The present invention provides a centering guide jig for a drill work, comprising: a base member; a plurality of adapters; a plurality of rotary guides; and alignment guide parts. The base member is positioned on a target processed object with a predetermined width in the longitudinal direction of the target processed object and has a plurality of guide holes arranged thereon in a line, the guide holes vertically passing through the base member to guide a drilling position. The adapters are coupled to some of the guide holes or all guide holes through screws and each have a drilling hole formed on the center part to allow a drill bit to pass through. Each rotary guide is rotationally installed to access the base member by allowing a corresponding adapter to pass through the guide holes to be coupled through screws and has coupling holes formed on both sides thereof, respectively, at equal intervals based on the corresponding adapter. The alignment guide parts are positioned on the lower parts of both sides of each rotary guide, are installed to be rotated with respect to a rotary guide by a fixing bolt coupled to the coupling holes through a screw to connect the rotary guides and locate the base member to allow each guide hole to be aligned on the center in the widthwise direction of the target processed object in such a manner that the rotary guides are rotated to be in close contact with both side parts of the target processed object. According to the present invention, convenience in assembling and installation can be provided, and reliability in centering can be increased. Furthermore, drilling of an eccentric position with respect to the center can be guided, and drilling to form a hole with a different diameter can be guided. Moreover, a secondary drilling to form a hole between holes formed by a primary drilling can be guided, and the diameter of the blade shoulder can be easily measured.;COPYRIGHT KIPO 2016
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