COMMON LINE TYPES (page 5) 1. Continuous Thick (0.5mm) TYPE A 2. Continuous Thin (0.25mm) TYPE B 3. Dashed Thin (0.25mm) TYPE E 4. Chain Thin (0.25mm) TYPE F
LINETYPES Hidden Center Hatch Outlines Text Dimension Lines Leader Lines
To show where dimensions or notes apply. Always end in arrowheads or dots. Arrowheads touch and stop on a line Dots should be within the outline of the object. Long or intersecting leader lines should not be used.
General Points on Drafting Arrows: Triangular and Solid Length = 3 x width Arrows on Dimensions -> 3-5mm Long Arrows showing direction of view -> 7-10mm Long Text Height = Not less than 3mm. Underlining of text is not recommended. Notes of a general character to be grouped together.
SECTIONS AND SECTIONAL VIEWS (page 12 BS308) Hatching is Drawn with Type B (Continuous Thin) Lines, equally spaced at 45º. Preferably not less than 4mm Apart With very small parts, never less than 1mm On adjacent parts, alternate the direction of Hatching. Correct Section Line – Type F (Chain Thin)