter B for soft ones.
Hard: H Soft: B
Theyholdgraphite lead. They can beusedfortechnicaldrawingifusedwitha soft lead.
Erasers are made of rubber; theyabsorb
graphite and erase it.
The sketch: Itis a free handdrawingtoo, butitincludesthemeasurements, thereforeit shows the precise size and a shape similar tothe final drawing.
A model uses a reduction scale
The diedric system represents the objects using a perpendicular projection on a plane
The projection or VIEW consists of drawing just what we see when we are perpendicular to the object and to the plane
To define an object we only need 3 views, top, front and profile:
Where do we have to be situated to see these objects like circles?
a discontinuousline of mediumthicknessfor a hiddenedge
Marking : indicating the real dimensions of the object