Understanding the Basics of Piano Hammer Refacing
Refacing piano hammers is a specialized task in piano maintenance that involves reshaping the felt on the hammers to ensure they contact the strings properly, producing a clear, rich sound. This process can also extend the life of the piano hammers and improve the overall sound quality of the instrument.
Identifying When Hammers Need Refacing
Piano hammers typically require refacing when they show signs of wear, such as grooves or a flattened surface where they strike the strings. These imperfections can cause a muddy or uneven tone. Regular players might notice a change in the timbre or decreased dynamic range which often indicates it’s time for hammer maintenance.
Tools and Materials Needed
- Needle-nose pliers
- Sandpaper (fine and medium grit)
- Hammer voicing tool
- Piano hammer voicing block
- Files (round and flat)
- Hammer reshaping press (optional)
- Felt strips (for underlaying if necessary)
- High-quality contact adhesive
Preparation for Refacing
Before starting the refacing process, it is crucial to carefully inspect each hammer. Detach the action from the piano to access the hammers easily. Use a flashlight and magnifying glass to assess the extent of wear and any deep indentations or compacted felt.
Step 1: Removing Old Felt
If the felt on the hammers is too worn or compacted, it may need to be completely replaced. Carefully peel away the old felt using needle-nose pliers, taking care not to damage the wooden core of the hammer.
Step 2: Sanding the Hammer Heads
Using medium grit sandpaper, sand down the wooden cores of the hammers to remove any residual glue or felt pieces. Transition to fine grit sandpaper to smooth the surface. This preparation is essential for the new felt to adhere correctly.
Step 3: Applying New Felt
Measure and cut the new felt strips to size, ensuring they wrap around the hammer head completely without overlapping. Apply a thin layer of high-quality contact adhesive to both the hammer head and the felt. Allow the glue to become tacky before applying the felt, starting from the underside and pressing firmly as you wrap it around the hammer head. Trim any excess felt.
Step 4: Shaping the Hammers
After the adhesive has dried, use the hammer reshaping press to uniformly shape the hammers. If you do not have access to a press, manually shape each hammer using a voicing block and needle-nose pliers for precision.
Step 5: Fine-Tuning and Voicing
Voicing the piano hammers is critical as it adjusts their density to affect how they strike the strings. Use a hammer voicing tool to gently poke the felt, making it softer in areas where less harshness is needed. This step requires a good ear and experience as it involves subtle adjustments.
Step 6: Checking Uniformity
Reattach the action to the piano and check the uniformity of hammer strikes. Play each note, listening for any inconsistencies in tone. This is also a good time to align the hammers if they are hitting multiple strings or if their path to the string needs adjustment.
Maintaining Hammer Shape
Regularly inspect and touch-up the hammers to keep them in good shape. Avoid excessive humidity and temperature swings as they can degrade the felt faster. Use an appropriate piano cover to protect the instrument when not in use.
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By following these detailed steps and maintaining a routine check on their condition, piano hammers can be kept in prime playing condition, thereby enhancing the musical experience and preserving the life of this cherished instrument.
