Abstract: A coping jig for making cuts for forming an inside corner for trim boards, particularly baseboard moldings, includes a clamping plate having an integral backing plate along the length of one side and a generally central opening. Right and left workpiece toggle clamps are operably coupled to the underside of the clamping plate on both sides of the opening. A clamping block is secured to the upper side of the clamping plate on each side of the opening. A flat router stage with an opening therethrough is mounted on the clamping blocks with the opening generally between the blocks. A die clamp is operably coupled to each block for holding a selected pattern between each die clamp and the associated block.