blow discrepancy:technique?

[Joe & Penny Goss]

Dave ,
It is just easier to read the ruler from the back of the hammer molding.
Joe Goss
----- Original Message ----- 
From: David Renaud <studiorenaud@qc.aibn.com>
To: <pianotech@ptg.org>
Sent: Monday, February 21, 2000 6:03 AM
Subject: blow discrepancy:technique?


> I have always measured a straight line from hammer tip to string.
> 
> But:
> A colleague insists the best way to determine travel in an upright
> is to push a hammer molding forward to the stings
> with a ruler, mesuring from the back edges of the respective
> hammer moldings.
> 
> I find that this method always produces a slightly reduced
> reading. On my action model a 1/16th reduced reading.
> This is apparently due to the hammer always traveling
> from an angled position to a perpendicular position relative to
> to strings. It will always reach slightly forward as it assumes a
> perpendicular position and block premature of its straight
> line measurement. So he could be right.
> 
> But:
> The hammer is traveling though an arc. So it is greater
> then any straight line measure anyway. So I still I'm still right.
> 
> Never thought much on this before. Was always concerned
> more with relationships working between travel distance
> and key travel for correct aftertouch then travel being 1 7/8.
> The test seems to support this as it gives +/- 1/8 to make it
> work. Never less in a test siduation 1/16+ difference due
> to measuring technique is too much.
> 
> So is my hammer to string, straight line technique
> from the front of the hammer wrong?
> Or is is better to approach these measurements from the
> rear measuring molding to molding with the hammer engaged?
> 
>                                                      Cheers
>                                                      Dave Renaud
> 
> 
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