Hi Ed, With regards to hammer mass re tone and touch there are several observations that I have encountered over the last 5 or 6 years. 1. With the rising cost of Walnut there has been a shift by the manufacturers to use materials like Birch and Maple for hammer moldings with the resulting increase in mass. All too often the touch weight has not been corrected. Therefore triming down the sides of the hammers can make a great improvement to the touch of the instrument. 2. I have wondered about the Korean pianos that I have encountered with parallel moldings and down touch weights as high as 70gms if the maker is just saving money by cutting out one operation. Removing mass from these instruments has a great effect on touch weight and impact 'noise' . In the treble section a noticeable reduction in V bar noise is also apparent, plus a longer singing duration of the note. 3. We have to be careful about the model and make of instrument that we are talking about, Manufacturers with proven models and quality control systems seem less of a problem in this area. The lower quality makers invariably have other problems that that have to be corrected before proceding with the half a days work involved with tapering a set of installed hammers. However the results are well worth the labour when accompanied by a good regulation and voicing. It can make a budget range piano sound and feel very respectable. 4. Pianos that I have treated in this manner have convinced me that voicing stability is improved , possibly due to less compaction to the face of the hammer, but this is gut feel and not a scientific observation. 5. I can agree with the comment that we do not know the ideal dwell time of the hammer on the string, and what is the ideal amount of whiplash in the shank for the treble hammers?? 6. The lighter hammer should also reduce the amount of metal fatigue that takes place every time the string is struck, therefore the instrument should maintain its singing quality for a longer time. 7. Question. will a high mass hammer increase V bar wear? Finally the more I think about the original question, the more questions come to light. Roger Jolly University of Saskatchewan Dept. of Music.
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