Common Features Of Mechanical Engineering Graphics

Engineering graphics has certain common features.

• Geometry: Object view from top side, side and from various angles
• Dimensions: Object pictured in standard and accepted units
• Tolerance: Variation for dimensions
• Material: Object item representation
• Finish: Quality of material

Line classification:

Lines are classified as follows from Type A to Type K

Type A: Object outline are represented as thickest line with pencil so softer than HB

Type B: Object dimension, extension, projection are represented with 2H pencil

Type C: Short breaks are represented with 2H pencil

Type D: Long breaks are represented with 2H pencil

Type E: Hidden lines are represented with 2H pencil

Type F: Used for electro technology drawings, 2H pencil

Type G: Center dotted lines are represented with 2H pencil

Type H: Cutting plan are represented with 2H pencil

Type K: Alternative position of the object is represented with 2H pencil

Multiple view & projections:

Following are multiple view and projections.

• Orthographic projection
• Auxiliary projection
• Isometric projection
• Oblique projection

Technical lettering: The way of representing numerical, characters and letters are referred as technical lettering. Engineering graphics utilize Gothic sans serif script format.

Questions:

• What are common features of engineering graphics?
• What are different line styles in engineering graphics?
• What is technical lettering?