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Thread: Top Radius?

  1. #1
    Join Date
    Dec 2019
    Posts
    23

    Default Top Radius?

    Do you put a raduis on your tops? If so, how much?
    I know that most builds have flat tops..

  2. #2
    Join Date
    May 2011
    Location
    So. Oregon
    Posts
    1,757

  3. #3
    Join Date
    Nov 2013
    Location
    Trois-rivieres,Quebec
    Posts
    37

    Default

    30 for me. Because this is what I put on guitars and I had the radius dish.

  4. #4
    Join Date
    Oct 2014
    Location
    Little River, California
    Posts
    2,486

    Default

    I make flat tops (radius 0.0). Good enough for a guitar I figure it's good enough for an ukulele plus I detect no change in the sound. In my mind what a radiused top gives is added strength against the dreaded bridge rotation and possible bellying. A radiused top is just plain stronger. It's physics. You know, the triangle and all that...

  5. #5
    Join Date
    May 2018
    Location
    Kekaha, Kauai
    Posts
    251

    Default

    In Cannon Beach, I use a 25’ radius for the top and 15’ for the back. In humid Kauai, I use a 15’ radius for both, primarily for added protection against humidity changes.

    Brad
    Bradford Donaldson
    Kekaha, HI and Cannon Beach OR
    bradfordj48@outlook.com

  6. #6
    Join Date
    Oct 2009
    Location
    Skykomish Valley, Washington USA
    Posts
    161

    Default

    I have been using a 15 foot radius dish from StewMac for four ukes now, top and bottom. On the first one I ended up with a reduced bridge height to compensate for the rise of the "dome" that it sits on, so now I've adjusted the neck angle slightly to make up for that.
    This places the saddle at a slight backwards angle. So far they sound fine to my ears but should I compensate for that and cut the slot with a little forward lean to it?

    Also, my favorite uke, a 2007 Kamaka baritone, has a very rounded back - seems to me about 6 foot radius. I'm not finding a dish for that for sale - does anyone know where to buy, or should I make one? (thanks to the archive here)
    -Vinnie

  7. #7
    Join Date
    Jul 2012
    Location
    Mangawhai NZ
    Posts
    471

    Default

    This places the saddle at a slight backwards angle
    Alhambra guitars are steel string guitars made in Spain. Wonderful guitars. One of their design features is a saddle that is angled slightly backwards to compensate for the forward pull of the strings.
    (I know that ukes are not guitars but) I tried the idea on a couple of baritones and am pleased with the results.
    Miguel

  8. #8
    Join Date
    May 2011
    Location
    Greenville, VA.
    Posts
    831

    Default

    Quote Originally Posted by mvinsel View Post
    I have been using a 15 foot radius dish from StewMac for four ukes now, top and bottom. On the first one I ended up with a reduced bridge height to compensate for the rise of the "dome" that it sits on, so now I've adjusted the neck angle slightly to make up for that.
    This places the saddle at a slight backwards angle. So far they sound fine to my ears but should I compensate for that and cut the slot with a little forward lean to it?

    Also, my favorite uke, a 2007 Kamaka baritone, has a very rounded back - seems to me about 6 foot radius. I'm not finding a dish for that for sale - does anyone know where to buy, or should I make one? (thanks to the archive here)
    -Vinnie
    I use a 15' dish to brace uke tops but press them flat on the sides.
    I made a 9' radius dish, and also a 3' cylindrical form for mandolins. They are fun to make. No idea where to buy them.

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