I didn’t trust hand drills to give me the perfectly perpendicular holes I need. Instead, I've drilled holes with my plunge router and the shop-made self-centering jig you see here.

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I recently needed to drill 34 "-diameter holes into the end grain of some 82"-long bed rails: too long for my drill press, too big for my doweling jig, and I didn't trust a hand drill to give me the perfectly perpendicular holes I needed. Instead, I drilled the holes with my plunge router and the shop-made self-centering jig you see here.

Start by making the jig from 14 " hardboard and two scrapwood fences spaced to match the thickness of the workpiece you want to drill. Install the jig in place of your router's factory-supplied subbase, with the bit centered between the two fences.

Now install a 34 " plunging straight bit (such as Woodline WL-1038, 12 " shank, 800-472-6950 or woodline.com), clamp the workpiece between the fences, and plunge slowly, withdrawing occasionally to clear chips.

With this jig, I've found I can plunge about 112 " deep with my existing bits. If I need to go deeper, this plunged hole provides an effective guide for a Forstner bit in my handheld drill.
—Andy Newhouse, Syracuse, N.Y.