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Thread: Riving knife

  1. #1
    Join Date
    Jun 2008
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    Too far from the shed, WA
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    6

    Default Riving knife

    Hi All

    I have an old Durden combinatin machine and was contemplating a few minor home upgrades. One question is how thick should the riving knife be - should it match the blade thickness or be thinner?

    Thanks
    Matt
    Eaton, WA


    Give me a shed full of tools and I will make less than someone with talent and a pocketknife.

  2. #2
    Join Date
    Feb 2004
    Location
    kuranda north qld
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    0

    Smile

    on my taiwanese table saw its slightly thinner than the blade? is this right? cheers bob

  3. #3
    Join Date
    Feb 2007
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    Macedon Ranges
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    Default

    Hi Matt

    The riving knife should be wider than the blade body and narrower than the kerf.

    If it's wider than the kerf, the stock will clearly jam on the knife.

    If it's thinner than the blade body, it defeats the purpose of the knife. The stock can still bind on the blade and give you a kiss.

    Hope that helps.

    Ravi

  4. #4
    Join Date
    Jun 2008
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    Too far from the shed, WA
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    Default

    Thanks Ravi, exactly the type of info I needed. Worked out that wider than the kerf would be bad but wasn't suer whether it needed to be balde kerf or body thickness.

    Matt

  5. #5
    Join Date
    Jan 2006
    Location
    poland
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    79
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    Default

    Hi Matt

    Exactly what Ravi said but in an official drawing of HSE...

    Regards
    niki

    Attachment 112343Attachment 112344

  6. #6
    Join Date
    Apr 2002
    Location
    Brisbane
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    Default

    2.5 mm for a blade with 3mm carbides would be reasonable and from convienient stock.....unless the blade had a heavy body plate.
    Thats about what is on may machine.

    cheers
    Any thing with sharp teeth eats meat.
    Most powertools have sharp teeth.
    People are made of meat.
    Abrasives can be just as dangerous as a blade.....and 10 times more painfull.

  7. #7
    Join Date
    Aug 2005
    Location
    Queensland
    Posts
    613

    Default

    Agree with the above.

    Trying to be on the lookout for a potential problem, the only thing to be aware of is if you have the standard 3mm kerf blade some of these newer thin kerf blades could be a problem - I have not had any experience of them only seen them in the magazines but I believe that they are becoming more popular.

    Regards,
    Bob

  8. #8
    Join Date
    Nov 2005
    Location
    Darkest NSW
    Posts
    93

    Default

    According to all the books I have, the riving knife/splitter is supposed to be halfway between the body thickness of the blade and the thickness measured at the teeth, i.e. the average of the two measurements.

    I make my own splitters to go with my replacement zero clearance inserts, and have two standard thicknesses of splitter to suit my Infinity combo blade and a thin kerf Freud. Getting the splitter aligned spot on is just as important as getting the thickness correct !

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