Fingerboard
The fingerboard is an important component of most stringed instruments. It is a thin, long strip of material, usually wood, that is laminated to the front of the neck of an instrument. The strings run over the fingerboard, between the nut and bridge. To play the instrument, a musician presses strings down to the fingerboard to change the vibrating length, changing the pitch. This is called stopping the strings. Depending on the instrument and the style of music, the musician may pluck, strum or bow one or more strings with the hand that is not fretting the notes. On some instruments, notes can be sounded by the fretting hand alone, such as with hammer ons, an electric guitar technique.
The word "fingerboard" in other languages sometimes occurs in musical directions. In particular, the direction sul tasto for bowed string instruments to play with the bow above the fingerboard. This reduces the prominence of upper harmonics, giving a more ethereal tone.
Frets
A fingerboard may be fretted, having raised strips of hard material perpendicular to the strings, which the player presses the strings against to stop the strings. On modern guitars, frets are typically made of metal. Frets let the player stop the string consistently in the same place, which enables the musician to play notes with the correct intonation. As well, frets do not dampen string vibrations as much as fingers alone on an unfretted fingerboard. Frets may be fixed, as on a guitar or mandolin, or movable, as on a lute. Fingerboards may also be unfretted, as they usually are on bowed instruments, where damping by the finger is of little consequence because of the sustained stimulation of the strings by the bow. Unfretted fingerboards allow a musician more control over subtle changes in pitch than fretted boards, but are generally considered harder to master. Fingerboards may also be, though uncommon, a hybrid of these two. Such a construction is seen on the sitar, where arched frets attach at the edges of a smooth fingerboard; unfrettable strings run inside the frets, while frettable ones run outside. The fret arches are sufficiently high that the exterior strings can be fretted without making the finger making contact with the interior strings, and Frets may be marked by inlays to make navigating the fingerboard easier.On six-string guitars and bass guitars, markers are typically single smallish dots on the fingerboard and on its side that indicate the 3rd, 5th, 7th and 9th frets—and the octaves of those positions higher up the neck. A double dot or some other variation marks the 12th fret and 24th frets. Variations on the standard dot shape can make a guitar more distinctive. Position markers are sometimes made luminescent to make them more visible on stage. Position markers are also sometimes repeated on the edge of the fingerboard for easy viewing.
Over time, strings wear frets down, which can cause buzzing and deaden the sound. Fixing this occasionally requires replacing the frets—but more often they just need "dressing". In fret dressing, a luthier levels and polishes the frets, and crowns the ends and edges. Stainless steel guitar frets may never need dressing, because of the density of the material. Not having frets carefully and properly aligned with the fingerboard can cause severe intonation issues and constant detuning. The ultimate way of determining the source of a buzz and detuning problem is to measure the levelness of the frets. A straightedge positioned on the neck in the "lie" of one of the strings should show nearly level frets.
Materials
On bowed string instruments,, the fingerboard is usually made of ebony, rosewood or other hardwood. On some guitars a maple neck and fingerboard are made from one piece of wood. A few modern luthiers have used lightweight, non-wood materials such as carbon-fiber in their fingerboards.Parameters
Typically, the fingerboard is a long plank with a rectangular profile. On a guitar, mandolin, ukulele, or similar plucked instrument, the fingerboard appears flat and wide, but may be slightly curved to form a cylindrical or conical surface of relatively large radius compared to the fingerboard width. The radius quoted in the specification of a string instrument is the radius of curvature of the fingerboard at the head nut.Most bowed string instruments use a visibly curved fingerboard, nut and bridge to provide bow clearance for each individual string.
The length, width, thickness and density of a fingerboard can affect timbre. Most fingerboards can be fully described by these parameters:
- w1 — width at nut
- w2 — width at half of scale length
- h1 — profile height at nut
- h2 — profile height at half of scale length
- r — radius
Radius
| 1 | Flat | Both nut and bridge are flat. The strings are all in one plane, and the instrument does not have a radius. | |
| 2 | Cylindrical | The fingerboard has a constant radius, and the fingerboard, the nut and the bridge all have the same nominal radius. | |
| 3 | Conical | The fingerboard has a varying radius, usually linearly progressing from to. Sometimes it is also called a compound radius. The nut and bridge are both curved but the nut radius is smaller than that of the bridge. | |
| 4 | Compound | While not strictly conical, with a curved nut and linear bridge. All parts of the fingerboard have some curvature, but the fingerboard shape is not strictly a cone. | , usually |
Notes:
- is a scale.
- designates a place on fingerboard, changes from 0 to .
- describes radius depending on place on fingerboard.
- is a non-linear function.
For guitars, some players feel that smaller radii are more comfortable for chord and rhythm playing, while larger radii are better for fast soloing. Conical and compound radius fingerboards try to merge both these features. The nut end of the fingerboard has a smaller radius to ease in forming chords. The bridge end of the fingerboard has a larger radius to make soloing more comfortable and prevent "noting out", in which a string comes in contact with a higher fret during bends.
A Brief History Of Discovering The Conical Fingerboard in 1978 by luthier Denny Rauen can be found in American Lutherie #8/Winter 1986 and String Instrument Craftsman May/June 1988 under the title "Multi-Radius Fingerboards".
This special radiusing is a standard on many of Denny's custom-built guitars and refret work beginning in 1978. Denny Rauen's articles on the "Multi Radius Fingerboard" are the first published documents on using a conical fingerboard to improve string bending while retaining comfortable chording.
Bowed string instruments usually have curved fingerboards, to allow the player to bow single strings. Those of the modern violin family and the double bass are strongly curved, however those of some archaic bowed instruments are flat.
Examples
Examples of some instruments' fingerboard radius parameters:| Model | r | w1 | w2 |
| Vintage Fender Stratocaster guitar | 7.25" | - | - |
| Modern Fender Stratocaster American guitar | 9.5" | 1 11/16" | - |
| Gibson guitars | 12" | 1.68" | - |
| Danelectro guitars | 14" | - | - |
| Ibanez guitars | RG and S series: 15.75"-17". Artcore: 12". SZ | - | - |
| Jackson guitars | 16" or compound, from 12" to 16". A compound radius is common on their newer models | - | - |
| Warmoth guitars | Compound, from 10" at nut to 16" at heel. | - | - |
| PRS Guitars Regular | 10" | 1 21/32" | 2.25" |
| PRS Guitars Wide Fat and Wide Thin | 10" | 1 11/16" | 2.25" |
| PRS Guitars 513 | 10" | 1 43/64" | 2 3/16" |
| PRS Guitars Hiland | 10" | 1 21/32" | 2 7/32" |
| PRS Guitars Santana | 11 1/2" | 1 21/32” | 2.25" |
| PRS Guitars Custom 22/12 | 11 1/2" | 1 47/64" | 2 19/64" |
| Most electric guitars with LSR roller nuts | 9.5" to 10" | - | - |
| Most electric guitars with Floyd Rose bridge | 10" | - | - |
| Traditional Classical guitars | flat | Variable by maker | Variable by model |
| Martin acoustic guitars | 16" | Variable by model | - |
| Gibson acoustic guitars | 12" | - | - |
| Full size violin | 42 mm | 24 mm | 40 mm |
Scalloping
A fretted fingerboard can be scalloped by "scooping out" the wood between each of the frets to create a shallow "U" shape. The result is a playing surface wherein the players' fingers come into contact with the strings only, and do not touch the fingerboard.The process of "scalloping" a fingerboard well, if done by hand, is tedious work, usually done by careful filing of wood between the frets, and requires a large investment of time. Consequently, it is relatively expensive to have done. Generally, luthiers scallop fingerboards with a special milling machine that has 22 or 24 wood cutting tools. This equipment saves time and adds precision to the process of scalloping the wood in the neck's radius the same in all fret spaces.
Scalloped fingerboards are most commonly used by shred guitarists, most notably, Ritchie Blackmore and Yngwie Malmsteen, who have signature models developed with Fender. Ibanez JEM series guitars, designed and played by Steve Vai, come standard with the last 4 frets scalloped. In 2008 Ibanez made available their E-Gen model, a Herman Li signature, which includes four scalloped frets. Karl Sanders of the death metal band Nile also uses several guitars with scalloped frets, including several Deans, and KxK Guitars.
In the 1970s, English guitarist John McLaughlin played with Shakti, along with Indian violinist L. Shankar, using an acoustic guitar with a fully scalloped fretboard. He also used an electric guitar with scalloped fretboard on album and live performances from 1978 till 1979. McLaughlin explained that this feature increased the ease and range of string bends by eliminating friction between finger and fretboard. The scalloped fretboard also facilitates the rapid, microtonal variation that is important in Indian music, as exemplified by classical Indian Sitar music. Without scallops, the guitarist must play microtones by sliding the string sideways on the fret.
Experimental luthier Yuri Landman made an electric guitar for John Schmersal of Enon called the Twister with a partial scalloped neck for only the thin strings,.
Other examples of lutes with scalloped fretboards include the South Indian veena and Vietnamized guitar.The Japanese multi-instrumentalist and experimental musical instrument builder Yuichi Onoue made a deeply scalloped electric guitar for Vietnamese microtonal playing techniques.
Scalloping can be:
- Partial, some of the high frets are scalloped for fast soloing. Popular examples include half scalloping or few top frets scalloping, used by such guitarists as Steve Vai. When done by hand, sometimes fretboards can be scalloped half below D or G string, as in the case for Turkish luthier Kenan Turgut.
- Full, i.e., all frets from the first to the last are scalloped
- Extreme scalloping has lateral intrusions in addition to the standard vertical hollows. The additional versatility in note control comes at the cost of substantially reduced rigidity of the neck.
Advantages and disadvantages
The "scooped out" nature of scalloped fingerboards creates a number of changes in the way the guitar plays. Most obvious, is that the fingertip only contacts the string, not the fingerboard itself, creating less friction for bends and vibratos, which results in more overall control while playing.However, that is also one of the main disadvantages. Many players, especially new players, may find a scalloped fingerboard too different to play easily, especially if the strings are light for the player or the player tends to press too hard. It takes practice to play in tune on a scalloped fingerboard. The player must first become accustomed to not actually touching the fingerboard. Playing a scalloped fingerboard requires a careful application of pressure: too much sharps the fretted note, as during a bend, and too little pressure causes fret buzz. As a result, most guitar players use a traditional fingerboard on their instruments.