Lines:

Architectural Drawing Standards
Asme Drawing Standards

There are a number of different lines that you will be required to use in Technical Drawing. The table below shows you the different lines, describes where they are used and give you an example of each line.

AS1100.301-1985 and AS1100.301 Supp 1-1986: Architectural drawing. AS/NZS1100.501:200: Technical drawing – Structural engineering drawing. AS1100.401-1984: Technical drawing – Engineering survey and engineering survey.
Drafting protocol is to use the existing drawing symbols used on the drawing. The Gippsland Water Project RO will determine if the updates to the drawing shall be redrawn with new symbols standards or - if the existing drawing symbols will beused. The drafting provider shall discuss each project.

Type of Line:	Use of line in Technical Drawing:	Example of lines:
Type A - Continuous, Thick	Visible outlines of the drawing.
Type B - Continuous, Thin	Dimension and projection lines, leaders. Hatching on sections.
Type C - Continuous, Thin (freehand)	Break in the object .
Type D - Continuous, Thin (ruled with zig-zag)	Break in the object (Straight)
Type E - Dashed, Thick	Hidden edges.
Type G - Chain, Thin	Center Lines of circles, arcs and center of objects.
Type H - Chain, Thick at each end and thin in the middle.	Cutting plane in sectioning of objects.

Where two or more lines of different type coincide, the following order of priority should be observed:

A series dealing with technical drawing, the other Standards in the series. Drawing This is a free 7 page sample. New drawings shall be created with all features in full size (i.e., 1:1 scale). Standard printed drawing scales such as 1:2 are achieved by inserting the title block in the drawing to the inverse of the printed scale (2 in this case). Scale the title block - not the part!! Only standard drawing scales are acceptable.

(a) Visible outlines and edges.

(b) Hidden outlines and edges.

(c) Cutting planes.

(d) Centre-lines.

(e) Projection lines.

Views:

Selection of views shall be selected according to the following principles:

(a) To reduce the number of views required to fully delineate the information to be specified.

(b) To avoid the need for hidden outlines.

(c) To avoid unnecessary repetition of detail.

Architectural Drawing Standards

Sectioned views:

Sectioning is used to show internal detail or to reduce the use of hidden detail lines that may make the object difficult to recognise. All hidden outlines in the section should be omitted except in special cases.

These types of drawings are Orthogonal's with imaginary lines cutting the object into parts.

Each sectional view or section shall be identified with its appropriate cutting plane, where identified, by inscribing a subtitle below the view or section; e.g. ‘SECTION A-A’, ‘SECTION B-B’.

Cutting planes are to shown using a 'Type H' line with the direction of viewing show by an arrowhead and a letter placed at the tail of the arrow. The cutting plane should pass through the main part of the object.

Hatching:

The cut part of the object is to be shown using with a hatched line (usually at 45°, unless this would make the object more difficult to understand). Where two or more adjacent parts have been sectioned the hatch line should be at different angles.

Angle of Hatching

Sectioning of Adjacent components

Where an object is symmetrical a part section can be used to assist in the clarity of the drawing.

If the object has a web support and the section plane passes along this then the web is not sectioned, although if the section plan passes through it then the web is sectioned (See image below).

Note: In section A-A passes along the web and therefore is not hatched in the side view, although in section B-B the plane passes thought the web and is shown in the bottom view.

Breaks:

Break maybe used to shorten lone objects and will use Type C or Type D lines.

Symbols:

The following symbols are to be used in dimensioning:

Symbol:	Use:
Diameter symbol, this is used to indicate the diameter of a circle.
R	Radius Symbol, this is used to indicate the radius of a circle or arc.
This symbol is used to refer to the object being identified is square and the same size across all surfaces.

Dimensioning, Projection and Leader Lines:

Objects that are drawn in Graphics often need to have dimensions showing the size and angles used to show detail about the component. Dimensions show the length and angle of items and the drawing should include only the measurements require to describe the object.

Projection lines are lines that extend from the object and extend outside the outline of the drawing where possible. These lines should start and extend past the dimension line.

Asme Drawing Standards

As1100 Drawing Standards Free