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The router bit maintenance is usually ignored. Whenever picking up a bit, it is filled with dust, gum, and pitch. John Cameron showed us his maintenance method. Combining his teaching and our experience, here is what we are currently doing to keep the bits sharp as long as possible.
The procedure is guided by shop owner Mr. Jude Reveley. Tool sharpening and use of hand force on chisels is taught by Mr. John Cameron. This is my second practice in the 8 years of working at Absolute Piano Restoration and the third in my entire life. Hopefully the next one could be a little better. My deep gratitude for these two dedicated masters. According to Renner USA, the balancier center pin friction is between 6 and 8 grams. On this new set of wippens, the friction is about 1 to 2 grams. Re-pinning is needed. During the procedure, the rep-spring will be in the way, a small hook can be made out of piano wire or a paper clip to pull the spring out of the way.
Often times, the center pin bushing cloth is treated with a certain chemical from manufacturer which may cause increased centerpin-bushing friction through time and usage. Re-pinning helps prevent this problem. |
