This indexing mechanism can be incorporated into a variety of woodworking jigs for the table saw, drill press, overarm router, and other machines where accurately spaced cuts, dadoes or holes are required. The idea was originally given to me by Herman Kundera, a knowledgeable woodworker from San Bruno, Calif.

The mechanism consists of a spring catch mounted to the jig’s fixed or base side and stops of finishing-nail heads set in the sliding side of the jig. The locations of the catch and the nails can be reversed if it’s more convenient. For precise, accurate spacing, predrill holes for the finishing nails with a slightly undersized bit. Vary the nail spacing as required for the particular job at hand. Although I made my spring catch from a piece of hacksaw blade (anneal for bending and drilling, then reharden and temper), any thin piece of metal would make a serviceable catch. Fasten the catch to the jig with a roundhead screw.

In using the jig you will slide one part against the other. The spring will ride up and over the nail head and then click down. When you feel the spring click, move the jig back until the spring catch registers against the nail. Now you’re ready to proceed with cutting, drilling or whatever.

Donald M. Steinert, Grants Pass, Ore.

Fine Woodworking Magazine, December 1981 No. 31

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