key leveling -- crown?

[Dale Probst]

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Carl,
You could measure speaking length with a rubber yardstick if you
stretched it the same amount on each string. It might take a while to
get the feel but you could do it. Same with dip, just takes practice
which will yield pretty accurate results. Your method would probably
work but I haven't tried it.
As to the glides, I don't change them because it will affect the
leveling. You have a good point about the wear factor but it has not
caused me a problem yet. I still have to do some fine leveling in the
piano. By the way, Harbor Freight sells a small folding stool on wheels
that puts me about the right height for key leveling and damper work on
grands. Makes life a little easier.
Best,
Dale
-----Original Message-----
From: owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org] On Behalf
Of Carl Meyer
Sent: Monday, November 19, 2001 9:37 PM
To: pianotech@ptg.org
Subject: Re: key leveling -- crown?


Dale,
Thanks for that procedure.  Seems like a good one.  I do think that I
would be concerned using dip as a measurement.  I'd feel like I was
measuring speaking length with a rubber yardstick. The compression of
the felt would concern me.
 
How do you like this?  Suppose instead of setting dip you measure the
distance from the top of the key (natural) to the key bed and then the
top of the key frame to the key bed.  You could use any type of depth
gauge like a dial caliper or just a good rule.
This would be related to dip but would be more accurate and the key
height would refer to the back rail of the key frame and the balance
rail position  and the frame height would check the front rail.
 
I still think that after the glide bolts have been set in the piano,
they should be backed out a set amount (like 1/2 turn) to prevent an
error due to wear of the glide dowels.  They then can be accurately
reset before reinstalling the action.
 
Regards
 
Carl Meyer  Assoc. PTG
Santa Clara, California
cmpiano@home.com  
 

----- Original Message ----- 
From: Dale Probst <mailto:wardprobst@cst.net>  
To: pianotech@ptg.org 
Sent: Sunday, November 18, 2001 12:07 PM
Subject: RE: key leveling -- crown?

Carl & Terry,
Bed the keyframe, adjust the glides and set samples of dip in the piano
before you bring the keyboard into the shop. Then when you clamp the
keyframe to your bench, use shims to duplicate the dip on your samples.
Don't adjust the glides in the shop. When you take the keyboard back you
should be pretty accurate in the piano and just have touchup to do.
Best,
Dale
Dale Probst, RPT
Ward & Probst, Inc.
email: wardprobst@cst.net
(940)691-3682 voice
(940) 691-6843 fax





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