Essentials of woodworking

by Ira Samuel Griffith

Fig. 78.

Fig. 79.

In boring hard wood or metal, make a “seat” for the point with an awl or, in metal with a center punch. Otherwise it is difficult to start the bit in the exact place.

The gimlet bit, [Fig. 78], is used mainly for boring holes for screws.

40. Countersink Bit.

—[Fig. 79] is an illustration of a rosehead countersink. This tool is used for enlarging screw holes made with the gimlet so that the heads of the screws may sink into the wood even with or below the surface.

41. The Screw-driver Bit.

—The screwdriver bit, [Fig. 80], is not a boring tool, but as it is used in connection with the brace it is inserted here. It will be found convenient where large screws are to be inserted. Where a large number of screws are to be inserted it will permit of very rapid work.