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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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30 RA to Microns
How do you convert from English Ra to microns. I need to have impression rollers grinded down to somewhere between 32-63 microns but my American supplier uses Ra. The surface finishes that they provided us ranged from 30-40 Ra. Is there a simple way to convert this? Are they within our metric tolerances?
Thank you!
Plant Shop Employee - St. Louis, Missouri
January 5, 2011
Hi, Jeff.
There are 39.37 inches in a meter, so there are just under 40 microinches in a micron. An Ra of 30-40 microinches would thus be an Ra of about .75 to 1.0 micron. I suspect that your in-house terminology is wrong and that you actually require an Ra of 32 to 63 microinches.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
January , 2011
Q. Can anyone tell me what 150 microns would be in an Ra finish?
Thank you,
Danny
- Gelnwood, Minnesota, USA
January 11, 2012
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