Woodworker's Journal 1983-7-3, страница 26

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Special Techniques:

The Butterfly Inlay

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The butterfly inlay, sometimes referred to as a double dovetail or bow-tie, provides a useful and decorative way to control checking and splitting. It can be used as an actual joining device or simply as decoration.

Letting one wood into another is known as inlay or intarsia and the methods of making butterfly inlays are pretty much the same as for other inlay work. The concept of using a butterfly inlay to hold a split together is quite old but the butterflies were generally used to repair splits by being inlaid on the underside of a slab where they were out of sight. The idea of using them as a decorative device is fairly recent.

More than one butterfly is usually needed for a project so it's best to prepare a pattern so that all the butterflies will be alike. A pattern can be cut from hardboard, then laid on the stock and traced around with an awl or knife. A sharp pencil will do but be careful! The thickness of the pencil lines will make a difference in the fitting of the butterfly.

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If the butterfly and the recess into which it fits have vertical sides, the cutting and fitting must be precise. Even a small error will be noticeable. For this reason, inlays are often made with slightly beveled edges, sloping inward from the top surface. This allows for a very close fit of the butterfly into its recess; like a tapered cork in a bottle neck (Fig. 2). But extra inlay thickness must be allowed and care should be taken to insure that the butterfly will contact the recess bottom without crushing the upper corners. The amount of bevel need only be very-slight; about two degrees, and this cut is easily done using a jig or band saw with a tilting table.

Butterflies should always be cut thick enough to protrude slightly above the work surface after gluing in place. After the glue has cured they are then planed flush. Thickness (after planing), can range from V* to Vi inch or more depending on whether they

Be sure to orient the pattern so that the grain runs the length of the butterfly rather than across {Fig. 1). They can be cut using a jig or band saw. Follow slightly outside the pattern line, then clean up to the line with a chisel or file.

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