We’ve seen “incremental positioners” for your router table from Incra (and others). They essentially let you clamp down your workpiece and move it very precisely to make repeating cuts, such as those used to make wooden hinges. What we haven’t seen before is an easy way to drill our the hinge centers perfectly straight; Angling off even a little makes the hinges wobbly.
Now it appears that Inca also offers a drill guide designed for just that purpose. They call it the “HingeCrafter.”
It’s a little billet metal jig that clamps in your shop vise then utilizes a small screw clamp — inserted though any of the many holes in the jig for that purpose — to hold your hinge in place. Your hinge locks into a cylindrical jig which then guides your bit right down the center.
The HingeCrafter includes four cylindrical jigs in different sizes: 3/8″, 1/2″, 5/8″, and 3/4″. Street pricing starts around $70. (Of course, you’ll likely need a positioner to route out the hinges to get to this point. Incra’s goes for around $350. You can find it on the same site listed below, or try a Google search for other brands.)