<br><font size=2 face="sans-serif">I like using metric as well, but I beleive
that US makers in the 20's( and before and after. in the 70's who
knows?!?! <G>) used standard measurements, don't you think? Metric
is easier to work with. IMHO.</font>
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<br><font size=2 face="sans-serif">PW</font>
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<td width=40%><font size=1 face="sans-serif"><b>Jurgen Goering <pianoforte@pianofortesupply.com></b>
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<br><font size=1 face="sans-serif">Sent by: pianotech-bounces@ptg.org</font>
<p><font size=1 face="sans-serif">02/04/2008 11:14 PM</font>
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<div align=center><font size=1 face="sans-serif">Please respond to<br>
Pianotech List <pianotech@ptg.org></font></div></table>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">pianotech@ptg.org</font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: Regulating Without Specs</font></table>
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<br><tt><font size=2>At the risk of opening a large can of worms and an
even larger debate, <br>
I think this is perfect example of why going metric (like Dale Erwin <br>
demonstrated) is such an elegant mode of transport through exercises <br>
such as these. Mixing fractions with decimal inches may work in
this <br>
prepped example, but the numbers are hardly ever so fortuitous.
I <br>
heartily suggest to all technicians to immerse themselves in <br>
millimeters, stop converting to inches, buy metric rulers, calipers and
<br>
whatever other measuring tools they need and discover the brilliant <br>
ease of working in that system.<br>
ducking for cover...<br>
Jurgen Goering<br>
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On Feb 4, 2008, at 19:20, pianotech-request@ptg.org wrote:<br>
> snip...<br>
> Let’s just say you want something typical like a 3/8” key dip, 1/8”
<br>
> letoff, and .050” aftertouch. (Later I’ll show the equations
for <br>
> solving for different variables) Given the 3/8”
key dip (.375”) and <br>
> the .050” aftertouch, we subtract aftertouch from key dip and know
<br>
> then that we have .325” of useable key dip to move the hammer.
How <br>
> far will it move? It will move 5xs the amount of keydip.
5 x .325” = <br>
> 1.625”. But that’s not the hammer blow distance, because we
haven’t <br>
> accounted for letoff. If we want 1/8” (.125”) letoff, we need
to ADD <br>
> that to the hammer travel of 1.625”, so the blow distance is then
<br>
> 1.75”, or 1 ¾”.<br>
> ...snip...<br>
> OK, Lemme know whatcha think!<br>
> <br>
> John Dorr, RPT </font></tt>
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