leverage and touchweight

[Newton Hunt]

Hi Doug,

What a wonderful devise you have come up with.  Having that information can be quite
useful.  With what you have described you might also be able to determine the amount
of gram force required to depress a key to just before let-off begins and also how
much the key will lift from the beginning of let-off to near rest position of the
key.  How far down a key goes and tghe amount of after touch is veryh important btu
for action analysis the up and down weight, the averge and half the difference are
esential analysis information for us.

We spend a lot of time taking these measurements and  a few others as well.

I think you have done a magnificent job without any guidance from those of us who are
in the field and I am impressed.

There are those who are true gurus of this aspect of piano work and I especially
recommend you speak with David Stanwood <Stanwood@tiac.net> who can help you develop
your ideas even further.

Very well done indeed.

		Newton Hunt
		New Jersey

doug condit wrote:
> 
> To the list,
> I am a high school student who had made a computer automated device which
> measures the Active touch depth (key dip minus aftertouch)of all 88 keys of
> a piano action in less than an hour, and calculates the leverage from this.
> The device takes 3 samples of each key.  If there is a deviation of more
> than .001" it takes three more samples and averages the numbers. It also
> takes the touchweigh of the action. This information is collected and
> graphed so the information is very accessible and easily saved so a record
> can be kept on the history of each piano tested and worked on. I am
> competing at International Science and Engineering Fair in San Jose
> california next week and I need feedback from professionals in this field on
> the importance of these measurements and how useful this type of device
> would be to technicians who rebuild and or regulate actions.   I would
> appreciate any responses, as this is important to my project.  Thank your
> for your time.
> 
> Respectfully,
> Doug Condit
> _________________________________________________________________
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