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Thread: How to make a Radius Dish

  1. #51
    Join Date
    Apr 2012

  2. #52


    This thread got picked up on another woodworking forum, and I glanced through it.

    The single curvature mold is probably better than the conical one, there really isn't any reason to build a conical arch into the soundboard, because the wood is already stiff in that direction, and therefore deforming it, is making a lot of weird things happen. You are building a pre-stressed structure in the direction of the stings, and then throwing an s curve into it such that the deformation in the direction of the soundhole (what we seek to avoid), is actually releasing the pre-stress.

    (Pre-stress is above my pay grade, but it is the weird world where bicycle wheels support their weight on columns of the spokes between the ground and the axle, contrary to the perception that they hang from the spokes.)

    The transverse curve is traditional and does not do bad things to the wood given that it flexes easily in that direction, and it stiffens the board in the same direction as string pull. Some nylon string guitar theory is based on the idea that a relaxed soundboard is a good soundboard.

    Uber jig master, and teacher to the many, Charles Fox, has recommended this style, or uses it.

    The only downside is that it makes the guitar look a little funny; you can see the curve a little since the fact it runs transverse only, leaves the rim of the guitar at different heights. It is subtle but if it isn't something folks are clamouring for, so it isn't going to help sales.

    There are a variety of reasons why spherical molds are used:

    1) Once you tool up it is actually easier to build this way, and everyone seems to be tooling up;

    2) It has a strong chance, as also with the OP/Fox method of reducing board splitting due to misuse, or too much travel.

    3) The bridge dive thing; one way of addressing that.

    4) I has virtually become mandatory in custom type instrument builds.

    Someone mentioned it is traditional which it is not, depending on your time horizon.

    Ukes on the other hand:

    1) Use some tough woods that are heavier and thicker than guitar woods

    2) Light string tension

    3) Hawaii doesn't seem to be splitting, how is it working out in world trade?

    4) Top are tiny, which also reduces splitting.

    I turn my workboards on a lathe, which takes a pretty big lathe for a guitar, but for a uke, not really. I use spherical boards, because everyone else does, though I use as little as possible.

  3. #53
    Join Date
    Apr 2011
    Fair Oaks, Ca


    Good day, all. I'm planning to build a 'no router' dish, but am trying to understand comments about arching the soundboard below the sound hole but keeping the top flat above the sound hole under the fretboard. How is that done?

    I'm thinking that you use a dish, and you keep the lower bout centered where the curve is as designed (i.e. 22' radius), but the upper bout will see the design radius longitudinally, but will see a flatter radius laterally. Or am I just over thinking this? Grin.

    Thanks for any insight.

  4. #54
    Join Date
    Nov 2015
    Pleasant View, Utah


    So I can't view the pictures that are posted all it says is to enable 3rd party hosting - do I need to do that or does the OP? (Dave) or are they hosted somewhere else?

  5. #55
    Join Date
    Dec 2008
    Stockholm, Sweden


    It's Photobucket's fault. It was a free service for many years but recently they started charging for hosting photos. So old links won't work.
    Building blog -
    Music and atrocities -

  6. #56
    Join Date
    Oct 2012
    Canberra, Australia


    See this thread;
    The Firefox fix works for Android devices. I devices still unknown.

    Direct link
    Last edited by Titchtheclown; 01-17-2018 at 07:34 AM. Reason: Followed up info
    My friends call me Titch. I have been known to clown.
    Ian Titulaer is my normie name.

  7. #57
    Join Date
    Dec 2011
    Grand Junction, Colorado


    I have a great way to make a radius dish- i order one

  8. #58
    Join Date
    Jul 2011
    central CA


    Copy that Beau
    My Real name is Terry Harris

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