Curated with aloha by
Ted Mooney, P.E. RET
The authoritative public forum
for Metal Finishing 1989-2025
-----
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
(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)
Q, A, or Comment on THIS thread -or- Start a NEW Thread
Q, A, or Comment on THIS thread -or- Start a NEW Thread