finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
topic 28632

RHR SURFACE TEXTURE CALL OUT


(2004)

We have an have an old part print that calls out for a 100 RHR surface finish on a 4340 after Heat Treat piece of steel to be metal cut to.

01) What does RHR stand for?

02) What does 100 RHR mean?

03) What is the equivalent of 100 RHR to micro-finish in a Ra call out?

Andy Bemak
Aerospace Engineering - Cleveland, Ohio


(2004)

RHR = Roughness height reading

An older means of specifying a range for Ra is RHR. This is a symbol on a drawing specifying a minimum and maximum value for Ra.

Max 20
RHR RHR
Min 10

Older drawings may have used this notation to express an allowable range for Ra. This notation is now obsolete. For example, the second symbol above means that Ra may fall between 10 micro in and 20 micro in.

Niranjan S Kulkarni
- India



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView CURRENT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2018 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.