Regulating With Metrics

[paul bruesch]

I think it would be the Chickering Litre Grand.
anonanon

On Feb 5, 2008 8:48 AM,  <mccleskey112 at bellsouth.net> wrote:
>
>
> Just think, no more Chickering Quarter grand. Now it would be 6mm or .25
> Chickering grand.
> Gerald McC
>
> ----- Original Message -----
> From: Dean May
>
> To: 'Pianotech List'
> Sent: Tuesday, February 05, 2008 8:07 AM
> Subject: RE: Regulating With Metrics
>
>
>
>
>
> A hearty amen. When going through engineering school we primarily used
> metrics and even when I worked in design in industry.  It sure did make the
> calculations easier.
>
>
>
> Here's a rough chart for you:
>
>
>
> 1" = 25 mm (25.4)
>
> 3/4 = 19 (19.1)
>
> 1/2 = 13 (12.7)
>
> 1/4 = 6 (6.35)
>
> 1/8 = 3 (3.175)
>
> 1/16 = about 1.5 (1.6)
>
> 1/32 = about 1 (.8)
>
>
>
>
> Dean
>
> Dean May             cell 812.239.3359
>
> PianoRebuilders.com   812.235.5272
>
> Terre Haute IN  47802
>
>
>
>  ________________________________
>
>
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
> Of Jurgen Goering
> Sent: Monday, February 04, 2008 11:53 PM
> To: pianotech at ptg.org
> Subject: 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