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Message started by mtracz on May 6th, 2008 at 11:57am

Title: Soundboard Thickness for European Spruce?
Post by mtracz on May 6th, 2008 at 11:57am
All,

I am starting a couple tenor ukes with guidence from your book and plans.  How thick should a European spruce top be?  I know final thickness "depends", just looking for ballpark figure.

Also how thick should the spruce bridge patch be as I will be using a classical stye bridge rather than the steel string style with bead inside body?

Thanks in advance and I could post progress if anyone is interested...  

_Mike T.

Title: Re: Soundboard Thickness for European Spruce?
Post by Matt Blacka on May 6th, 2008 at 1:15pm
Hi Mike,

I've spent ages hunting through previous posts on this forum, extracting info on approximate soundboard thiscknesses people use. I think what I finally worked out was that for spruce, people use about 0.08" - 0.09" (2.0 mm - 2.3 mm). For hardwoods like koa or mahoganny more like 0.06" - 0.07" (1.6 mm - 1.8 mm)

For the bridge patch, I'm not so sure about what thickness to use with a tie-block classical style. Generally people go for something about 0.07" if using a spruce patch on a spruce soundboard, but this is with a bead-end string situation, where the strings go through the bridge/soundboard, and a bead holds them in place against the inside of the bridge patch. I would think you would have to be no thicker than this, and in fact could probably go a bit thinner, as you don't have the intense focussed point load of a bead pressing against the patch.

Hope this helps a little,

Matt

Title: Re: Soundboard Thickness for European Spruce?
Post by mtracz on May 7th, 2008 at 3:50am
Matt,

Thanks for your reply!

This helps a great deal.  Your info is what I used on my nylon parlor build and I just wanted to make sure it wasn't too stiff for a ukulele.

Another question...
If I'm building with Mahogany back and sides what do you recommend for their thickness?  I'm assuming in the .08" range.  

Again thanks for you help.  This is an amazing forum.

_Mt

Title: Re: Soundboard Thickness for European Spruce?
Post by unkabob on May 7th, 2008 at 7:05am
Mike:
My honduras mahogany top and sides (that I sanded yesterday) were Top and back - 0.085 minus and sides - 0.075 minus. My sander gives about three thou difference on various points of the piece.

There is a thread somwhere on this board.

Bob

Title: Re: Soundboard Thickness for European Spruce?
Post by mtracz on May 9th, 2008 at 5:54am
great

thanks!
If interested, I'll keep you posted on progress...

_Mike

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