Fingerboard

For other uses, see Fingerboard (disambiguation).

Fretted guitar fingerboard

Fretless violin fingerboard

The fingerboard (also known as a fretboard on fretted instruments) 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.

The word "fingerboard" in other languages sometimes occurs in musical directions. In particular, the direction sul tasto (Ital., also sulla tastiera, Fr. sur la touche, G. am Griffbrett) for bowed string instruments to play with the bow above the fingerboard. This reduces the prominence of upper harmonics, giving a more ethereal tone.^[1]

Frets

Six strings bass guitar fingerboard

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. Frets let the player stop the string consistently in the same place, and don't dampen string vibrations as much as fingers alone. 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. 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 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 (through using paint, or illuminated with light emitting diodes) 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 (carefully rounds and shapes) the ends and edges. Stainless steel guitar frets may never need dressing, because of the density of the material.^[2] 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. (There should be a slight relief to compensate for the elliptical shape of the vibrating strings.)

Materials

On bowed string instruments, (such as violin, viola, cello, and double bass), 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.^[3]

Parameters

Fingerboard profile looking from nut to bridge. Scheme and essential 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 (close to headstock)
w₂ — width at half of scale length (if fretted, usually the 12th fret)
h₁ — profile height (thickness) at nut
h₂ — profile height (thickness) at half of scale length
r — radius (may be non-constant)

Radius

Graphs of r(x) function for typical fingerboard profiles

Depending on values of radius r and their transition over the length of the fingerboard, all fingerboards usually fit into one of the following four categories:

1	Flat	Both nut and bridge are flat. The strings are all in one plane, and the instrument does not have a radius (the radius is in a sense infinite).	$r = \infty$
2	Cylindrical	The fingerboard has a constant radius, and the fingerboard, the nut and the bridge all have the same nominal radius (that of the fingerboard is strictly speaking a little smaller than that of nut and bridge).	$r = r_1 = r_2 = const$
3	Conical	The fingerboard has a varying radius, usually linearly progressing from $r_1$ to $r_2$ . Sometimes it is also called a compound radius.^[4] The nut and bridge are both curved but the nut radius is smaller than that of the bridge.	$r(x) = r_1 + \frac{x}{l}(r_2 - r_1)$
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.	$r(x) = f(x)$ , usually $r(l) = \infty$

Notes:

$l$ is a scale.
$x$ designates a place on fingerboard, changes from 0 (at nut) to $l$ (at bridge).
$r(x)$ describes radius depending on place on fingerboard.
$f(x)$ is a non-linear function.

Classical guitars, some 12-string guitars, banjos, dobros, pedal steel, and a few steel stringed acoustic guitars have flat fingerboards. Almost all other guitars have at least some curvature. However some recent five and six string electric basses have flat fingerboards.

For guitars, some players feel that smaller radii (7.25–10") are more comfortable for chord and rhythm playing, while larger radii (12"-16" and up to flat) 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"^[5] ("fretting 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
Modern Fender Stratocaster American guitar	9.5" (241 mm)^[4]	1 11/16" (42.8 mm)
Vintage Fender Stratocaster guitar	7.25" (184.1 mm)^[4]
Gibson guitars	12" (305 mm)	1.68" (43.053 mm)
Ibanez guitars	RG and S series: 15.75"-17" (400-430mm). Artcore: 12" (305mm). SZ (305mm)
Jackson guitars	16" (406 mm)^[4] or compound, from 12" (nut) to 16" (heel). A compound radius is common on their newer models
Warmoth guitars	Compound, from 10" at nut to 16" at heel.^[4]
PRS Guitars^[6] Regular	10" (254 mm)	1 21/32" (42 mm)	2.25" (57.1 mm)
PRS Guitars Wide Fat and Wide Thin		1 11/16" (42.8 mm)	2.25" (57.1 mm)
PRS Guitars 513		1 43/64" (42.4 mm)	2 3/16" (55.5 mm)
PRS Guitars Hiland		1 21/32" (42 mm)	2 7/32" (56.3 mm)
PRS Guitars Santana	11 1/2" (292 mm)	1 21/32” (42 mm)	2.25" (57.1 mm)
PRS Guitars Custom 22/12	11 1/2" (292 mm)	1 47/64" (44 mm)	2 19/64" (58.3 mm)
Most electric guitars with LSR roller nuts	9.5" to 10" (241 mm to 254 mm)^[4]
Most electric guitars with Floyd Rose bridge	10" (254 mm)^[4]
Traditional Classical guitars	flat (no radius)	Variable by maker	Variable by model
Martin acoustic guitars	16" (406.4 mm)	Variable by model
Gibson acoustic guitars	12" (305 mm)
Full size (4/4) violin	42 mm	24 mm	40 mm

Radius printable samples
6”
7 ¼”
9 ½”
10”
11 ½”
12”
16”
20”

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 (according to neck dimensions and number of frets) 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 (21st to 24th). 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 (band), along with Indian violinist L. Shankar, using an acoustic guitar with a fully scalloped fretboard. 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, (like little playground slides).

Other examples of lutes with scalloped fretboards include the South Indian veena and Vietnamized guitar (called đàn ghi-ta, lục huyền cầm, or ghi-ta phím lõm).The Japanese multi-instrumentalist and experimental musical instrument builder Yuichi Onoue made a deeply scalloped electric guitar for Vietnamese microtonal playing techniques.^[7]

Scalloping can be:^[8]

Partial, some of the high frets are scalloped for fast soloing. Popular examples include half scalloping (12th to the last fret, used by Kiko Loureiro of Angra,^[9] among others) or few top frets scalloping (19–24, 17–22, etc.), 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. This visually-striking modification was pioneered by Reverend Kriss Hades of Sadistik Exekution.^[10]

Note that filing away wood to scallop a fingerboard also touches inlays—so ornately inlaid fingerboards are not usually good candidates for scalloping. Simple dot or block markers survive the procedure well.

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.^[11]

Scoop of fretless bowed-string fingerboards

Fretless bowed-string fingerboards are usually scooped lengthwise in a smooth curve, so that if a straight edge is held next to the board parallel to a string, some daylight shows between them, towards the centre of the board. Usually the scoop is slightly greater on the bass side, less on the treble side of the fingerboard. Different string materials or different styles of playing may call for differing amounts of scoop. Nylon or gut strings require the most, and solid steel-core strings the least. A typical full-size (4/4) violin with synthetic-core G, D, and A strings shows 0.75 mm of scoop under the G string, and between 0.5 mm and zero scoop under the E, which is usually a solid steel core on modern instruments.

Dip of guitar fretboards

On guitars, specifically steel-string and electric guitars, the relief (or "dip") is adjustable by altering the tension on the steel truss rod inside the neck. Relaxing the truss rod allows the pull of the strings to increase the dip, and vice versa. Classical guitars do not need truss rods due to the lower tension of nylon strings, but should still exhibit some degree of dip.

Notes

↑ Macy, Laura (ed.). "Sul tasto". Grove Music Online. Oxford Music Online. Oxford University Press. (subscription required)
↑ Fret Leveling article at the Guitar Repair Bench Luthier Website
↑ Luthier David Rivinus' site explanation of why he doesn't use ebony fingerboards
1 2 3 4 5 6 7 Guitar neck radius article at Warmoth
↑ Mottola, R. (2014). Guitar Fretboard Camber and Action in the Context of String Bending. Savart Journal, 1(4)
↑ PRS Guitars FAQ: What are the differences between necks you offer?
↑ Yuichi Onoue on hypercustom.com
↑ Scalloped Guitar Necks article at Warmoth
↑ Archived October 29, 2008 at the Wayback Machine
↑ Axe-Wielding Maniac interview in Australian Guitar Magazine
↑ Ross, Michael (1998). Getting Great Guitar Sounds: A Non-technical Approach to Shaping Your Personal Sound. Hal Leonard Corporation. p. 15. ISBN 978-0-7935-9140-4.

References

Stringworks U brief description of fingerboard for violins, violas, & cellos
Violin construction detailed specification sheet by Alan Goldblatt (PDF, 18KB)
Fretboard Repair article explains common fretboard problems and repairs on the Guitar Repair Bench Luthier Website
Ibanez website gives specific neck/fingerboard dimensions
The Scalloped Fretboard Guitar article

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