The document discusses assembly drawings and isometric views. It explains that assembly drawings show how parts of a product fit together, and can be drawn as fitted assemblies or exploded views. Exploded views separate the parts to show the correct assembly order. The document then provides rules for drawing isometric projections, including that vertical lines stay vertical and horizontal lines incline 30 degrees, all lines are foreshortened, non-isometric lines are drawn using two connecting isometric lines, and hidden edges are typically omitted.

1. Isometric Views
Ar. Surashmie Kaalmegh
Asisstant Professor
LAD College , Nagpur

4. Assembly drawings
 An assembly drawing shows the
various parts of a product drawn to
show exactly how they fit together.
They are often used for products
such as construction and model kits
or flat-pack furniture, to show the
user how to assemble the parts.
 They can be drawn in two ways.
 A fitted assembly drawing shows
the parts put together, and can be
drawn in 2D or 3D.
 An exploded drawing shows the
parts separated, but in the correct
relationship for fitting together.
Exploded views are usually
drawn in 3D, as illustrated.
 An exploded
drawing

5. Isometric view

23. Rules for drawing the isometric
projection of an object:
 Any line on the object which is
initially vertical appear vertical in the
isometric projection.
 Any line on the object which is
initially horizontal appear to be
inclined at 30 to the horizontal in
the isometric projection.
 All isometric lines (i.e. lines which
are initially either vertical or
horizontal ) are fore shortened by the
same factor. These lengths can be
determined by drawing an isometric
scale.
 The isometric scale is applicable
only for isometric lines and is not
applicable for an inclined line ( non-
isometric line).
 Non-isometric lines are drawn by
first connecting the end points by
drawing two isometric lines and then
drawing the isometric projections of
the two connecting lines to locate the
end points of the inclined line. Then,
the two end points are joined to
obtain the projection.
 Generally hidden edges are not
shown in the isometric projections.
 Orthographic views are initially
drawn, only when necessary.
 No dimensions are shown in the
isometric projection, unless
mentioned otherwise.