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  1. #1
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    Default Rip a cupped board...best/safest way?

    Hi All,

    I recently resawed some rosewood from a large 250x50 piece. I have got 3 boards 15mm thick x 170 wide that will eventually be 12mm thick. Not surprisingly they all cupped a bit but one has cupped about 3mm across the face of the 170 width. This is too much to re joint/thickness as it will end up too thin. This piece was always going to be ripped to 50mm wide pieces but I had planned to thickness it first. Now I want to rip it then thickness the narrower widths down to 12mm. My understanding is that this is an acceptable method as the cupping across the narrower widths will be less.

    So my question...what is the best and/or safest method of doing this.

    Tablesaw with hold down, blade guard installed etc....Concave side up or down?

    Or Bandsaw....same question...Concave side up or down?

    Any other method? Ryoba saw maybe?

    Thanks in advance

    Redgy

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  3. #2
    Join Date
    Mar 2006
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    Default

    A handy trick is glue blocks. Get some pine blocks say (25 mm x 25 mm x by what ever the cup depth) then PVA glue them to the underside of the cupped board.

    Let the glue cure for the full 24 hours.

    Then place the cupped board on any large flat surface to see were its rocking, use a block plane or some sand paper to reduce the pine blocks down until the board rests flat without wobble and that it is stable.

    The more blocks the better.

    You should then be able to run the board through the tablesaw with it supported on the pine blocks. This should prevent the board from collapsing into the cup when you resaw the board.

  4. #3
    Join Date
    May 2005
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    Morphett Vale, SA
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    Default

    Thanks thumbsucker

    I looked at doing that and a few other ways. In the end I decided I just wasn't happy with using the TS at all and even the bandsaw was a bit iffy. I looked at a few hold downs for the bs and all this wasted about an hour. Then I spent the next 20 minutes doing it with a ryoba saw....and have now moved on

    Cheers
    Redgy

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