Tapered Scarfed Joint. Fig. 113.

Material: 2 pieces, 6" X 1 1/2" X 7/8".

Fig. 113. - Tapered Scarfed Joint.

This form of scarfed joint is used for the same purpose as that described in Topic 59, but it has a greater shearing resistance, or a greater resistance to pressure from above. It is obvious that the pieces must be securely bolted, keyed, or strapped, unless the ends are secured so that there cannot possibly be any slipping endways.

Fitting the joint: In laying out this joint, use a knife and try-square ; the distance from the face edge at a should be 3/16", and that at the other end of the cut should be 1 5/16". This latter mark should be made only from 1 5/16" from the face corner, indicated by c, to the lower edge of each piece, since, if a knife mark were made across the side, it would remain a blemish upon the finished model,. as it is difficult to smooth out a knife mark. These marks, which indicate the lines a a, should be made upon both sides of each piece. With a gauge, working from the face edge, which is marked with the face marks, c, lay off the distances 3/16 and 1 5/16 by points, not by scratches, as the latter might make a blemish. Join these points with a knife mark; cut and fit as in Topic 59. Fasten together and finish, as in the preceding exercise.