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
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