Spacing holes in a circular pattern such as around a flange of a pipe is a common machine shop task. The circle on which the holes are located is called the hole circle . To lay out the holes with even spacing, the chordal distance between the holes must be determined as illustrated in Example 22.2.

In the unique case of six equally spaced holes, used quite often in industry, the chordal distance is equal to the radius of the hole circle .

EXERCISES

22.15 Find the chordal distances between adjacent holes for the number of equally spaced holes and hole circle diameter shown in the accompanying chart:

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