To make the Board a groove type “dovetail” is not difficult. Two cut with a hacksaw, one blow chisels and groove ready. When processing the same chipboard or plywood such technology is unacceptable because of the relative homogeneity of the material in two or even in three directions; the chisel will not help — sawn tongue not break away. Therefore, it is better to use a jigsaw with curved approximately at 45° the ends of the machine. Such a tool can be cut even by the pine, carried out along the boards, a jigsaw is not available.