1. graphic communication @ boclair academy

2. TANGENCY PRINCIPLES INTRODUCING
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3. TANGENCY PRINCIPLES WHAT ARE THEY ? SEE SOME EXAMPLES
HOW DO YOU DO IT ?
EXERCISES
graphic boclair academy

4. TANGENCY PRINCIPLES WHAT ARE THEY ? 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
graphic boclair academy

5. TANGENCY PRINCIPLES SEE SOME EXAMPLES bottle grand prix racing circuit
stuff you could not draw unless you understood tangency . .
bottle
grand prix racing circuit
bbc 2 logo
mobile phone
crash helmet
light bulb
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6. TANGENCY PRINCIPLES HOW DO YOU DO IT ?
There are four common problems you have to learn to deal with. They are . . .
tangent at a right angle
tangent at an obtuse angle
tangent at an acute angle
tangent with two curves
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7. TANGENCY PRINCIPLES HOW DO YOU DO IT ? tangent at a right angle
where they intersect, this is the centre of the arc
complete the tangent with the horizontal and vertical lines
draw two faint lines parallel to the two original lines
set the compass at 30mm and scribe the arc as shown
from each line, draw a faint line out at a right angle
measure 30mm along each of these lines
faintly draw two lines at a right angle to establish the corner
right angle
graphic boclair academy

8. TANGENCY PRINCIPLES HOW DO YOU DO IT ? tangent at an acute angle
where they intersect, this is the centre of the arc
complete the tangent with the other two lines
draw two faint lines parallel to the two original lines
set the compass at 30mm and scribe the arc as shown
from each line, draw a faint line out at a right angle
measure 30mm along each of these lines
faintly draw two lines at an acute angle
right angle
graphic boclair academy

9. TANGENCY PRINCIPLES HOW DO YOU DO IT ? tangent at an obtuse angle
where they intersect, this is the centre of the arc
complete the tangent with the other two lines
draw two faint lines parallel to the two original lines
set the compass at 30mm and scribe the arc as shown
from each line, draw a faint line out at a right angle
measure 30mm along each of these lines
faintly draw two lines at an obtuse angle
right angle
graphic boclair academy

10. TANGENCY PRINCIPLES HOW DO YOU DO IT ? tangent between two curves
from where they intersect, scribe an arc 40mm radius
now you can line the required arc in heavily
scribe two arcs 60mm from the centres of the circles
draw in the two circles, each with a radius 20mm
faintly draw in the centres of two circles
R40
R20
graphic boclair academy

11. FINISHED TANGENCY PRINCIPLES graphic communication @ boclair academy
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graphic boclair academy