|Project by Bricofleur||posted 03-11-2012 02:01 PM||8905 views||23 times favorited||20 comments|
To evenly space pin holes when I build bookcases featuring adjustable shelves, here is this jig I use with my plunge router made out of 1/2’’ plywood, inspired by the one made by Norm Abram in The New Yankee Workshop TV show. Using a 5/8’’ Forstner bit, holes have been bored at 1’’ center at the drill press and a 1/4’’ hole have been drilled at each end. Those 1/4’’ holes will help relocate the jig using a 1/4’’ dowel (or a pin) to drill more holes.
Under the jig, a sliding fence sets the distance from the holes and the edges of the uprights. Wing nuts and fender washers lock it down. Each end can be precisely adjusted, thanks to the carriage bolts that slide in the slots.
After aligning the center lines of the jig and the upright and after setting the fence from under according to the required distance of the holes from the edge, they are both secured to the workbench with clamps.
It works with a 5/8’’ colar (or guide bushing) mounted on the router as well as a plunging 1/4’’ spiral bit.
To make a set of holes, I drop the collar of the router in each 5/8’’ hole and I make the plunges.
Thanks for looking.
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