Regulating With Metrics

[Delwin D Fandrich]

One of the first engineers I worked with at Baldwin, lo these many years ago,
pointed out that (with the exception of things like wire diameters and centerpin
diameters) there is very little in the piano that needs to be more accurate than
the width of a pencil lead. Typically that is between 0.5 and 0.9 mm. Nothing I
have seen since has caused me doubt the wisdom of that advice.
 
Del
Delwin D Fandrich
Piano Design & Manufacturing Consultant
620 South Tower Avenue
Centralia, Washington 98531  USA
Phone  360.736-7563
<mailto:fandrich at pianobuilders.com> 


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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of
Jurgen Goering
Sent: February 05, 2008 9:56 AM
To: pianotech at ptg.org
Subject: Re: Regulating With Metrics


I can see someone relating to their shoe being a foot long, but this I truly
cannot understand. One hundredth of a mm, the standard unit on metric
micrometers, is equal to 2.5 thousandths of an inch. Surely you can measure
small distinctions with that.

The downfall when trying to use both systems is where they meet. Lets say you
have a dip of 10 mm and you find it is a bit too shallow. You want to add .008".
How many mm is that now? ( I know, I did the math - it is 10.2 mm, but why deal
with conversion?) It is conversion that screws you up and makes it unwieldy and
clumsy.
Jurgen Goering


On Feb 5, 2008, at 9:09, Alan Eder wrote:


We have long used metric exclusively for regulating in our shop.  However, the
thousandth of an inch is still very handy for really small measurements and
distinctions, so we refuse to part with it!

Alan Eder

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