Pivot Boring

Figure 11-16. Using the pivot method to bore radial holes into the edge of a circular workpiece.

Radial holes into the edge of circular workpieces can be bored accurately by working as shown in Figure 11-16. This procedure is known as pivot boring. A strip of wood, sized to fit the table slot and with a short nail driven through it at an approximate midpoint, is clamped to the table so the nail is aligned with the spindle's center. The workpiece, marked off in degrees for the holes that are required, is centered over the pivot nail and rotated to position it for each hole. Set the depth control to limit quill extension.

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