Fig. 210.—Dowelling a Cabriole Leg.
The tools used in dowelling are: Brace, countersink, dowel-rounder, twist bit, try-square, marking-awl, and the usual bench tools. The first four are illustrated at [Figs. 194], [195, 196 and 197] respectively.
The method of working is: Plane up, mark out, bore holes, countersink, glue dowels and complete joints.
THE SCARF JOINT
The method known as "scarfing" is used for the joining of timber in the direction of its length, enabling the workman to produce a joint with a smooth or flush appearance on all its faces. One of the simplest forms of scarfed joint is known as the half lap, in which a portion is cut out at the end of each beam or joist, equal in depth to half the full depth of the beam, and of equal length to the required scarf.
The two pieces before they are placed together form a joint as shown at [Fig. 211], the projecting part (A) fitting into the recessed portion marked B and the two pieces being secured in their respective positions by screws.
[Fig. 212] shows a dovetailed scarf joint. This is a variation of [Fig. 211], the length of the dovetail lap being from 6 ins. to 8 ins. in length.
[Fig. 213] is an illustration of a joint designed to resist a cross strain. The face side is left flush, whilst the underside is assisted by an iron plate. The joint is secured with nuts, bolts, and washers. This type of joint is frequently used for joining purlins in roof work; the iron plate on the underside is in this case omitted.