ZIMSEC · Form 5 · Lower 6
Technical Graphics and Design
5 topics5 with notes
0%
Study this subject topic by topic
Progress is saved on this device. Join free to keep it everywhere.
- Plane geometry: conics, loci and mechanisms Curves formed by cutting a cone with a plane: circle, ellipse, parabola and hyperbola.
- Solid geometry: projections, true lengths and true shapes First and third angle projection; principal views; hidden detail; projection symbols.
- Interpenetration of solids and developments The line of intersection where two solids meet (e.g. a cylinder joining a cone, two cylinders at an angle, a prism through a pyramid). Methods:
- Engineering drawing standards, tolerances and fits Drawing practice follows ISO (and SAZ-adopted) standards for lines, lettering, dimensioning, sections, conventions and title blocks.
- Pictorial projection and perspective Isometric drawing uses true lengths on all three axes; isometric projection uses the isometric scale (lengths reduced to about 0.816 of true length), which is the true projected size.