T
thenextbigthing
Member
How do you know if your guitar has jumbo frets? What are jumbo frets? Whats the different between them and regualar frets. I see advertisments with guitar and some say they have jumbo frets.
EveningSky said:I also like Jumbo frets.
I have long wondered about the advantages versus disadvantages of different fret sizes???
Thank you,
ES
EveningSky said:I also like Jumbo frets.
I have long wondered about the advantages versus disadvantages of different fret sizes???
Thank you,
ES
How does that work then?? Sustain has nothing to do with what fret wire you use. Sustain is a result of the amount of energy in the string and the rate at which it dissapated via the bridge and to a much lesser extent via the nut or fret. A certain amount of energy is also lost via internal friction or damping in the string. In scientific terms it is considered as Impedence and often described as Q. You also lose a bit of energy as a result of the action of the pickup magnets. In basic terms the energy in the string is lost to two main components volume or amplitude and sustain. Increase one and you decrease the other. If you manage to increase sustain without changing the volume or amplitude of the resulting vibration you have created energy. A neat trick and I'm sure you would be in demand at many scientific institions re-writing the laws of physics. The material and mass of the fret has been proven to have a neglible influence on either the amplitude or sustain or for that matter tonal qualities of fretted instrument.One thing is more sustain because you are pushing a thin wire against a larger mass
muttley600 said:You also lose a bit of energy as a result of the action of the pickup magnets.
I'm not sure that current research or physics in general would support this. The amoumt of energy lost at the fret is reconed to be less than 1 or 2%. I can't remember the exact figure off the top of my head. When I did some research on this some years ago it certainly appeared to be the case. The difference between fretwire bone and brass was also minute. The difference in sound they appear to impart is it would seem more down to the nature of the harmonic waves setup in sympathy as the wave travels back and forth down the string.Jumbo frets do not, in and of themselves, increase sustain, but their height can keep the string from touching the fingerboard under your finger. Less energy gets transfered to the neck, where it is likely to get soaked up in a joint of some sort.
muttley600 said:These things are incredibly hard to be conclusive about however so I would qualify all this by saying as I understand it!! The physics however is pretty well accepted for a vibrating string. For energy in the string you have the amplitude and time of decay or "volume" and "sustain" they are linked and no amount of changing frets is going to change it so as you would notice the difference. What we do as instrument makers is to try and maximise the amount of air that that string can move over a given period of time and at a given amplitude.
Not entirely correct. The property of a material that is important here is Youngs Modulus which is a measurement of a matrials elasticity or the ability of a material to be deflected and return to its original position. This is crucial to the understanding of how musical instruments work and is fundemental material property. The material that a fret is made of has VERY little influence on the resulting rate of transfer of energy. A fret has to have enough stiffness and the ability to resit defromation and bone, fretwire, brass among others demonstrate are suitable for the purpose. Yes a softer material will decrease sustain because it will damp the vibrating string. We were not originally talking about changing material so this is not the claim that was made. The claim made was that a larger fret of the same material will increase sustain. This is ENTIRELY false regardless that there is more of it. Its modulus of elasticity remains the same as it is a material property.Volume and sustain are linked, yes, and are components of the energy in a vibrating string, but the point is that the material found at the points between which the string is strung (i.e, the bridge and the nut, or the bridge and a fret when the guitar is played) do have an effect upon how much or how little of that energy is transferred to a guitar body. Thus, bone is a better material for a nut than, say, pine, which will absorb vibration and decrease sustain. Similarly, density in fret material is important. Once again, plastic would be of little use because it will rob a string of kinetic energy.
muttley600 said:Not entirely correct. The property of a material that is important here is Youngs Modulus which is a measurement of a matrials elasticity or the ability of a material to be deflected and return to its original position. This is crucial to the understanding of how musical instruments work and is fundemental material property. The material that a fret is made of has VERY little influence on the resulting rate of transfer of energy. .
Young's Modulus refers to the elasticity of a material that is subject to forces of compression or tension, neither of which act upon a fret.
Wrong on both counts. Youngs Modulus is a measure of elasticity. It is used in tensile tests on material and also on compression tests to create stress strain graphs and indicate where a materials point of maximum deformation or "failure" would normally occur. I'll try to explain..Finally, I do not accept your point regarding the relationship between mass and stiffness. Mass is inextricably related to density, given that density is mass divided by volume. In fact, as a purely isolated term, mass is relatively useless. What, actually, does it refer to??? Not weight, which is the influence of gravity on a body. Not size, which is measured by physical dimensions. No, the definition most readily accepted is that mass refers to the amount of matter in a body. Which is a fairly useless statement when you think about it. The alternative: 'Mass is something with inertia' is even less helpful. Thus, the amount of mass within a space - i.e, density, - is useful for a luthier. And, if you will permit me one generalisation, density and rigidity, or 'stiffness', generally go hand in hand as far as timber is concerned.
muttley600 said:It is used in tensile tests .


I would imagine so. Anyone fancy a beer nowTensile...perhaps from the word tension?

muttley600 said:I would imagine so. Anyone fancy a beer now![]()

Ahh good ole specific gravity. I find I need a few pints to find a specific gravity that works for me... My wife used to call me ABV after a few nights out with the boys in the band. Not gigging of course!!!I'll bring my hygrometer and we can check relative levels of alcohol density

muttley600 said:Ahh good ole specific gravity. I find I need a few pints to find a specific gravity that works for me... My wife used to call me ABV after a few nights out with the boys in the band. Not gigging of course!!!![]()
