Setting the Fenceīoth of the Infinity bits feature depth-limiting bearings, installed at the factory. The process described here takes a little longer the first time but allows repeating the setup later much faster.
While this works, the thickness of the tongue can vary substantially, which makes repeating the setup very difficult. Setting the fence flush with the bearings insures correct dimension of the tongue and groove. Note: A common method for setting up tongue and groove bits is to set the grooving bit close to center and then make two cuts, flipping the board over between them to actually center the groove. Hint: Marking the top face of all test pieces and making the cuts with that side up will make it easier to identify which way cutter height must be changed to effect a correction. If the instructions that came with your bit set differ, use those instructions. The basic design of the Infinity set is very similar to many other tongue and groove sets on the market and this setup procedure will work with most of them as well.
The bit set used for this article is the Infinity #61-502 Tongue and Groove Bit Set, with ½"-shank. All examples throughout this story use ¾"-thick wood. It is also the maximum useable thickness for most tongue and groove sets. For most home woodworkers, ¾"-thick wood is most common and works well with these cutters. While having all three features equal in thickness is ideal, that depends greatly on the thickness of the material. The primary concerns are the alignment of the joint itself, including the faces of the boards being joined and the final dimensions of the three primary features, the tongue and the shoulders above and below the groove. Setting up tongue and groove bit sets is easy, especially after going through the process a time or two. This setup procedure is simple and easily repeatable.
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