Читать книгу Practical Weekend Projects for Woodworkers - Phillip Gardner - Страница 16

A power drill is a necessity; virtually every carpenter owns at least one. These can be either powered straight from the outlet or by battery. The latter is more expensive but much easier to use since you are not restricted to trailing lengths of cable. The minimum power required is 12 volts with a quick (one-hour) charge.

For each job, you will need a selection of drill bits. These are designed for masonry, metal, or wood and graduate in ¹/₃₂ in. (1 mm) increments. High-speed-steel bits, normally called HSS bits, are general-purpose bits, used for both wood and metal. “Spur” or wood bits have a flatter cutting profile with a small point or spur in the center. This locates the center of the drill and stops the bit from “wandering.”

Flat bits offer a crude but effective method for the drilling of larger-diameter holes when accuracy is not imperative.

Drill bits: the red case holds HSS twist drill bits, the gray case contains “spur” or wood bits. The remaining pieces include 1 multispeed bit, 2 hole cutter, 3 flat bits, 4 countersink bit, 5 masonry drill bit, 6 plug cutters.

A hole cutter is pricey, but accurate and longlasting; it will cut both wood and metal.

The multispeed bit is also quite expensive and is only really necessary if you envisage doing a lot of work with the same size drill, such as fitting cylinder locks.

Also of use are plug cutters, employed in the making of the Adirondack Chair here and the Duckboard here. A slightly better type with four cutters is also available, with the advantage of being self-centering.