[TheForge] coefficient of expansion

[Mike Linn]

The CTE of steel varies tremendously based on its composition.
It runs anywhere from 6.3e-6 for hardened tool steels to 11.6e-6 for low 
carbon steels.

NIST ran a study on their gage blocks to determine the CTE,  turns out it 
varies as much as 10%
even between blocks of the same manufacturer and supposed same steel.

When I calibrate gage blocks or am performing measurements where I need to 
compensate for a delta-T,
I assume 6.5 uin/in/deg F  +/- 0.65 uin/in/deg F (as defined by empirical 
data from Mitutoyo)

With out actually measuring the CTE with a dilatometer (new word for you) 
its just a SWAG anyway..

mike

At 09:25 PM 8/10/2003 -0600, you wrote:
>Just looked in another book they gave these numbers
>Farenheit 6.7x10^-6
>Centigrade 12x10^-6
>Bet Mike was talking centigrade.
>Randy Mundt


            Mike Linn
      Artist Blacksmith
          McCalla, AL
        AFC Webmaster
http://afc.abana-chapter.net

Some people are like Slinkies...not really good for
anything, but you still can't help but smile when you
see one tumble down the stairs.