[AT] Farmer's sig line

[charlie hill]

Henry,  I have a friend that builds precision models of wooden ships.  He'd 
argue with you about that 1/16 th inch rule.  He's got parts on his boats 
that are smaller than a 16th.

Charlie
----- Original Message ----- 
From: "Henry Miller" <hank at millerfarm.com>
To: <at at lists.antique-tractor.com>
Sent: Friday, January 26, 2007 9:19 PM
Subject: Re: [AT] Farmer's sig line


> On Friday 26 January 2007 17:19, Francis Robinson wrote:
>> That sig line was generated as part of my ongoing drive to annoy the
>> various woodworkers on several woodworking lists that think that they 
>> must
>> spend an hour on each little setup lining everything up with a
>> micrometer... I speak often of how I consider a hatchet to be a precision
>> woodworking tool.   ;-)    ;-)    I have no problem with them working 
>> that
>> way but several feel the need to tell all of the new guys that they are
>> stupid if they don't do the same things and some even like to make
>> statements that imply that guys who don't shouldn't be allowed to do
>> woodworking. The thing is I know the truth..
>
> You missed one great truth: wood is suitable for precise work.    In 
> normal
> room environments wood will expand and contract greatly.
>
> I too know people who carefully measure wood with a micrometer.    Someday 
> I'm
> going to go back to one of their projects with a micrometer and show them
> just how much it moved, without any noticeable change.
>
> Wood should never be measured to less than 1/16th inch.   Iron is measured 
> to
> 1/1000th of an inch.    If you go for more than this you need to account 
> for
> how your part will change as conditions change.
>
> Even then you need to be careful.  There is a measureable different in the
> length of a 747 between hot an cold days. (in the millimeter range)
> Something Boeing takes into consideration.   (mostly by making things fit
> loose enough that they can move)
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