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Joined: Feb 2017
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Well yes, it is involved and requires precise measuring, etc. When doing this permanently we actually add lead to the hammers that need increase, and carve/taper/cove/etc those that need lightening. (Best done with the proper equipment, but wow...what a difference it can make)

But...there's a little trick you can do (just to demonstrate, mind you). Office supply stores sell little binder clips to hold papers. The smallest size available (15mm) is perfect to clip onto the hammershank (right up next to the hammer) and adds about 1g to its strike weight (you must squeeze and remove the wire wingy-thingy handles (otherwise they will interfere...trust me). So you could try this on that first tenor hammer and see/hear what it does (bear in mind though that this will also change your touchweight by about 5g or so [5:1 ratio]). I would show a pic but I have not been successful at that here. Perhaps someone else has one or can post one. (To remove the thing you need to carefully reinstall the wire wingy-thingy handles so as to release it from the shank. You might want to remove the shank/flange assembly first to avoid damage to pinning, etc).

David Stanwood is credited with this little innovation. He dreamed it up back when he was first developing his New Touchweight Metrology many years ago. We use it to demonstrate to the client the effect of strike weight on tone. It is somewhat variable by the position it is placed in on the shank...more effect closer to hammer and vice versa).

Just be careful. I know you will.

Pwg


Peter W. Grey, RPT
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I've used vinyl tubing to add mass. Find the appropriate diameter, cut off what you need then slice down the middle and it becomes self clamping. Mine fit nicely on the shank.


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BDB, your experiment will still result in no change to the periodicity of the strings and thus the realtionship between the hammer mass and periodicity will remain the same. Changing string mass will change the impedance relation between sound/bridge and srings.

Only changing the hammer mass/inertia will modify this relationship because one still wants the note in question to be at the designated pitch.


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Originally Posted by Ed McMorrow, RPT
BDB, your experiment will still result in no change to the periodicity of the strings and thus the realtionship between the hammer mass and periodicity will remain the same. Changing string mass will change the impedance relation between sound/bridge and srings.

Only changing the hammer mass/inertia will modify this relationship because one still wants the note in question to be at the designated pitch.


For those of you who are trying to make sense of the words that are bandied about here: "Periodicity" is frequency. Of course if you change the string, you are going to have to tune it, at which time the period will be the same as before. (Well, not exactly the same, because the motion of the string is not exactly periodic.) "Impedance" here means nothing. You might as well say that changing the mass of the hammer changes the impedance of the relationship between the hammer and the string.

There is an easier way to see how much the mass of the hammer affects the sound. In an upright piano, the bass hammers are shorter, so the mass is less than the tenor hammer at the bass break. In a grand piano, the bass hammers are longer, so the relationship is reversed. If there were that great a difference from small changes in mass, that would show up, even in pianos that have overwound strings on both sides of the bass break.


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