ENG DRAWING BASICS
An engineering drawing is a type of technical drawing. It is to fully and clearly define requirements for engineered items. There are several common types of engineering drawing, such as detail, assembly and pictorial drawings.
Drawing Sheet Setup
Drawing Sheets: (Notes)- Engineering drawings are based on a drawing paper size of A0 (largest) down to A4 (smallest). A border is added, plus a title block which can use up a lot of space on a small (A4) sheet.
- Australian (and international) standard projection is 3rd angle. (See Projections)
- The Title Block contains information about the drawing, date, title, who drew it, drawing number, etc.
Drawing Types
Drawing Types: (Notes)Common types of engineering drawings;
- Detail drawing: Usually orthographic and fully dimensioned
- Assembly drawing: Shows several parts together, sometimes 1 or 2 dimensions. Also exploded assembly
- Pictorial drawing: Oblique, isometric, perspective,
- Layouts and diagrams: Circuits for electrical and fluid power, schematic diagrams.
- Orthographic projection
- Section view
Line Types
Line Types: (Notes)- Outlines
- Hidden lines
- Leader lines
- Centre lines
- Dimension lines
- Extension lines
- Break lines
- Cross hatching lines
- Tangent lines
- Motion lines
Abreviations
(http://www.roymech.co.uk/Useful_Tables/Drawing/ABREV.html)
Term | Abbreviation or Symbol |
Centre Line ..On View | |
Centre line ..On Note | CL |
Centre Of Gravity | CG |
Cylinder or Cylindrical | CYL |
Diameter..preceding a dimension | |
Equally Spaced | EQUI SP |
Full Indicated Movement | FIM |
Insulated or Insulation | INSUL |
Least Material Condition..In a Note | LMC |
Least Material Condition..(Geom.Dim) | |
Left hand | LH |
Long | LG |
Machine | MC |
Material | MAT |
Maximum | MAX |
Maximum Material Condition..In a note | MMC |
Maximum Material Condition..(Geom. tol) | |
Minimum | MIN |
Not to Scale (In a note and underlined | NTS |
Number | NO. |
Pattern Number | PATT NO. |
Pitch Circle Diameter | PCD |
Required | REQD |
Right hand | RH |
Round Head | RD HD |
Screw of Screwed | SCR |
Sheet (Drawing Number) | SH |
Sketch (prefix to Drawing Number) | SK |
Socket Head: (Allen key head) | SKT HD |
Specification | SPEC |
Spherical Radius..Preceding dim | SR |
Spotface | SFACE |
Square ..Preceding dim | |
Standard | STD |
Taper.. On Dia or Width | |
Thread | THD |
Thick | THK |
Tolerance | TOL |
Typically OR Typical: The dimension and applied tolerances for this feature are the same for all other features of the same size and shape. | TYP |
Undercut | UCUT |
Volume | VOL |