If a frame and pane! are akeady assembled, its difficult to rout a chamfer on the frame because the panel gets in the way of the pilot on the chamfering bit.

To deal with this problem, I used a "V-groove" bit instead. And to guide the bit, I made an auxiliary base and special 1 V-wide guide from V hardboard (Fig. 1).

The primary function of this guide is the same as that of the pilot on a chamfering bit. It keeps the bit a uniform distance from the edge being chamfered. But the guide also stops the chamfer a uniform distance f^A") from the corners-

To make the chamfer, just adjust the depth of the bit to cut a Vs"-wide chamfer. The guide will maintain a uniform chamfer and stop the cut exactly 3A" from the corners (Fig. 2).

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