[TheForge] coefficient of expansion

Mon Aug 11 12:09:00 2003

Mike,

Do you have a reference on the NIST study (professional interest)?

Thanks,
Dan

> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Mike Linn
> Sent: Sunday, August 10, 2003 11:54 PM
> To: [email protected]
> Subject: Re: [TheForge] coefficient of expansion
>
>
> 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.
>
>
>
> _______________________________________________
> http://mailman.qth.net/mailman/listinfo/theforge
> theforge mail list group photo site is
> http://www.photoaccess.com
> Login:  [email protected]
> password:  anvil
> ___________
>
>
>