Technical Drawing
- 2. introduction Technical drawings: Clearly define aspects of engineered items Conform to standards Minimize confusion 1.8ish Build this!
- 3. obstacles between the real world and your drawing We live in a 3-dimensional world. Paper constrains us to 2 dimensions. You cannot easily measure a drawing.
- 4. solutions 3-dimensional objects can be represented in a 2D space by two primary methods: Orthographic Projection Isometric Projection
- 5. orthographic projection Orthographic projection uses multiple views of the subject, from points of view rotated about the subject's center through increments of 90°.
- 6. isometric projection Isometric projection captures the object from an upward angle and disregards perspective This can cause some confusing issues
- 7. dimensioning Dimensions in cooperation with a drawing should provide sufficient information to allow anyone to machine the object. With complex objects involving many dimensions, dimensioning can get messy.
- 8. dimensioning types Parallel dimensioning: Parallel dimensioning consists of several dimensions originating from one projection line.
- 9. dimensioning types Superimposed Running Dimensions The common origin for the dimension lines is indicated by a small circle at the intersection of the first dimension and the projection line.
- 10. dimensioning types Chain Dimensioning Chains of dimension should only be used if the function of the object won't be affected by the accumulation of the tolerances.
- 11. dimensioning types Dimensioning by Co-ordinates Two sets of superimposed running dimensions running at right angles can be used with any features which need their centre points defined, such as holes.
- 12. line styles visible lines - are continuous lines used to depict edges directly visible from a particular angle. hidden lines - are short-dashed lines that may be used to represent edges that are not directly visible. center lines - are alternately long- and short-dashed lines that may be used to represent the axes of circular features.
- 13. why? If you want your idea or mechanism to be seriously considered, submit technical drawing demonstrating the functionality and form.