Australian/New Zealand Luthiers Forum

Gorgeous guitar! The frequency spectrum looks good with a lot of peaks and the guitar came out very close to target before doing anything. How does it sound now? How is the intonation?

Stringing up the guitar drops the top resonance T(1,1)2 about 5 Hz and with coupling drops the air and back. Looking at your set of plots I noticed you made changes before stringing the guitar. You looked pretty close with your back low. I would not have made any changes until I had a plot with the ...

I often do a CA pore fill on ukuleles and head stocks veneers. Guitars are too unpleasant to do because of the fumes. I use Gluboost fill and finish, both the regular and the thin. It has a long open time. I use a paper towel (not a cotton rag*) to polish the CA into the pores. I get a very nice res...

Nicely done. good looking guitar. I love small guitars.

I mostly use epoxy, as the clear pulls out the grain of the wood. I personally find the sawdust shellac and pumice method hides the pores as it fills them pores with sort of the average color of the wood. Black or dark fill and clear tends to emphasize them (my personal preference). I have found Aqu...

It is fun to see the progress of your guitar. I am interested in the neck joint. I use Belleville washers to help keep the bolts tight. I like them more than a combination of a flat washer and a lock washer. A Belleville washer can stay tight through an expansion-contraction cycle. Other washers can...

I have no idea, but I have thought about it when intonating classical guitars. I am not sure of your bench setup but depending how the guitar is supported on the bench the neck can be pulling forward slightly as well. I always do my intonation checks in playing position. Even still I am never sure h...

My thought is to collect a lot of samples and then pull out the peaks that show up a lot more than others. There should be resonant peaks off of every impulse. I was watching a spectrum graph in real time as I played. I knew what the tap spectrum looked like and I could see it. I just thought the mi...

I never determined the resonances from a recording, but knowing the resonances I was able to see them in a plot while playing.

your fdiag is way too high. It is a hard one to get as it will be 30 or 40 Hz. So I just set that part of the equation to a nominal value of 1 and I get around 3.1 mm. Your other frequencies are close to what I would have expected. This looks like a reasonable thickness to me as it is a big guitar. ...

I think the back shows as a monopole. I think when the top was stiff the back and the top were on top of each other. I have no idea why you do not see a pattern at 205, when you see a resonant peak there.

Sounding good is somewhat subjective. What do you like with the Martin that is missing in your guitar? It would be interesting to do a bit testing on the Martin, both spectrum and specific mobility to see if you can associate any difference to what you are hearing.

No excel only a calculator

1kg = 9.81 N

I made a mistake the following is the correct calculation.
So in a calculator .. 9.81 / .16 = 81.75 X 1000 = K= 81750

mass = 81750 / (2 * 3.141 * 170)^2 = 0.07167 m(kg)

1 / square root (81750 * 0.07167) * 1000 = 13.064 In the range for a SS.

Not from only those 2 measurements. You would also need the weight of the load used for the deflection. Do three calculations even with a calculator. K is the stiffness K is N/M so get your load into Newtons then divide that by your deflection times 100000 (turning your deflection into meters) get m...

Thanks Trevor, I was overthinking it and missed the obvious. A simpler example for your point than either the capo or bar chord is fretting a string in two positions which is also normal. If I am fretting with my ring finger and place my index finger on the same string a couple of steps down the nec...

I am no expert in compensation, but someone (don't remember who) mentioned something which I am still digesting. If you compensate the nut and you put a capo on a fret, the total length of the string is still shorter compared to a non compensated. So the nut compensation will make a difference with...

or Intonation and capos A flamenco player gave me a 650 scale Flamenco guitar that has really good flamenco tone, but with intonation problems. He had a luthier friend who worked on it and made it somewhat better, using the limited amount of saddle intonation available and removing some to all of th...

I have done it both ways. If wide enough I generally do not add the ears. I do not mind showing the scarf on the sides. I did have one instrument where I added ears and I also managed to carefully place the back end of the scarf right under the volute. The headstock transition had a very clean look

Thanks Trevor, That makes the cross grain a lot easier with odd shaped plates.

I did do the cross grain at exactly 5 cm but I picked 5 cm because I had that much. I was not following any guidance. We rely on the stiffness of wood at 6 mm wide when we use it for braces, so it seems like 30 mm or so should be OK.

I would square up the upper bout and do a deflection test on the squared portion for the long grain. It seems like a deflection tests on a rectangular 3 cm strip should work. Use less mass for the deflection test. Or if you have sides from the same wood take a strip off one end of the sides. nonrec ...

Hi, and happy new year! I have 2 questions 1. Has anybody tried Richlite for a bridge material ? Felt very light and should be strong enough, i guess. 2. Before i rabbet the part of the primary braces that goes over the bridgeplate, is there suppose to be space between the underside of the primary ...

The bracing looks fine to me. Under tension the neck is going to pull forward a bit. I even allow a millimeter at the saddle when I do calculation for string height from the top at the saddle when setting the neck angle. That normal movement under tension will reflect itself in the top as the neck b...

A great video I enjoyed watching and a fine looking guitar.

Yes, get some oversized pins.