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Letter 11025
Ra Values and
Description
I AM LOOKING FOR SOME GUIDE RELATING Ra VALUES TO DESCRIPTIONS
LIKE MIRROR FINISH, SATIN FINISH ETC.
Samuel Tai
- Singapore
You are probably aware of the fact that the lower the Ra or RMS
number, the finer the surface finish profile. Now, these number do
not and can not relate to texture, such as a satin finish etc,
because you are talking about a reflective or optical quality of a
surface. I other words, you can have a relatively bright appearance
on a part with a 120 Ra or lower and I can also achieve a satin
finish on these same Ra values. These are 2 different unrelated
standards of measurement.
Hello Samuel!
You really want to take advantage of the information that the
Nickel Development Institute has published on this. Go to
http://www.euro-inox.org/e/material/arch/Cochrane_e.pdf and enjoy the
informative article.
Good luck!
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Lee Gearhart
metallurgist
East Aurora, NY
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Dear Reader, please --
- Post a
question on a different subject.
-
- Answer or follow-up on this subject (in non-commercial
fashion).
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