PRIN.
OF DRAFTING AND SHOP DRAWINGS - OD1641 - LESSON 1/TASK 3
FIGURE 42.
SOLUTION TO THE ISOMETRIC
DRAWING PROBLEM.
method.
The other method is to use an isometric hole template as a guide.
The
template is much easier and faster to use, but templates are available only in
standard hole sizes. Very large or odd-sized holes may only be drawn by using the
four-center ellipse method.
The four-center ellipse method is presented in figure 43 (on the following page).
When you use this method, be careful that the four centers are
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