2. INTRODUCING

3. WHAT ARE THEY ? SEE SOME EXAMPLES HOW DO YOU DO IT ? EXERCISES

4. 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

5. SEE SOME EXAMPLES stuff you could not draw unless you understood tangency.. light bulb crash helmet bbc 2 logo mobile phone bottle grand prix racing circuit

6. 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 acute angle tangent at an obtuse angle tangent with two curves

7. HOW DO YOU DO IT ? 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

8. HOW DO YOU DO IT ? tangent at an acute angle faintly 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

9. HOW DO YOU DO IT ? tangent at an obtuse angle faintly 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

10. HOW DO YOU DO IT ? tangent between two curves faintly draw in the centres of two circles draw 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

11. FINISHED