In understanding how to make guitars and guitar-type instruments, you only need to grasp a few basic facts. Looking at things simply in the beginning, how to make a guitar can all be logically understood by dissecting the instrument into three major parts; there is the body, which can be hollow, or solid in the case of an electric guitar; you will find the neck, which both holds the strings taught along with provides a place for fingers to press the strings against (at different places, effectively shortening the duration of the vibrations thereof, to varying degrees), for creating different notes; and then there are the strings themselves. Let us take a closer look at the first two... - Jadakiss Type Beat
Before we get into the math associated with fret placement, if you're looking to know how to make guitar necks such as those we see on guitars in instrument shops, particularly with those electric types who use steel strings, you may invariably need to route a channel (usually within the fret board, before attaching it) centrally along the length of it to get a truss rod to be kept in place. A truss rod can be used to correct any natural bowing which could occur in the wood with the neck, or which could also be due to the stresses of stretching steel strings on there, by adjusting the stress thereof.
Understanding how to make a guitar neck for acoustic types the ones using nylon and other material for strings, we discover that this may not be necessary. Developing a slight arc to the fret board across the cross section of the neck might or might not be desired, based upon the player's specific needs - with this aspect of how to make guitar necks, you'll find that these can be of different radii, like with the Gibson type guitar fret boards, which can be of a 12" radius arc.
Learning to make guitar fret placements across the length of the neck become known requires a wee bit of math - a little trick known as the "18 rule". The 18 rule can be a means of finding precisely best places to place each fret on the fret board, and is also a must-have bit of information, in the event you really want to know how to make a guitar. It goes similar to this; you measure the distance from the "effective length" of the string... this means, the part of the string that lies freely involving the "nut" at the head stock end with the neck (also called the "zero fret"), along with the "bridge" at the body end in the strings.
You then take this measurement and divide by 18 - or much more precisely, 17.8167942... consider the answer to that math problem, along with the precise distance in the nut to place the first fret. Now measure from that increased first fret placement along with the bridge, divide that by 17.8167942, then you have precisely best places to put the next fret, etc. The number 17.8167942 is pretty close to 18, thus the particular rule.
There are other factors to learn how to make guitar type instruments, but none of them that are quite as mathematically involved as finding fret placements a great deal. Now that you know the 18 rule, you have got the hardest mathematical part with you. So as you can see, figuring out how to make a guitar and putting one together don't have to be very difficult. The rest 's all a matter of how well you work with your hands and what tools you have at your disposal. With strings, fret wire, machine heads and wood clamps and the like, readily available and easily enough bought, it's all easy enough to put together when you know how. - Jadakiss Type Beat