Australian/New Zealand Luthiers Forum

I went ahead and shaved (scalloped) the lower two back braces in the center. Watching the T(1,1)1 as I progressed. As you suggested, it required removing a lot of material (they were 20 mm height), before I saw some movement. Eventually, T(1,1)1 moved down to 101 Hz, half-way between G and G#. T(1,1...

Ok, and thanks for the comments. The build is complete. Numbers are with strings installed, and guitar stabilized for a week or so and played. No wolf tone at G# that I can hear. Moving T(1,1)1 would be for academic/learning purposes -- what happens if? With strings removed (pins and saddle in place...

I am doing final testing on an OM-style guitar. X-braced top, ladder braced back. Back braces are 10x20mm, trapezoidal. That is, non-live. I am seeing T(1,1)1 at 104 Hz, and T(1,1)2 at 190 Hz. No T(1,1)3 that I can see. I would like to move that 104 Hz away from G#. Sound hole diameter could be incr...

Thought I posted a similar recently, but trying again: I see variations on how face and finger braces, and the bridge plate, interface to the X-braces. Some builders prefer that there are no connections, with an intentional gap. Others want a connection. G&G recommends the latter, with the braces bu...

re: 6th string bearing surface. Something my novice brain did not consider

Thanks for your input and time.

Kevin

Thanks; Though I was not suggesting that the first string be centered, but that the range be centered. Using string compensations from Table 21-2, and a fixed nut compensation of 1.1 mm, the first string would be at 645.3 mm and sixth at 647.9 mm (measured from the nut) from the equation in Section ...

In both editions, the example calculation (section 20.3.2) for routing the steel string saddle slot gives a dimension from (compensated) nut to front edge of the saddle, but using the active string length values from table 21-2. These values are from contact point to contact point. This would seem t...

That makes a lot of sense.

I'll check inside and maybe do some tweaking on the X's around the bridge.

Thanks !!

Kevin

Thought I had posted this a few days ago, but trying again: The uncoupled top frequency is 153 Hz. With the deflection readings , mobility comes out to about 14.5e-3, which seems pretty good. But the bridge rotation is barely 1 degree (0.97). Makes me wonder about relationship between bridge rotatio...

Thanks to all.

Will do deflection test, and uncoupled taps

Kevin

Several years ago I built a dreadnought from public plans, using fairly good guitar wood, with build advice from Cumpiano's book. I was happy with build quality, but the sound was dead. Later I decided to start doing some more building, purchased Gore and Gilet's books, and did some measurements on ...