Drafting

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 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...

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 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...

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...