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**graphic communication @ boclair academy**

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**TANGENCY PRINCIPLES INTRODUCING**

graphic boclair academy

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**TANGENCY PRINCIPLES WHAT ARE THEY ? SEE SOME EXAMPLES**

HOW DO YOU DO IT ? EXERCISES graphic boclair academy

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**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

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**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 graphic boclair academy

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**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 graphic boclair academy

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**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

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**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

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**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

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**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

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**FINISHED TANGENCY PRINCIPLES graphic communication @ boclair academy**

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Graphic Communication

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