[pianotech] Best way to change touch on Yamaha Grand

[V T]

Hi Joseph,

Here are a few ways to do it, in no particular order:

- Move the key stick fulcrum point on the center rail. You can accomplish that by putting a shim near the pin (in front or behind, depending on where the ratio needs to move). This method is very effective in its ability to shift the ratio. You may want to study how the hole in the key will move relative to the pin and new fulcrum point. Most people who use this method don't report any problems.

- Move the capstan/heel contact point. This is more work and you have to make sure that you have enough room on the wippen heel to make good contact. Some people angle the capstan so they can make use of the last bit of felt on the heel.

- Move the knuckle on the shank. Very effective if you can still regulate the action after you do this modification. I would study the regulation very carefully before committing to this.

If you change the fulcrum point or the capstan position, there will be slight difference in what the modification will do to the sharp keys vs. the naturals. It's good to at least think about that before moving either.

I wonder if you can explain the second question, I am not sure I understand it well enough to answer.

Vladan

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"Pardon a very simplistic question, but do you mean that "action ratio
reduction" is accomplished by movement of the fulcrum point of a given lever
in question, right?
Another question: At what percentage point "improvement" do we start to see
reduced sliding friction benefits?

Joseph Alkana"