Essentials of woodworking

by Ira Samuel Griffith

Fig. 133.

Fig. 134.

72. Fastening with Screws.

—Where two pieces of hard wood are to be fastened with screws, a hole just large enough to take in the shank of the screw must be bored in the upper part. In the lower part, a hole should be bored just large enough to take in the core of the screw snugly. [Fig. 134]. For flathead screws, the hole should be countersunk so that the head may be flush or sunk slightly below the surface of the wood. In soft woods, the boring of a hole in the lower piece may be omitted.

Fig. 135.

73. Glue.

—Nails are but seldom used in cabinet work to fasten parts together; glue being used instead. Glue is manufactured from the refuse parts of animals. Strippings of hide, bone, horn, hoofs, etc., are boiled to a jelly; chemicals are added to give it the light color. It is usually placed on the market in the form of dry chips.

Glue pots are made double, the glue being placed in one part and this placed in a larger one which contains water.