How to Build a Drill Jig

Use a table saw to cut a piece of ¾-inch plywood large enough to fit on the nearest corner of the item to be drilled, while still covering the drilling location. For example, a cabinet drawer or door would require a piece a little smaller than the door or drawer face.

Cut two pieces of 1-by-4 lumber to fit two of the edges of your plywood. Cut them long enough to overlap at the corner for a stronger joint.

Glue and nail the two 1-by-4 pieces together to form an L, with the lumber standing on edge and one piece overlapping the other by 3/4 inch (the thickness of the 1-by-4). Nail through the overlapped piece into the end of the other piece. Use a pin nailer and at least three 1 1/4-inch nails.

Fit the lumber L you created to the corner of the plywood so that the plywood is centered in the height of the 1-by-4s, or 1 3/8 from each edge. This will allow your jig to be used on either face for items that come in mirrored pairs, such as cabinet doors. Glue and nail the lumber to the plywood, nailing through the 1-by-4 into the plywood edge, one nail every 6 inches.

Measure from the corner of the jig to the point you need to drill. If more than one hole is needed, label each location to avoid confusion. Use a bit the size of the hole you need to drill, and drill a hole centered directly on the mark. Keep the drill level and do not force it through the back side to prevent splintering.

Fit the jig onto the item to be drilled, pushing it up until it rests squarely against the corner of the item. Use a C clamp or quick clamp to hold the jig in place. Drill through the hole in the jig into your item. Apply steady pressure and do not force the drill. Drill all the way through, or wrap a piece of tape around your bit to mark it if you need to stop at a certain depth.