[pianotech] Hammer strike line. Was-----whatever

[Ron Nossaman]

David Love wrote:
> One interesting thing that I'm beginning to notice is that there is an
> interaction between grain angle, assembly stiffness and hammer tolerance.
> For example, I've built boards of varying stiffness in terms of rib scales
> altering the grain angle (from 50 to 60 degrees--bass cutoffs are standard)
> and have noticed that the boards with higher grain angles seem to be less
> hammer tolerant no matter what the stiffness factor in the ribs.  That's
> interesting to me, if true.  

It is indeed.


>My current formulas have backed off on the grain angle
> changes somewhat (though they are still increased from an often seen 45
> degrees but not as much as 60 degrees on anything under 7') and kept the rib
> scales still in the light-mid to midrange for low tension scales like
> Steinway.  While that hasn't put me in the realm of Premium Blue or stock
> Abel hammers it has allowed me to prepare hammers with a somewhat more
> aggressive attack without any problems.  

Interesting. I've done something similar with stiffer rib 
scales, even with high grain angles. Hmmmm, more factors.

Thanks. This appears to be explorable evidence.
Ron N