So I've got this metal bar (mild steel) and it's flat and 0.19" thick. Well, it *was* 0.19" until I measured it today and now it's put on an extra 9.5 thou which I can only attribute to the weather. I'm guessing I probably originally measured it at 10C and today it's 20C. But would
10 degrees C really make that much difference? I trimmed it down from 0.2" to make a shim and this extra few thou is really buggering things up.Ta.
Dave Dagenham, UK
Finger trouble. I reckon it should have expanded around 0.02 thou. Assuming 10 degrees and a k of 12.5e-6/deg C
I'm not much good with inches and thou any more, particularly when mixed with degrees C. But:
The coefficient of thermal expansion of steel is around 10^-5 per degree C.
You raised the temperature by 10C, so your shim increased by 10 ^-4 (one-ten-thousandth) of it's original thickness, ie it increased by a fraction of a thou due to the temperature increase.
The original thickness was 190 thou, and that should have increased to
190.2 thou due to the temperature increase.At least, I think that's correct. :)
I knew that was wrong! 190.02, not 190.2.
Same measuring tool, or different? Brian
Same.
Dave,
Dagenham, UK
He may have been asking who made the measurements? ;)
HAHAHAHAHAHAHA!!!
Nice one. ;->
Dave,
Dagenham, UK
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