# Isometric Drawing

## The blending of lines and curves

It is usually only the very simple type of engineering detail that has an outline composed entirely of straight lines The inclusion of curves within the outline of a component may be for several reasons to eliminate sharp edges, thereby making it safer to handle to eliminate a stress centre, thereby making it stronger to avoid extra machining, thereby making it cheaper and last, but by no means least, to improve its appoarance This last reason applies particularly to those industnes which...

## Oblique projection

Oblique projection is enother method of pictorial drawing. It is simpler than isometric but it does not present so realistic a picture. Fig. 6 1 shows a shaped block drawn in oblique projection There are three drawings of the same block in Fig. 6 1. They all show the front face of the block drawn in the plane of the paper and the side and top faces receding at 30 . 49 and 6C on the three drawings An oblique line is one which is neither vertical nor horizontal, and the receding lines in oblique...

## Figure Isometric Dimensions

Isometric drawings may be dimensioned by using either the aligned system or the unidirectional system. Regardless of the system used, the leader lines must be drawn in the same isometric plane as the surface they are defining. The guidelines for the dimensions in the aligned system are drawn parallel to the edge being defined, while the guidelines for the unidirectional system are always horizontal. Figure 53 on the previous page is another example of the unidirectional...

## Figure Solution To Isometric Drawing Problem

Figure 40 on the following page is a sample problem that involves the creation of an isometric drawing from given orthographic views that contain a slanted surface. The slanted surface is dimensioned by using an angular dimension. That presents a problem because angular dimensions cannot be directly transferred from orthographic views to isometric drawings.

## Figure The Basic Reference System For Isometric Drawings

Normally, an isometric drawing is positioned so that the front, top, and right side views appear, as shown in figure 37 on the following page . This may be varied according to the position that the draftsman feels best shows the object. Dimensional values are transferable from orthographic views only to the axis, or lines parallel to the axis, of isometric drawings. Angles and inclined dimensional values are not directly transferable and require special supplementary layouts which will be...

## Isometric projection

In isometric projection, the projection plane forms three equal angles with the co-ordinate axis. Thus, considering the isometric cube in Figure 2.4, the three cube axes are foreshortened to the same amount, i.e. AB AC AD. Two things result from this, firstly, the angles a b 30 and secondly, the rear hidden corner of the cube is coincident with the upper corner corner D . Thus, if the hidden edges of the cube had been shown, there would be dotted lines going from D to F, D to C and D to B. The...

## Figure Showing The Bottom Edge Of A Hole In An Isometric Drawing

To determine exactly if and how much of the bottom edge of the hole should be drawn, locate the center point of the hole on the bottom surface and draw the hole by using the same procedure you used for the hole on the top surface. If the hole drawn on the bottom surface appears within the hole on the top surface, it should appear on the finished drawing. If the hole drawn on the bottom surface does not appear within the hole on the top surface, it should not appear on the finished drawing....

## Figure Isometric Drawing Problem Containing A Slanted Surface

To transfer an angular dimensional view from an orthographic view to an isometric drawing, convert the angular dimensional value to its component linear value and transfer the component values directly to the axis of the isometric drawing. Figure 41 on the previous page illustrates this procedure by showing two angular dimensions that have, been converted to their respective linear values, then showing how these values are transferred to the isometric axis. Normally, a draftsman simply measures...

## The Modern Female Head

Same deal, different head, Proportionwise and placementwise, the structure is basically the same as that of a man. You've still got the skutl jaw combo, and you tick off the horizontal guidelines in the same spots. Now come the differences. Leave off the contour lines of the forehead in the finished drawing. Anything that articulates the bone structure of the face, such as those forehead contour lines, makes her look more masculine, The exception is cheekbones, which are very sexy on women. The...

## Figure Four Center Method Of Drawing An Isometric Ellipse

An isometric hole template may be conveniently used as a guide for drawing the hole size for which it is cut. To align the template for drawing, first draw in the hole center lines, then align the guidelines printed on the template adjacent to the desired hole with the center lines on the drawing. If you are still unsure of how to position the template, draw in the center lines and the major and minor axes of the ellipse as shown in figure 44 on the following page . Then align the template with...