Regulating Without Specs

[Paul T Williams]

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.

PW




Jurgen Goering <pianoforte at pianofortesupply.com> 
Sent by: pianotech-bounces at ptg.org
02/04/2008 11:14 PM
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Re: Regulating Without Specs






At the risk of opening a large can of worms and an even larger debate, 
I think this is perfect example of why going metric (like Dale Erwin 
demonstrated) is such an elegant mode of transport through exercises 
such as these.   Mixing fractions with decimal inches may work in this 
prepped example, but the numbers are hardly ever so fortuitous.   I 
heartily suggest to all technicians to immerse themselves in 
millimeters, stop converting to inches, buy metric rulers, calipers and 
whatever other measuring tools they need and discover the brilliant 
ease of working in that system.
ducking for cover...
Jurgen Goering


On Feb 4, 2008, at 19:20, pianotech-request at ptg.org wrote:
> snip...
> Let’s just say you want something typical like a 3/8” key dip, 1/8” 
> letoff, and .050” aftertouch.  (Later I’ll show the equations for 
> solving for different variables)    Given the 3/8” key dip (.375”) and 
> the .050” aftertouch, we subtract aftertouch from key dip and know 
> then that we have .325” of useable key dip to move the hammer.  How 
> far will it move?  It will move 5xs the amount of keydip.  5 x .325” = 
> 1.625”.  But that’s not the hammer blow distance, because we haven’t 
> accounted for letoff.  If we want 1/8” (.125”) letoff, we need to ADD 
> that to the hammer travel of 1.625”, so the blow distance is then 
> 1.75”, or 1 ¾”.
>  ...snip...
> OK, Lemme know whatcha think!
>  
> John Dorr, RPT 

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