sharp key height

[Newton Hunt]

Key dip is measured at the upper outer edge of the natural key wood. 
The dip block should be measured at each corner and sanded so both
corners match within 0.001".  Whatever that measurement is should be
printed on the key with a felt pen.  One should have several dip blocks
of many thicknesses.  The anvil of the micrometer should be flat to the
bottom of the block.

I don't think I have seen an action that regulated well at .375".  Seems
I am always taking some out, usually .010".  

Know your blocks, know your regulation.  

If .393" (10 mm) is too deep then put in .010" or .012".  Always do what
the action says, not what I say.  Feel good is the watch word of the
action. :)

		Newton, dipped out

Delwin D Fandrich wrote:
> 
> ----- Original Message -----
> From: "Newton Hunt" <nhunt@optonline.net>
> To: <caut@ptg.org>
> Sent: October 25, 2001 4:39 PM
> Subject: Re: sharp key height
> 
> > >  Sharps when fully depressed
> > > should not only take the action through let off and aftertouch but
> > > should stand at .075 above the naturals.  Will that work?
> >
> > The reason 12 mm is the standard is because 10 mm is the standard dip.
> > This is true for most pianos except those that have geometry problems or
> > improperly bored hammers.
> >
> 
> Or the several hundreds of thousands of pianos whose actions were set up for
> a key travel of 0.375" (or 9.5 mm).
> 
> That was back before piano makers discovered the granite quarry and decided
> to make their hammers a bit more dense (i.e., heavy) than anything they
> could achieve with wool felt and then discovered they needed the additional
> leverage (i.e., mechanical advantage) to make it possible for the average
> human to still depress the keys.
> 
> Del