Engineering Graphic Modelling

5.7

TYPES OF DRAWING

OVERLAY DRAWINGS

required

function

I

1

structure

form

material

dimension

surface

J

properties

achieved

required

function

1

1

structure

form

material

dimension

surface

properties

achieved

Term

Overlay drawing, X-ray drawing.

Use

Drawing of items so that hidden areas and parts can also be seen. In

effect the inner and outer forms are superimposed on each other so

that their relative positions are evident.

Characteristics

Surfaces hiding parts to be drawn are treated as 'transparent', by

showing only the contours.

106