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Tag Archives: spruce

Repairing an Instrument with a Sound Post Crack

Sound post cracks are very common in the long life of a violin family instrument. When repaired properly with a sound post patch, the instrument can continue to be a reliable tool beyond your lifetime and perhaps even improve its tone. Materials and tools Block plane Sharp knife Wide gouge with tight sweep Sharpened pencil […]

Illustrating the Relationship Between Humidity and Wood

Whether you are a string player or luthier, whether consciously or not, much of your career involves reacting to changes in instruments because of atmospheric fluctuations, particularly those changes in the amount of moisture contained in the air — humidity. This is a theoretical explanation of only a few important physical properties of wood. Furthermore it […]

Raising the Projection

This is a guide to a common adjustment, especially in times when instruments experience higher than average humidity. Excess moisture in the air can cause the spruce top of an instrument to swell, most notably in a transverse direction (perpendicular to the grain). Since the plate is fixed around the edges, it has nowhere to go […]

Making a Soundpost

Why bother making a sound post? Making a sound post for every instrument allows you to constantly be familiar with your tools and your hands, and with each one you are honing your skills for other tasks that demand accuracy. It’s also quality control for your sound post stock. If you buy sound post stock it […]

Conical Through Patch, Edge, and Underlay: C-Bout

This viola came in with some serious damage to the treble c-bout edge due to the bow hitting it. The purpose of the conical patch is to use the existing wood and raising it into a position that is past the damage so that the joint is almost invisible. In this case in particular, there […]