Extreme cooling of steel shaft 1

[edison123]

I do not whether this is the right forum. If not, please point it out.

I plan to shrink a 70 mm diameter x 1000 mm long shaft by cooling it with dry-ice (CO2) before fitting it to a 70 mm hole.

Dry-ice is supposed to be at -79 deg C. Assuming I get around -70deg C, what will be the shrinkage of the shaft diameter ? How do I calculate it ?

Thanks in advance.


* I would go green if only I were not yellow *

 

[metengr]

The COE for steel is typically 6.5 X 10^-6 in/in/deg F at ambient temperature.

diameter = COE * delta T * original diameter

 

[edison123]

Thanks metengr.

Could you pls explain how you got two linear dimensions in/in ?

Also, delta T in my case would, asuuming an ambient of 30 deg C and CO2 temperature of - 70 deg C, be 100 deg C ?

* I would go green if only I were not yellow *

 

[edison123]

Ok. Got it. It is expansion in inches per inch of the material per deg F.

* I would go green if only I were not yellow *