Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Old European roughness parameter Rz

May 9, 2011

We are updating an old design which calls for an Rz of 100. The 100 is under the surface roughness symbol proceeded by the letters Rz. I found the definition of Rz but cannot find the units of the number 100. This is a large number for microns.
In another case on the same design the surface roughness symbol has R 25 under the symbol. I cannot find the meaning of "R" or the units of the number.
Please provide information as to the units of the numbers and the meaning of "R".

57141

Frank Brummerhop
Engineer - Baton Rouge, Louisiana, USA

(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

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: