Kerf Making Jig

Every once in a while I will have the need to make a dado for another piece of stock to fit into.  This usually requires a very tight fitting dado.  The method that I use to use involved trial and error on scrap wood until I obtained a good fit.  Well, I got sick of doing it this way.   So I thought of a quick jig that I could make that in principle works similar to the KerfMaker by BridgeCity Tools.  Instead of dialing the thickness of the stock into the jig, as in the KerfMaker mine uses the stock that goes into the dado directly during the cut.

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The width of the saw kerf is accounted for by using a screw or bolt.  The jig produces very tight fitting dados that can be dialed-in for fit by adjusting the screw in or out.  I think I will keep this jig handy near the table saw!

For a demonstration of how the jig is used, see the video.


5 Responses to “Kerf Making Jig”

  1. Steve Miller says:

    Brian — Next visit to North Carolina*, I will buy you that beer!

    *Family in Thomasville…

  2. Don Tai says:

    This is a very interesting jig, and much simpler than the other kerfmakers. I need a kerfmaker, and yours is simpler to make so I will try to build it. I wonder why you made the cutout. The video says this cutout marks the reference end. I don’t understand this, but I would like to. The screw accounts for the kerf of the blade. I don’t see the need for the cutout, so I must be missing something.

    Thanks, Don

    • Brian says:

      The cut out was made so that there is less surface area available for referencing off of your stock and has the potential to reduce error. It isn’t absolutely necessary.

  3. Don Tai says:

    I have tested your jig and it works exceedingly well. It is the most sophisticated stick of wood I have built! I used a piece of hardwood, sanded smooth and checked using vernier calipers for dimensions. My screw extends 2.61mm, giving me a press tight fit, exactly what I want. Thanks.

    How did you come up with this design? I was about to get out my router and do a more complex kerfmaker, which has 2 parts and slides, but your design works well and is much simpler.

    The only issue I have, which is also true for the more complex kerfmaker, is how to do the dado when the chosen wood is too long for the fence? I suppose I could make a pencil mark on top of the wood and use that as the end.

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