Center Lines

Center lines consist of thin (light), broken lines of alternating long and short dashes. They are used to identify the centers of symmetrical objects such as a column, wall, or window. Center lines are also used to indicate the center of a whole circle or part of a circle and to show that an object is symmetrical about a line (Figures 3.5A and B). The symbol is typically drawn as such: (C/L). Center lines are symmetrical on the axis of circular features and are also used to locate centers of windows and door symbols on floor plans.

Figure 3.3B Hidden lines here represent an undercounter appliance and hung kitchen wall cabinets.

Figure 3.3A Hidden lines represent invisible edges and surfaces—in this case, blocking hidden behind a wall.

Figure 3.3B Hidden lines here represent an undercounter appliance and hung kitchen wall cabinets.

DESIGNER'S NOTES:

t. SEE DTTML 18761-3 FOR NOTES.

7. SEE DETAIL iftMi-2 FOP ELEVATIONS.

i SEE DETAIL 16761-15 FW COLOR CODING Of BOXES.

DESIGNER'S NOTES:

t. SEE DTTML 18761-3 FOR NOTES.

7. SEE DETAIL iftMi-2 FOP ELEVATIONS.

i SEE DETAIL 16761-15 FW COLOR CODING Of BOXES.

Figure 3.4A Sectional lines add emphasis to the walls in this illustration.

W.C. CONNECTION DETAILS

Figure 3.4A Sectional lines add emphasis to the walls in this illustration.

The long dashes of center lines may vary in length, depending upon the size of the drawing. Center lines should begin and end with long dashes, and they should not intersect at the spaces between the dashes. They should extend uniformly and distinctly a short distance beyond the object or feature of the drawing unless a longer extension line is required for dimensioning or for some other purpose. Very short center lines may be unbroken if there is no confusion with other lines.

Symmetry lines are center lines used as axes of symmetry for partial views. To identify the line of symmetry, two thick, short parallel lines are drawn at right angles to the center line. Symmetry lines are

used to represent partially drawn views and partial sections of symmetrical parts. Symmetrical-view visible and hidden lines may be extended past the symmetrical line if this improves clarity.

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