Violin Maker's Corner
Fiddler Magazine|Fall 2022
Fundamental Friction Facts for Fiddler Folks
R. J. Storm
Violin Maker's Corner

Greg V. sent over a nifty communication asking: "Could you discuss the topic of slipping and sticking tuning pegs? When should peg hole bushings be considered? What is involved in doing this?" All good questions, so let us begin.

Classical violin pegs are simple affairs that are essentially a tapered shaft fit into a matched tapered hole. Pressing the peg into the taper should tighten things up, while a peg backing out will loosen. Easy to understand this. An absolute foundation to this simple arrangement working properly assumes a proper fit and mutual concentricity of the peg and the peg hole. The matching taper needs to have as much matched surface area as possible. Slight aberrations can occur, but wood has a certain "plastic deformation" to it and will squeeze and bend, and thus adapt to anything in the ballpark of acceptable work. When you examine a well-fit peg, it is easy to notice the tell-tale double rings that are shiny on the peg shaft. But wait, there's more. Much more. Rotation of wood on wood works so much better with a light layer of compound between the mating surfaces. Pegs need to rotate smoothly around every degree...not just a few. For this reason we can begin by diagnosing the problem in large brushstrokes.

Pegs are usually divided into: too loose or too tight. Two essential ingredients can be used, usually mixed to the "just right proportion" where the peg has the correct gripping power and does not back out or tune down, along with a smooth rotation in all 360 degrees. Ivory soap acts as a wonderful lubricant. If you have dry, sticky, squeaky, creaky pegs, just remove the peg and run the shaft on the corner of the soap, making a small line down the shaft. A little goes a long way and it may need a few lines, but go one line at a time, insert, and twist a few rounds. On the other hand, you may have slipping and loose pegs...from too much soap.

This story is from the Fall 2022 edition of Fiddler Magazine.

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This story is from the Fall 2022 edition of Fiddler Magazine.

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