Neck Relief Measurement Helper

What this tool is for

Convert and interpret a measured relief gap as a comparison—not a repair verdict. Measurement tools are useful only when the physical datum, unit, fret or position, instrument posture, and instrument state are recorded with the number.

Use it when you can describe the current state and need a defensible next check. It is not a shortcut around inspection: preserve the starting state, change one variable, and verify the result under the same conditions.

Before you begin

Tune the instrument, hold it in playing position, capo fret 1, fret the same string at the last fret or neck joint, and measure the middle-span gap with a feeler gauge.

Use a stable, tuned instrument unless the page specifically investigates tuning.
Name the physical reference, unit, and test condition beside every important number.
Keep the original measurements so any reversible change can be returned to baseline.

Input guide

Neck relief: records neck curvature under the stated capo, fret, position, and tuning method.
Input unit: sets the interpretation and display unit; do not mix units elsewhere in the same run.
Instrument: identifies the record so its result is not attached to the wrong instrument or work order.
Buzz location: classifies an observed condition; choose “unknown” or “not tested” instead of guessing when available.

Input labels describe evidence, not targets. A placeholder demonstrates format only; it is never a recommendation for a particular guitar.

How the result should be read

Repeat the same datum three times. Use change over time and symptom correlation rather than a single generic target. Record the fret where the gap was taken.

Read priorities from top to bottom, but stop as soon as new evidence contradicts an earlier assumption. Save or print the result ticket with the entered conditions so another person can reproduce the decision.

Method and logic

The helper converts the entered gap and places it in context with instrument type and buzz location. It preserves the raw measurement rather than calculating a truss-rod turn.

The page keeps calculation and diagnostic claims deliberately bounded. Display rounding improves readability, while the underlying logic uses entered values; descriptive branches report relative tendencies and the evidence needed to confirm them.

Worked example

A recorded 0.20 mm gap converts to about 0.0079 inch. If buzz remains only above fret 15, that number does not justify adding relief; inspect the upper fret and action pattern next.

The example demonstrates reasoning, not a universal setup specification. Substitute real measurements and repeat the final test before accepting the next action.

Assumptions and limitations

Capo pressure, string choice, measurement span, neck profile, temperature, and playing force affect the reading. Relief alone cannot reveal a twist, loose fret, or safe adjustment direction.

Instrument design, service history, measurement error, and player technique can outweigh a calculator or checklist. Where manufacturer instructions exist for the exact hardware, use those instructions and record the revision consulted.

Safety and stop conditions

Stop for abnormal resistance, cracking, heat, odor, electrical sensation, moving wood or joints, a measurement that cannot be repeated, or any step that would remove material without a confirmed cause. Secure strings and stored mechanical energy before hardware work. Refer structural, fret-cutting, mains-powered, or uncertain repairs to a qualified technician.

Related workflow

String Gauge Change Planner — Compare old and new gauges, scale, and tuning before a setup change.
Alternate Tuning String Selector — Estimate a practical gauge direction for a tuning change without inventing brand tension data.
String Action Converter — Convert string height between millimetres and common inch fractions.

Open the related page that answers the next unresolved question; do not run every tool as if every system needs adjustment.