Anatomy of a Classical Guitar

 Anatomy of a Classical Guitar

Anatomy of a Classical Guitar

The Classical Guitar consists of
approximately 40 major wooden parts, 
all glued together to hold their idle state…..
…..but did you know????

It’s always darkest before dawn. So if you’r e going to steal your
neighbor’s newspaper, that’s the time to do it.

Always remember that you’re unique. Just like everyone else.

Never test the depth of the water with both feet.

Before you criticize someone, you should walk a mile in their shoes.
That way, when you criticize them, you’re a mile away and you have their shoes.

If at first you don’t succeed, skydiving is not for you.

Give a man a fish and he will eat for a day. Teach him how to fish, and
he will sit in a boat and drink beer all day.

 Good judgment comes from bad experience.

There are two theories to arguing with women. Neither one works.

Never, under any circumstances, take a sleeping pill and a laxative on
the same night.

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Neck Woods…

Classical Guitar Necks

Necks of Richard Prenkert  Zimnicki Guitars  Trinity Guitars  McGill Guitars Christopher Carrington

There are a number of factors that determine the tonal properties of wood for a classical guitar neck. The wood can respond differently in the hands of different makers and/or different models of guitars. Distinctions can be subjective. Materials of the neck and fret board along with the quality of each individual piece can have a significant bearing on tone. Honduras Mahogany necks help to create a warmer tone. Brazilian Rosewood adds sparkle and ring. Indian Rosewood can help fatten up the midrange. Maple necks can create bright tone. Spanish Cedar & Figured Koa are often used. The grain of the neck should be straight and consistent. Irregular grain, susceptible to humidity changes, can cause performance problems. The neck may be reinforced with carbon fiber rods, ebony reinforcement strips or equipped with an adjustable truss rod to maintain the proper relief demanded by many of today’s players. The shape & width of the neck are probably the most personal element of a classical guitar. They affect how easily one can move on or up and down a neck.

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Classical Guitar Neck Construction

 

 

 

Two methods of cutting the neck out of a block of wood.

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The Headstock…

Classical Guitar Headstock

 

Headstock of Jose Oribe

The uppermost part of the neck, above the fingerboard nut, holds the tuners on a guitar. The headstock is slanted to increase string tension to the fingerboard nut. Makers know the size and weight of the headstock can alter the balance, tone, clarity & sustain of the guitar. The shape & size of the crown of the headstock can be a trademark.

 

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Headstock Veneer…

Classical Guitar Headstock Veneer

Headstock Veneers of  Christopher Carrington  Peter Oberg  &  Rodriguez Guitars

The Headstock veneer is a thin slab of wood added to the top of the headstock to hide the end grain appearance created by the slant of the headstock. Wood used for the veneer can be highly figured as in flaming koa or plain ebony to highlight an inlay or the unique shape of a headstock.

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The Tuners…

Classical Guitar Tuners

An improperly wound string is the number one culprit of tuning problems. If the string is not properly wound around the tuner post it will slip (See How to change Classical  Guitar Strings.) An attempt to rotate the roller (instead of the knob) of a set of tuners (of any quality) is impossible without stripping its gears or bending the mounting plate. Tuners don’t slip, strings do.

Classical Guitar Tuner Knobs

Knob– Often plastic, ivory, bone or ebony.

Mounting Hole– Spacing often varies with different brands.
Gear Screw– First place to look when tuner rattles.
Mounting Plate– If the plate bends the gears will break or slip.
Tuning Gear– Gears with zero play make for better tuning.
Roller– Usually plastic, Sometimes ebony or aluminum.
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The Fingerboard…

Classical Guitar Fingerboard

Fingerboard of McGill Guitars

The fingerboard of the classical guitar is generally ebony.  Ebony is hard, durable and black in color. An alternate wood for the fingerboard is Indian Rosewood. Rosewood is softer than ebony with varying browns in color. The grain of the fingerboard should be straight and consistent. Irregular grain, susceptible to humidity changes, can cause performance problems.

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Cleaning & Treating the Fingerboard…

Cleaning & Treating the Classical Guitar Fingerboard

The fingerboard can be rubbed with boiled linseed oil on a cheesecloth.
This will remove any playing grime on the fingerboard.
Also, this will moisten the fingerboard to prevent cracking. 
Follow with plain cheese cloth to remove remaining linseed oil.

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The Frets…

The Classical Guitar Fret

Classical guitar strings are made out of soft materials chosen for their ability to create tones & dynamics sought after by today’s classical guitarists. Their soft nature requires a softer fret than frets commonly used on electric or steel string guitars. If the latter were used classical guitar strings would wear out much faster than we are accustomed to. Taking into account string settling (stretching of new strings), one would spend more time restringing & tuning his guitar than playing. Checking a Classical Guitar FretSofter frets translates to longer string life. On the down side, the compulsive practicing and performing of classical guitar players takes a mighty toll on guitar frets. They wear away, become coarser and shift the string’s contact point off-center toward the bridge causing a note to play sharp. Unevenly worn frets cause varying clearances from note to note affecting balance, tone, clarity & sustain and along with that, they….they…they start to shorten your string life. What? Take care of your frets to lengthen your string life! A thin piece of paper can reveal a loose fret. (See Dressing the Frets on a Classical Guitar)

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The Heel…

Classical Guitar Heel

 

Heel of Trinity Guitars

The heel has both function & beauty.
It acts as a truss transferring the string tension to the back of the guitar.Classical Guitar Heel 2
It can act as a marker for the upper positions of the fingerboard.
The shape & size of the heel can be a maker’s signature.

The Heel of a Rodriguez Guitar

Classical Guitar Heel 3

 

 

 

Two methods of building a heel out of a block of wood.

 

 

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Inlays…

Classical Guitar Inlays

Inlays by Pimentel & Sons Guitars

Inlays add beauty and personalize a guitar.

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The Fingerboard Nut…

Classical Guitar Scalloped Fingerboard Nut

 

The Fingerboard Nut, located at the top of the fingerboard, determines string spacing and string height at the first fret (measured from the top of the fret to the bottom of the string). Factory made fingerboard nut slots tend to be on the high side. Due to differing climate conditions, this is done to ensure that the guitar won’t buzz when it reaches its destination.

Common Fingerboard Nut Materials

Bone-Dense & durable but somewhat inconsistent.
Less porous bone more desirable. 
White in color.
Fossilized Ivory-Denser than bone. White in color.
Fossilized Walrus Ivory-Dense and a very good conductor of vibrating energy. Increased volume & sustain, better note-to-note clarity & improved tone. Varying brown in color.
Tusq®-Man-made material quickly gaining in popularity for increased volume and sustain. White in color.
Graphite-Popular on electric guitars with tremolos for reduced string binding and breakage. Black in color.
Plastic-Factory equipped on cheap and moderate priced guitars. Functional but many are hollow, soft and/or spongy with reduced sustain. White in color.
Corian®-Synthetic material used on many Martin® guitars. Density more consistent than bone. White in color.
Brass or Aluminum-Not very common or recommended. Brass or Aluminum in color.
Ebony-Most often seen on earlier instruments. Black in color.

Zero Fret-By duplicating fret material, thought to sound closest to a fretted note, but lacks dampened effect of the finger. Color matches frets.

Classical Guitar Bridge Saddle 3

The colors of Bone, Ivory, Fossilized Ivory & Ebony

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Fingerboard Nut Height…

Classical Guitar Fingerboard Nut Height

The height of the fingerboard nut is a variable measurement. Height can vary with saddle height, string tension and diameter, angle of right hand attack, dynamic range of a player or style of player. The lower the string height the easier it is to barre a chord in the first position, but pull-offs on the first fret can be compromised at too low of height. One method of determining slot height that will take these variables into account is to first adjust the bridge saddle to a desirable height with the strings to be used. With the string pressed to the first fret, measure the string height at the second fret (measure from the top of the fret to the bottom of the string). Multiply the measurement by two. The new measurement will represent the string height at the first fret of the open string.

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String Spacing of the Fingerboard Nut…

Classical Guitar String Spacing of the Fingerboard Nut

This spacing performs well but looks uneven in appearance
because the spaces become the focal point.

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Classical Guitar String Spacing of the Fingerboard Nut 2

This spacing confuses the left hand 
with varying spaces to string centers.
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Classical Guitar String Spacing of the Fingerboard Nut 3

This spacing performs well & looks good.
It is devised by first spacing the slots at the string centers,
then as slots are filed, slightly altering the spacing.

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Width & Height of Slots…

Classical Guitar Width & Height of Fingerboard Nut Slots

The width of the slots (A) are determined by the diameter of the strings. An undersized slot can cause a pinching of the string creating tuning problems. An overly wide slot may cause the string to vibrate in the slot losing volume, balance, tone, clarity & sustain. The slot should follow the shape of the string at the bottom and slightly widen at the sides. The width at the “wings” (B) of the fingerboard nut is roughly half of dimension C, but B may vary to accommodate the taper of the fret ends. Slot height (D) is typically 1/2 the diameter of the widest string.

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Slot Angle & Shape…

Classical Guitar Fingerboard Nut Slot Angle & Shape

Typically the top of the fingerboard nut is parallel to the plane of the headstock. The bottom of the string slots repeats this angle with its edge closest to the fingerboard very pronounced. A poorly shaped edge at this point would cause a loss in volume, balance, tone, clarity & sustain. The edge of the slot closest to the tuners is less pronounced and slightly rounded toward the top of its corresponding tuning roller.

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The Soundboard…

Graduating the Top of a Classical Guitar

Graduating the Top of a Joshua Alexander French Guitar

The top of the classical guitar is most commonly made of solid book-matched spruce or cedar.

Classical Guitar Top Sitka Spruce
Sitka Spruce
 has a high strength-to-weight ratio. It is an ideal soundboard, especially for aggressive playing styles and/or large instrument sizes. Spruce ages well, is harder and possibly more durable than cedar, gives a crisp, more focused sound, and provides excellent treble response. Spruce tops require a longer break-in time than cedar. Light blonde in color.

Engleman Spruce Top for Classical Guitar

Engleman Spruce is not as stiff as Sitka, but popular because of its appearance. Works well on smaller bodied instruments because of its lower stiffness. It has a beautiful sheen much like the European spruces with less contrast between its growth rings. Usually looks whiter than Sitka.

Western Red Cedar Top for Classical Guitar Western Red Cedar is not as stiff as the spruces, which makes it ideal for lower tension or smaller bodied instruments. It has a warmer tone with excellent bass response and will produce a mature tonal quality more quickly than a spruce top. Color varies from light reddish to a light chocolate brown.

Classical Guitar top by Pimentel & Sons

 

Guitar top by Pimentel & Sons

  A soundboard has two purposes on a guitar, one as a stable anchor for the strings, and the other as the vibrating unit with which to move air (produce sound). This dual purpose makes stiffness such an important quality. Too much stiffness will dampen the tone. With too little stiffness the top will distort. Along with strength, wood is chosen for its appearance and consistency.

 

Classical Guitar Cedar Top

 

The soundboard grain should be straight, parallel and consistent with tight annual rings. These characteristics add stiffness which helps the builder have more control in the final outcome of a guitar top.

Bearclaw Top on a Classical GuitarA Bearclaw Top by Rodriguez Guitars

Some tops have a “silky” appearance (Soft grainy lines running perpendicular to the top.) Some makers like this and some don’t. If silk is present it should be present throughout the entire top. Another feature up and coming on classical guitar tops is “Bearclaw”. Bearclaw (like it sounds) looks like a bear used a tree to sharpen its claws and left nonsymmetrical small waves in the grain. Once considered inferior because of appearance, it’s now sought after because of its increase in density. Bearclaw tops have become popular on bluegrass guitars and may soon be seen as an alternative in Classical Guitar construction. A consistent and even color is desirable for higher grade guitars.

Classical Guitar Top Braces

 

A Top by Oberg Guitars

Guitar makers use a grading system to differentiate the quality in wood. Master Grade is awarded to one in a hundred (or more) tops (very rare). Master Grade is the best of the best. AAA is the second highest awarded for stiffness across the top, straight grain, quarter sawn, even color and consistent annular ring spacing. AA is given for slightly wider and/or inconsistent ring spacing or mild color variations. A is given for lack of stiffness, inconsistent ring spacing with visible cosmetic flaws. 

Inspecting a Top of a Classical Guitar

 

Inspecting a Top at Schneider
& Son

There are many factors that contribute to the overall sound of the guitar top.  Factors can include internal inner braces, thickness of material, pattern and shape of the instrument, type of finish, and type of strings, but a good piece of wood is a good start.

 

Classical Guitar Cedar Blocks

 

Processing Cedar Blocks for Soundboards at Jose Oribe Guitars

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The Back & Sides…

Classical Guitar Backs & Sides

 

The Backs & Sides of Jose Oribe

Traditionally the Back & Sides of the Classical Guitar were made of solid book-matched Rosewood, Mahogany or Cypress, but today’s builders have opened their horizons to a wide variety of choices.

Also see Wood Choices for the Back & Sides of a Classical Guitar Alternative Wood Choices for the Classical Guitar

 

Book-Matching a Back…

Classical Guitar Book-Matching a Back

A slab of wood. (A)
Split in half. (B)
Pivot one halve. (C)
Continue pivot. (D)

 

Classical Guitar Macassar Ebony Book-Matched

 

 

Macassar Ebony Book-Matched before Jointing.

 

 

 

Classical Guitar Bent Sides

 

The Bent Sides of Oberg Guitars

 

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The Sound Hole…

Classical Guitar Sound Hole

A Sound Hole of Pimentel & Sons Guitars

A vibrating guitar top creates sound. The air displacement, through the Sound Hole, is what amplifies the sound. Making the hole too small reduces the displacement and lowers volume. Too large a hole reduces velocity and in turn also lessens volume. The ideal size of a Sound Hole can vary with the size of the sound chamber.

Classical Guitar Sound Hole 2

 

 

A nontraditional Sound Hole by McGill Guitars

 

 

 

Classical Guitar Sound Hole 3

 

An Acoustic Port of Oberg Guitars

Sound Holes are not limited to a particular site or number.

Classical Guitar Sound Hole 4

 

The Tornavoz of  Joshua Alexander French

The Tornavoz is a conical tube beneath the soundboard that extends toward the back of the guitar. For more on the Tornavoz see Tornavoz.

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The Rosette…

Classical Guitar Rosette

The Rosettes of Oberg Guitars & Christopher Carrington

The rosette serves several purposes. It acts as a reinforcement to prevent cracking at the end grains of the sound hole area of the top. It also acts as a visual focal point to the beauty of the guitar and, by design, is personal to its maker.

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Making a Rosette by Joshua Alexander French

One of the areas on a guitar where a maker can truly express their artistic talent is the decoration surrounding the sound hole. The time consuming and meticulous intarsia found on the guitars of the great masters like Romanillos and Torres offer us a slight glimpse into the creativeness and spirit imbued in their instruments. Rarely are two examples exactly the same, yet often the work is readily recognizable and even copied. 
Rosettes are created from thousands of tiny pieces of wood, arranged in a specific pattern to achieve a design that is both aesthetically pleasing and unique. The uniqueness of the hand made rosette far exceeds the mass produced, and the designs can be manipulated according to the feelings and judgment of the maker for each individual instrument. I feel that guitar making is a contemplative and deeply personal craft – and I seek to imbue my guitars with spirit and life. A guitar maker presents himself to the world through the quality and creativeness of his work. I take a personal interest in every guitar I make on every level, and it stays with me. Every guitar I’ve made reiterates to me who I was and what I felt at the time in a very specific way when I’m able to see it again. The small details, though they may go unnoticed upon a cursory glance, truly have a connection to the personality of the maker. 
For these reasons I have spent the past two years experimenting with and refining rosette designs until I finally had a design that fulfilled my vision for my guitars. I’ve worked at length with an extremely talented sculptor in developing a sense of aesthetics that is refined and complicated, yet appears simple and effective. 

Classical Guitar Rosette 2

Most rosettes are made from a mosaic of veneers of various colors glued together to create an attractive pattern. While in most cases I prefer the traditional approach I have given a lot of thought to the construction of the classic Romanillos rosette and chose a method inspired by it. The difference is that instead of gluing veneers together to create a design made up of tiny squares of the same shape, this method requires different pieces of wood to be of different sizes and shapes to execute the design. 
This rosette is new for 2004 and is the standard for my latest guitars. It is an interwoven design made of only natural woods – nothing dyed. It is achieved by creating a log from which the pieces of the central motif are sawn and inlaid in a circle just slightly larger then the circumference of the sound hole. Later, decorative borders are added to complete the design. When finished the rosette contains more than 3300 individual pieces of wood.

Classical Guitar Rosette 3A completed Rosette created by Joshua Alexander French

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The Edge Binding…

Classical Guitar Edge Binding

Edge Binding of Joshua Alexander French

The Edge Binding protects the end grains of the top and the back. It also doubles as a decorative trim at the borders of the guitar.
The Binding on a Classical Guitar is generally made of layered wood.

Classical Guitar Edge Binding 2

 

 

 

Flamed Maple Binding of Richard Prenkert

 

Classical Guitar Edge Binding 3

 

 

Trimming the Binding of a Conde Hermanos Guitar

 

 

 

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The Backstrip…

Classical Guitar Backstrip

 

A Center Seam Backstrip of Rodriguez Guitars

The Backstrip, usually made of wood, will match or compliment the guitar’s edge binding. It will also reinforce the center seam of a book-matched back.

Classical Guitar Backstrip 2

Channeling the backstrip

 

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The Neck Block…

Classical Guitar The Neck Block

The Neck Block of a Classical Guitar by Zimnicki Guitars

The Neck Block is often made of mahogany and along with the neck, supports the book-matched back, top & sides.

 

Classical Guitar Neck Block

 

 

 

A Neck Block by Oberg Guitars

 

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The Neck Joint…

 

Classical Guitar Neck JointOne method of attaching the neck to a Classical Guitar body is the use of a Dovetail Joint. It holds well and can be detached during future guitar repairs.
Classical Guitar Neck and BlockThis Neck and Block combination is cut from one piece of wood. It makes a very strong attachment but can be a nightmare to repair.

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The Classical Guitar Braces…

Classical Guitar Fan Bracing

 

Fan Bracing on a Top by Trinity Guitars

Generally made of spruce, braces add stiffness to the top. The wood chosen is very straight grained running the length of the brace.

 

Classical Guitar Braces

 

 

Fan braces being glued to the soundboard
of guitar by Joshua Alexander French

 

 

Classical Guitar Braces 2

 

 

Lattice Bracing of a Top by Rodriguez Guitar

 

 

Classical Guitar Braces 3

Back Braces of Oberg Guitars

Classical Guitar Braces 4

 

Parabolic Braces By Trinity Guitars

Four Parabolic Braces in the lower sections of the back
add tremendous stiffness to the back.

 

 

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The Classical Guitar Bridge Plate…

Classical Guitar Bridge Plate

Bridge Plate on a top by Joshua Alexander French

The Bridge Plate adds strength to the top under the bridge area.
The straight wood grain runs perpendicular to the top.

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Center Seam Reinforcement Strip…

Classical Guitar Center Seam Reinforcement Strip

Two Piece Backs by Joshua Alexander French

A strip of wood is added to the seam of a book-matched back for reinforcement.

 

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The Kerfing…

Classical Guitar Kerfing

Guitar Kerfing (guitar lining) is tapered strips of wood glued around the inside seams of a guitar to add strength and stability where the sides meet the top and back. Kerfing has spaced slits that render the wood strip flexible.

Classical Guitar Kerfing 2

 

The solid unslotted lining of a Rodriguez Guitar

Linings don’t have to be slotted. Solid pieces of wood can be used in their place. Both do a wonderful job.

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The End Block…

Classical Guitar End Block

 

 

The End Block supports the book-matched back, top & sides.

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The Bridge…

Classical Guitar Bridge

Through the saddle, the bridge transfers the vibrating energy of the string to the top of the guitar.

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The Bridge Tie Block…

Classical Guitar Bridge Tie Block

 

The Bridge Tie Block of a Rodriguez Guitar

Often where the strings fasten (Bridge Tie Block)
a strong cosmetic veneer is added.
This adds character to the bridge and also prevents the strings from marring into the bridge.

Classical Guitar 18 hole Bridge

 

 

An 18 hole Bridge by Joshua Alexander French

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The Bridge Saddle…

Classical Guitar Bridge Saddle

Typically made of bone, the saddle transfers the vibrating energy of the string to the top of the guitar. The bridge saddle is not glued to the bridge, but rather held in place by the tension of the strings. The height of the saddle is determined by the guitar’s neck angle, therefore it is not measured itself but rather measured for an optimal string height at the twelfth fret. Traditionally the bass strings are higher than the trebles, but crossover players are setting their heights more equal.

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Classical Guitar Bridge Saddle 2

With proper string height and neck relief,
if a saddle is too:
Low -Loss of volume, tone & sustain
High -Too much torque on the top. Top will distort. Bridge may lift or split.
Medium -Allows for adequate adjustments thru the seasons.

.Classical Guitar Fingerboard Nut ColorsThe colors of Bone, Ivory, Fossilized Ivory & Ebony

A few materials used for a bridge saddle.

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The Strings…

Classical Guitar String

Choices of brands, alloys, tensions, tonality, durability and feel can vary as much as the make and models of guitars themselves. An increase of silver in a string may improve tone, but shorten durability. Scale length, string height, style of attack or even hardness of frets can  alter ones opinion of strings.
A choice of strings may be decided by the music itself. High tension strings might be chosen to perform Morning (by Grieg) because of its/their dynamic range, while low tension strings may be more suited for Prelude in G Minor (by Rachmaninoff) to achieve a driving, raw, gritty sound and ease left hand fingerings.

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A Cut-a-Way…

Classical Guitar Cut-a-Way

 

 

A Cut-a-Way by Jeroen Hilhorst

A Cut-a-Way body allows for easier access to the upper areas of the fingerboard.

 

 

Classical Guitar Cut-a-Way 2

 

 

 

A Cut-a-Way by Ganz Guitars

 

 

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The Label…

Classical Guitar Label

 

A Label for the Muriel Anderson Model Guitar by
McGill Guitars

The Label generally identifies the
maker, origin, model, serial number
and the approximate date the guitar was built.
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Adhesives for Building & Repair…

Classical Guitar Adhesives

There are many glues to choose from for building and repairing. Traditionally, hot hide glue is used in making classical guitars. It has good strength and is fairly easy to separate for repairs. Titebond is slightly more aggressive and withstands weather conditions better. Contact cements are used to adhere plastic to wood and epoxies are sometimes used as a last resort in some repairs. Another family of adhesives gaining acceptance for certain applications is Cyano-Acrylate Glue (super glue).

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Classical Guitar Finishes…

 

Classical Guitar French Polished Shellac

French Polished Shellac- French polishing is a method of applying finish to wood by hand with a cotton pad. Most of the fine classical guitars being hand made today are French Polished. It is a highly-prized and desired finish for both its visual and tone enhancing characteristics.  The texture, luster and color of the wood are enhanced under a French polish finish. It is thin and flexible and produces the clearest and most natural sound. Multiple polishing sessions are required over many weeks to achieve the best results.  The finish dries to the touch almost immediately but can takes months to fully cure.  Even though it is thin and flexible it is not very protective against even minor physical abuse.

Classical Guitar Oil Finsh

Oil Finish- Most oil finishes available are either a linseed oil or a tung oil. These oil finishes are actually varnishes and have an appealing natural luster. They are easy to use and produce a hard, thin and flexible finish, although not as protective and durable as a lacquer finish. 

Classical Guitar Nitrocellulose Lacquer

 

Nitrocellulose Lacquer- Used since the 1920’s, a quick-drying solvent-based lacquer that contains nitrocellulose. A very hard yet flexible, durable finish that can be polished to a high sheen. With age, yellows, producing a desired vintage look.

 

Classical Guitar Combining Finishes

 

Combining French Polished Shellac & Nitrocellulose Lacquer- Many guitar makers are now combining both. They are using French Polish for the soundboard because of the finish’s tonal characteristics and Nitrocellulose lacquer for the rest of the guitar for its durability.

Classical Guitar Acrylic Lacquer

 

Acrylic Lacquer- Originally used on cars, it is similar to nitrocellulose lacquer, but dries quicker and harder. With age, does not produce the vintage look.

 

Classical Guitar Water-Based Lacquer

Water-Based Lacquer- With personal health and environmental concerns the long-term trend is moving away from solvent-based finishes.  In response, many manufacturers set a goal to create a lacquer with all of the positive characteristics of current solvent-based lacquers but without the hazardous, toxic solvent base. Water-Based Lacquer is environmentally friendly and produces “acceptable” results.

 

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