graphic communication @ boclair academy. introducing graphic communication @ boclair academy
TRANSCRIPT
graphic communication @ boclair academy
INTRODUCING
graphic communication @ boclair academy
WHAT ARE THEY ?
graphic communication @ boclair academy
SEE SOME EXAMPLES
HOW DO YOU DO IT ?
EXERCISES
WHAT ARE THEY ?
graphic communication @ boclair academy
tangency is . . . . . . A PROCEDURE WHICH
ALLOWS YOU TO INCORPORATE CURVES ACCURATELY INTO YOUR 2D TECHNICAL DRAWINGS.the principles are . . .. . . THE RULES WHICH DICTATE HOW TANGENCY IS DONE
SEE SOME EXAMPLES
graphic communication @ boclair academy
stuff you could not draw unless you understood tangency . .
light bulb
crash helmetbbc 2 logo
mobile phone
bottle
grand prix racing circuit
HOW DO YOU DO IT ?
graphic communication @ boclair academy
There are four common problems you have to learn to deal with. They are . . .
tangent at a right angle
tangent at an acute angle
tangent at an obtuse angle
tangent with two curves
HOW DO YOU DO IT ?
graphic communication @ boclair academy
tangent at a right angle
faintly draw two lines at a right angle to establish
the corner
right angle
from each line, draw a faint line out at a right
angle
measure 30mm along each of these lines
draw two faint lines parallel to the two
original lines
where they intersect, this is the centre of the
arc
set the compass at 30mm and scribe the arc
as shown
complete the tangent with the horizontal and
vertical lines
HOW DO YOU DO IT ?
graphic communication @ boclair academy
tangent at an acute anglefaintly draw two lines at
an acute angle
right angle
from each line, draw a faint line out at a right
angle
measure 30mm along each of these lines
draw two faint lines parallel to the two
original lines
where they intersect, this is the centre of the
arc
set the compass at 30mm and scribe the arc
as shown
complete the tangent with the other two lines
HOW DO YOU DO IT ?
graphic communication @ boclair academy
tangent at an obtuse anglefaintly draw two lines at
an obtuse angle
right angle
from each line, draw a faint line out at a right
angle
measure 30mm along each of these lines
draw two faint lines parallel to the two
original lines
where they intersect, this is the centre of the
arc
set the compass at 30mm and scribe the arc
as shown
complete the tangent with the other two lines
HOW DO YOU DO IT ?
graphic communication @ boclair academy
tangent between two curvesfaintly draw in the
centres of two circlesdraw in the two circles,
each with a radius 20mm
scribe two arcs 60mm from the centres of the
circles
from where they intersect, scribe an arc
40mm radius
now you can line the required arc in heavily
R20
R40
graphic communication @ boclair academy
FINISHED
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