Vector Comments

[stanwood]

Hi Everyone,

Serge's vector problem has brought up some interesting discussion.

I consider geometry to relate to the efficiency with In my mind, action
action geometry relates to the efficiency of the action mechanism
and the interaction between the lever arcs of the various action components.
Inefficient geometry invariably expresses itself as friction, and friction
expresses itself as a difference between upweight and downweight.

For instance:

The best tip I've gotten from Chris Robinson relates to using touchweight to
determine optimal action spread.  He suggests finding a spread distance that
yeilds the least difference between downweight and upweight.

Or, if there is excessive rubbing at the capstan contact point, it will
express itself as friction and can be traced to an effect on upweight and
downweight.

I find generally that action geometry is not a major problem in piano
actions.  Where I see a vast majority of problems is in the leverage yeild
of the action.  The confusing thing is that the action geometry can be quite
efficient but the leverage off.   We often assume that heavy action is a
geometry problem when in reality the problem is one of leverage requiring
weight and ratio solutions.

Just some thoughts...


David Stanwood