Using a Jointer (continued)
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Surfacing Problem Stock

Figure 6-14. Cupped boards, if they are narrow enough and the cup is not extreme, can be jointed in this manner.

Boards with defects such as cupping or wind must have special attention if they are to be surfaced safely and with a minimum loss of stock.

A cupped board is dished across its width as shown in Figure 6-14; its high points provide some bearing surface when the board is placed concave-side-down on the table (Figure 6-15). Keep the board as level as possible during the first pass; after that it will have a "flat" to provide bearing surface.

Figure 6-15. The high points provide some bearing surface when the cupped board is placed concave-side down on the table.

An optional procedure to use when the thickness of the stock permits is to resaw the stock after the jointer has established a flat surface for the rip fence. This will roughly surface the second side parallel to the first one. The saw marks can then be removed with a light surfacing cut.

Figure 6-16. This type of distortion, called "wind," is indicated by a twist in the length of the stock.

Boards with wind (Figure 6-16) have a twist in the length of the stock. The best way to level such a board is to mark the high spots and remove them in the first pass, creating flat spots on which the board can rest. Warning: Don't waste time on badly distorted material. It can be dangerous and you may not have much material left after the distorted areas are removed. It's a good rule to joint only good wood.

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