MUIC & ACOUTIC – INTRUMENT BUILDING & LUTHERIE CALCULATOR Refret Radius Match A precise tool.
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What is the Refret Radius Match & How does it work?

The fret crown radius is a crucial aspect of guitar design, affecting the playability and tone of the instrument. It refers to the curvature of the frets themselves.

A well-matched refret fret crown radius to fretboard radius ensures optimal string height and action, which are essential for a comfortable playing experience. This relationship can be quantified using specific formulas that consider the geometry of both the frets and the fretboard.

R_{text{fret}} = frac{R_{text{board}}}{1 + sqrt{1 – left(frac{h}{R_{text{board}}}right)^2}}
R_{text{fret}} = fret crown radius, R_{text{board}} = fretboard radius, h = string height above the fretboard
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Frequently Asked Questions
What is the importance of matching fret crown radius to fretboard radius?
Matching the fret crown radius to the fretboard radius ensures optimal string height and action, leading to a more comfortable playing experience.
How does the formula for refret radius match work?
The formula R_fret = R_board / (1 + sqrt(…)) quantifies the relationship between the fret crown radius and the fretboard radius, considering their geometric properties.
Can I use this calculator for any type of guitar?
Yes, this calculator can be used for various types of guitars, including acoustic, electric, and classical guitars, to ensure proper refretting.
What are the benefits of having a well-matched fret crown radius?
A well-matched fret crown radius improves playability by ensuring even string height across the neck, resulting in better tone and easier playing.
How do I measure the fretboard radius for this calculator?
To measure the fretboard radius, you can use a large diameter ball or a specialized tool called a radius gauge. Place it on the fretboard at the desired measurement point and read the radius.
What should I do if my guitar’s frets are worn out?
If your guitar’s frets are worn out, you may need to have them refretted by a professional luthier. This process involves removing the old frets and installing new ones with the correct radius.
Can this calculator help me avoid buzzing strings after refretting?
Yes, by ensuring that the fret crown radius matches the fretboard radius, you can minimize buzzing strings and achieve a smoother playing experience.

Results are for informational purposes only and do not constitute professional advice.