[AT] Now grease in unit

[Larry Goss]

The piece of trivia I remember from the Casting, Welding, and Heat Treatment class at Purdue is "1/8-inch Shrink Rule."  I was in the class the last time it was offered prior to the change in engineering education that occurred a couple of years prior to Sputnik.

Larry


----- Original Message -----
From: Roy Morgan <k1lky at earthlink.net>
Date: Monday, April 6, 2009 8:45
Subject: Re: [AT] Now grease in unit
To: Antique tractor email discussion group <at at lists.antique-tractor.com>

> 
> On Apr 6, 2009, at 2:57 AM, <oldiron62 at gmail.com>  
> <oldiron62 at gmail.com> wrote:
> 
> > ... Now I want to cast some iron ... I
> > would be interested in any INFO that you do not care to share.
> 
> You probably know that cast iron shrinks quite a lot as it 
> cools, so  
> you need to make your pattern just that much bigger if 
> dimensions are  
> important.  They likely still do make steel rulers that are 
> calibrated  
> for this purpose.
> 
> A 12-inch rule for this use is nearly a quarter inch longer than 
> 12  
> inches.  This can certainly throw you off if you grab one 
> unawares and  
> use it for normal measuring.
> 
> Roy
> 
> 
> Roy Morgan
> k1lky at earthlink.net
> 529 Cobb St.
> Groton NY, 13073
> 
> 
> 
> 
> 
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