diedric system. 2.4 diedric system the diedric system represents the objects using a perpendicular...
TRANSCRIPT
DIEDRIC SYSTEM
2.4 Diedric system
2.4 Diedric system
The diedric system represents the objects using a perpendicular projection on a plane
2.4 Diedric systemThe projection or VIEW consists of drawing just what
we see when we are perpendicular to the object and to the plane
Page 28
2.4 Diedric systemTo define an object we only need 3 views, floor, front and profile:• Floor view: from the top of the object• Front view: facing the object• Profile view: from the side
Profile view
Floor view
Front view
Front view
Floor view
Profile view
• Draw the left profile, floor and front view of your pencil case.
2.4 Diedric system
Diedric Rules• The front is usually indicated with an arrow• The views distribution
– The front is always on top of the floor– The profile is situated the other way round, that is,
the left profile is situated on the right
front
floor
Left profile Right profile
floor
front
2.4 Diedric systemRemember:• The same height: the object has the same height on the floor
and on the profile views• The same width: on the front and on the floor views• The same depth: on the floor and on the profile views
2.4 Diedric system
• Exercise: Draw the front, left profileand floor views of the class chair
2.4 Diedric system
• Exercise: Draw the front, profile and floor views of the class chair
2.4 Diedric system
Where do we have to be situated to see these objects like circles?
2.4 Diedric system
2.4 Diedric systemExercise 11: Complete the views of the following objects
Page 31
2.4 Diedric systemExercise 11: Complete the views of the following objects
2.4 Diedric systemExercise 11: Complete the views of the following objects
2.4 Diedric systemExercise 11: Complete the views of the following objects
2.4 Diedric system
• Non visible lines: when we know there is a hidden line we have to draw it using a discontinuous line
hidden line
2.4 Diedric system
• Insert video
2.4 Diedric system
Activity: draw the front, floor and right profile views of this figure colouring each face in one colour.
2.4 Diedric system
Activity: draw the front, floor y left profile views of this figure colouring each face in a different colour.
2.4 Diedric system
• Exercice: draw the right profile, front and floor views of these objects
2.4 Diedric system
2.4 Diedric system
2.5 Marking and standardizing
• The standardizing is the group of rules that defines technical drawing.
• For example:– For paper size we use the DIN rule: A0,A1,A2…– The lines are:
• Thick continuous lines: are used to outline objects• Thick discontinuous lines: indicate hidden lines• Thin continuous lines: are used for auxiliary measures and
reference lines
2.5 Marking and standardizing
Measure line
Auxuliary Line
Measure
Reference line
2.5 Marking and standardizing
Outside thick continuous line
Thick discontinuous line for a hidden edge
2.5 Marking and standardizing
Marking : indicating the real dimensions above the object
2.5 Marking and standardizing
• Activity: draw these views indicating which rules are broken
CorrectWrong
CorrectWrong
CorrectWrong
CorrectWrong
2.5 Marking and standardizing.
• The measure lines:– We place them parallel to
the edge and slightly separated
– They are limited by the auxiliary lines
– The arrows are thin and enlongated, they go from one side to the other
Marking follows some rules: see page 37
2.5 Marking and standardizing
• Auxiliary lines– We place them
perpendicular to the measure lines
– They cross the measure line a little bit
– They never cut the measure line
2.5 Marking and standardizing
• Activity: draw these views indicating which rules are broken
CorrectWrong
2.5 Marking and standardizing
• The measures:– We indicate the real measure
in milimetres, but “mm” is never written
– They are placed above the measure line, never under it
– We only use the extrictly necessary measures
2.5 Marking and standardizing
• Activity: draw these views indicating which rules are broken
CorrectWrong
• Activity: Draw the front, left profile and floor views of your pencil marking the measures
2.5 Marking and standardizing
• Let’s revise the important terms
• 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
Unit 2.Drawing applied to technology
Vocabulary • Paper size • Cellulose• Clay, graphite, lead• Hard and soft pencils• Erasers, technical pencil• Sixty and forty-five degree rules• Sketch, draft, free hand drawing, measures• Scale, real and drawn size, reduction, enlargement scales• To be reduced 100 times…• Length, height, width• Long, high, wide.