More dip in bass

[baoli liu]

The let-off has a 1.5 mm(about one sixteenth of an
inch) difference between bass and treble,this is a
good compensation for the difference between key
ratios.

For most pianos,the manufacture recommend bigger
let-off on bass section(3mm is recommended by Germany
steinway) and smaller treble let-off(1.5mm recommend
by Germany Steinway).

The 1.5 mm difference could compensate the key ratio
by 0.15(assuming that the key dip is 10 mm).This SD-10
action has only a 0.02(0.54 minus 0.52) difference,I
don't think you have to change the key dip if you want
to keep the blowing distance the same and the let-off
tapered.

Of course,if you prefer to spent a little more time to
taper the dip,it could turns out to be "better",but I
don't think the "improvement" will be very noticeable.

Just my opinion.

Baoli Liu


> 
> ----- Original Message -----
> From: "Phillip Ford" <fordpiano@earthlink.net>
> To: "pianotech" <pianotech@ptg.org>
> Sent: August 14, 2002 9:47 AM
> Subject: More dip in bass
> 
> 
> 
> 
> The topic of a graduated keydip from bottom to top,
> or more keydip in the
> bass, came up in a discussion that I had with David
> Love about the action
> from
> a Baldwin SD-10 that I'm rebuilding.  This action
> has an angled balance rail
> and an angled capstan line (in other words not
> parallel to the front of the
> keys or the keyslip), like a Steinway D action.  The
> key ratios vary a bit
> from the bottom end to the top end of the keyboard. 
> The keys at the bottom
> end have a key ratio of .52 and those at the top end
> have a key ratio of
> .54.
> The action is Renner and of good quality.  I don't
> know if this change in
> ratio was deliberate or accidental.  The result of
> this is, unless I change
> the capstan locations, that the blow distance or the
> keydip must be
> graduated
> from one end of the keyboard to the other for all
> the notes to have the same
> aftertouch.
> 
> Have any of you seen other actions with a graduated
> key ratio that you
> thought
> was deliberate?
> 
> My own personal feeling is that more keydip in the
> bass feels natural and I
> often set actions up like this.  Pianists who have
> given feedback have
> seemed
> to like the actions, but I've never done a direct
> A-B comparison between
> uniform keydip and keydip graduated from bottom to
> top to see if they prefer
> the graduated keydip.  Any thoughts about this?  Any
> feedback from pianists
> on
> this?
> 
> Phil Ford
> 
> 
> 
> Phillip Ford
> Piano Service & Restoration
> 1777 Yosemite Ave - 215
> San Francisco, CA  94124
> 
> 
> 
> 


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