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The clarinet mouthpiece table length is the distance from the mouthpiece tip to the end of the flat surface where the reed sits. It directly affects reed sealing, response, and tonal character. Players should evaluate table length together with tip opening and facing curve when selecting, measuring, or modifying a mouthpiece.
In This Article
What is clarinet mouthpiece table length?
Clarinet mouthpiece table length is the measured distance from the very tip of the mouthpiece to the point where the flat reed-bearing surface ends and the curved shank begins. This flat surface is called the table. Table length is distinct from facing length and tip opening, but all three interact to shape response, resistance, and tone.
On most modern Bb clarinet mouthpieces, table length falls within a fairly narrow range, yet small differences of 0.5 to 1.0 millimeter can noticeably change how the reed seals and vibrates. Understanding this measurement helps players compare mouthpieces intelligently and diagnose problems such as leaks, instability, or uneven response.
Typical Bb clarinet mouthpiece table length: 21.5 mm to 24.0 mm on many contemporary models, with many orchestral-style pieces clustering around 22.5 mm to 23.5 mm.
Why mouthpiece table length matters: tone, response, and sealing
Table length matters because it controls how the reed lies on the mouthpiece, how completely it seals, and how it flexes along the facing curve. A table that is too short or too long for a given facing design can compromise response, articulation clarity, and tonal stability across registers.
If the table is too short relative to the facing, the reed butt may overhang the flat surface, leading to leaks at the back of the reed, fuzzy attacks, and unstable low notes. If the table is too long, the reed may sit too far back, increasing resistance, stiffening response, and dulling the tone, especially at softer dynamics.
Table length also influences how the reed balances between the tip and the ligature. This balance affects how quickly the reed starts vibrating, how easily it releases in staccato, and how evenly it responds when you move between chalumeau, clarion, and altissimo registers. Small changes in table length can shift this balance noticeably.
Clarinet mouthpiece anatomy: where table length fits
To understand table length, it helps to see how it fits into the overall anatomy of a clarinet mouthpiece. Each part interacts with the reed and the air column. Knowing these relationships clarifies why table length cannot be evaluated in isolation from facing length, tip opening, and internal dimensions.
Tip
The tip is the very front edge of the mouthpiece where the reed first leaves the table and begins to curve away. Tip opening is the distance between the reed and the tip at rest. This opening, combined with the facing curve and table length, determines resistance and response. A given tip opening can feel very different with a shorter or longer table.
When you measure table length, you always start at the tip, not at the beginning of the facing curve. The tip is the reference point that allows you to compare different mouthpieces and relate table length to facing length and reed placement.
Facing curve
The facing curve is the curved surface that begins at the end of the flat table and continues to the tip. It is where the reed gradually lifts away from the mouthpiece. Facing length is the distance from the tip to the point where the reed first makes full contact with the mouthpiece under light pressure.
Table length and facing length are related but not identical. The table is perfectly flat; the facing curve is intentionally curved. A mouthpiece can have a relatively long table but a medium facing length, depending on where the curve begins and how it is shaped. Confusing these two measurements leads to misinterpretation of specs.
Table
The table is the flat surface where the reed lies when at rest. Table length is the distance from the tip to the back edge of this flat area. The table must be flat, smooth, and properly sized so the reed seals along its entire contact area without rocking or leaking.
Any twist, warp, or unevenness on the table can cause leaks and inconsistent response. Even when the table is perfectly flat, an unsuitable table length for a given reed cut or facing design can cause the reed butt to sit awkwardly, changing the balance of vibration and resistance.
Rails
The rails are the narrow side edges of the facing that run from the tip down along the sides of the reed. They help define the seal between reed and mouthpiece and influence how the reed flexes laterally. Rail thickness and symmetry interact with table length to determine how securely the reed seats on the mouthpiece.
If the table length positions the reed butt too far forward or back, the ligature may clamp unevenly over the rails, causing leaks or dead spots. Proper table length helps keep the reed centered and stable over the rails under ligature pressure.
Chamber
The chamber is the internal cavity inside the mouthpiece that leads into the barrel and upper joint. Its size and shape strongly affect timbre, intonation tendencies, and projection. Table length does not change the chamber directly, but it influences how the reed excites the air column feeding into that chamber.
For example, a mouthpiece with a relatively large chamber and a longer table may feel more resistant but offer a darker, more focused sound. A shorter table on a similar chamber might feel freer but could require more embouchure control to maintain pitch stability and core.
Key distinction: Table length is the flat surface distance (tip to table end). Facing length is the vibrating curve distance (tip to first full reed contact). They are related but not interchangeable measurements.
How to measure table length accurately (step-by-step, tools & diagrams)
Accurate table length measurement helps you compare mouthpieces and document setups. You do not need a full machine shop, but you do need precise tools and a careful method. The goal is to measure from the tip to the exact end of the flat table, not to the start of the cork or shank curve.
Recommended tools
For reliable measurements, use at least one precision tool. A simple ruler is usually not accurate enough for fine comparisons. Technicians and serious players typically use digital calipers or a machinist's rule and a reference block.
- Digital calipers with 0.01 mm resolution
- Small machinist's square or straightedge
- Bright directional light or desk lamp
- Non-marring surface (cork sheet or soft cloth)
- Optional: mouthpiece gauge plate for checking flatness
Step-by-step measurement procedure
Use this method with digital calipers. If you use a machinist's rule, adapt the same reference points and visual checks. Work slowly and repeat measurements to confirm consistency.
- Clean the table and tip gently so no debris affects the measurement.
- Place the mouthpiece table-up on a soft, stable surface with the tip pointing toward you.
- Open the calipers slightly wider than the expected table length.
- Place the fixed jaw of the calipers gently against the very tip of the mouthpiece.
- Slide the movable jaw along the table until it aligns exactly with the point where the flat surface ends and the curve into the shank begins.
- Use side lighting to see the transition from flat to curved; the end of the flat is your reference point.
- Read the measurement in millimeters and record it.
- Repeat at least twice to ensure you get the same value within 0.1 mm.
Text-based diagram of the measurement
Top view (table up): [ TIP ]--------------------------[ END OF TABLE ]~~~~(curved shank) ^ ^ | |
Caliper fixed jaw Caliper moving jaw Measured distance = clarinet mouthpiece table length
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