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zero clearance insert start/finish blade

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  • #16
    Re: zero clearance insert start/finish blade

    I have used MDF ZCI's for years on several different saws, and never put a finish on any of them. They have always held up very well. As to making the kerf the full height of the blade, this can help if you are doing a quick or non repetative dado cut. You just line up your pencil/scribe line with the side of the kerf and you're good to go.

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    • #17
      Re: zero clearance insert start/finish blade

      Originally posted by hewood View Post
      Most 10" saws don't drop a 10" blade low enough to start the kerf, so you typically need to use a 7" or 8" blade to start, but once you've cleared enough kerf depth to accommodate a 10" blade, use the blade that'll be in the saw so you get your "zero clearance"....hopefully it's a real nice blade!
      Another way to do this is by routing a narrow groove deep enough to clear your 10" blade in the bottom of the ZCI along the blade position. Usually a 1/4" deep is enough clearance. Then you can mount your ZCI using the correct blade and just run it up through to make the kerf slot.

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      • #18
        Re: zero clearance insert start/finish blade

        Originally posted by 3rdtime View Post
        Another way to do this is by routing a narrow groove deep enough to clear your 10" blade in the bottom of the ZCI along the blade position. Usually a 1/4" deep is enough clearance. Then you can mount your ZCI using the correct blade and just run it up through to make the kerf slot.
        Yep; I actually make my ZCI's out of two pieces of 1/4" hardboard. The lower half has the rear locking tab in it, and a hole around where the blade will raise. When glued to the top half, I've got a perfectly sized locking tab, and a 1/4" recess for a 10" blade... works pretty well (I do generally have to sand down the bottom half by tiny amount (maybe 1/16th..?) to ensure it's perfectly flush, but otherwise it's a perfect fit.

        --Jeff

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