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Thread: Wobble washers

  1. 6th March 2008, 12:45 PM #1
    orraloon's Avatar
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    Default Wobble washers

    Hi,
    I have a book by Robert Wearing "Making Woodwork Aids & Devices". All sorts of jigs and how to make them. In his section on finger joints on a table saw he fits wobble washers to offset the blade and make a wide cut. They are tapered washers and can be either metal or wood if you can not machine metal ones. My question is how safe is this and is it still current practice. My saw will not take dado blades so I would be interested if anyone has any experience with this method.

    Regards
    John
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  3. 6th March 2008, 08:02 PM #2
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    Default Wobble Washers

    Hi,

    I have a set of cast aluminium wobble washers I bought about 40 years ago to fit my hand held power saw. I can't believe they were allowed to sell them for that use. They have a series of numbers around the outside, and every increase in number increases the angle and wobble, so the cut gets wider. To see a hand held saw running with a wildly wobbling blade is enough to make your fingers drop off in fright. This is a very agricultural solution to making plough cuts. If your saw can't accept dado blades do the sensible thing and use your router table to trench cut panels.

    cheers

    Kevin
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  4. 7th March 2008, 12:10 AM #3
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    Wobble washers and similar devices produce a slightly curved bottom to the cut. Unless the mating piece is curved to match, the glue joint will be very apparent. If the saw arbor can accept extra washers, it should also accept one or two stacked blades. If not, or not wide enough, adjust the fence in increments slightly less than your blade kerf, and take several cuts. Depending upon the width of your dado, fence adjustments and several cuts may also be needed for the router table.

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  5. 8th March 2008, 11:55 PM #4
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    Thanks for the replies. It has comfirmed my doubts on the method.

    Regards
    John
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