Usually the scoop is slightly greater on the bass side, less on the treble side of the fingerboard. Scalloped fingerboards are most commonly used by shred guitarists , most notably, Ritchie Blackmore and Yngwie Malmsteen , who have signature models developed with Fender. Shankar , using an acoustic guitar with a fully scalloped fretboard. Thus, high points of each surface can touch, but "valleys" do not. In Ibanez made available their E-Gen model, a Herman Li signature, which includes four scalloped frets 21st to 24th. 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. Furthermore, he found that the bearings were more damaged for long-distance shipping of the cars and that the season of shipping also had an influence. McLaughlin explained that this feature increased the ease and range of string bends by eliminating friction between finger and fretboard.
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. Nylon or gut strings require the most, and solid steel-core strings the least. Consequently, it is relatively expensive to have done. Good modern headsets incorporate a plain bearing to accommodate this flexing, leaving the ball race to provide pure rotational movement. The additional versatility in note control comes at the cost of substantially-reduced rigidity of the neck. Advantages and disadvantages[ edit ] The "scooped out" nature of scalloped fingerboards creates a number of changes in the way the guitar plays. As a result, most guitar players use a traditional fingerboard on their instruments. Different string materials or different styles of playing may call for differing amounts of scoop. For comparison between simulation and experiments, the friction work density is used, which is the product of friction coefficient, slip and local pressure. 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. For example, generators or pumps may fail or need service, so it is common to have a nearby spare unit which is left off most of the time but brought into service when needed. Popular examples include half scalloping 12th to the last fret, used by Kiko Loureiro of Angra ,  among others or few top frets scalloping 19—24, 17—22, etc. The broken-off pieces are also called wear debris. Ibanez JEM series guitars, designed and played by Steve Vai , come standard with the last 4 frets scalloped. The result is a playing surface wherein the players' fingers come into contact with the strings only, and do not touch the fingerboard. Until recently, bicycle headsets tended to suffer from false brinelling in the "straight ahead" steering position, due to small movements caused by flexing of the fork. Wear debris is bad because it is relatively large compared to the surrounding surface finish and thus creates more regions of high contact stress. However, that is also one of the main disadvantages. Karl Sanders of the death metal band Nile also uses several guitars with scalloped frets, including several Deans , and KxK Guitars. In Ibanez made available their E-Gen model, a Herman Li signature, which includes four scalloped frets 21st to 24th. It takes practice to play in tune on a scalloped 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. When that unit is turned on, the bearings may be noisy due to damage, and may fail completely within a few days or weeks   even though the unit and its bearings are otherwise new. Especially the pitch bearing,  which is used under oscillation, shows often false brinelling damages. Surprisingly, however, vibration from the operating unit can cause bearing failure in the unit which is switched off. Shankar , using an acoustic guitar with a fully scalloped fretboard. 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.
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