RPM or Rev/Min?
RPM or Rev/Min?
(OP)
Which is preferred on a plot of something against engine speed? Are they interchangeable? Is it simply preference? Or is there good argument for one over the other?
- Steve
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RE: RPM or Rev/Min?
David
RE: RPM or Rev/Min?
The designations "revolutions per minute" (r/min) and "revolutions per second" (r/s) are widely used for rotational frequency in specifications on rotational machinery. (See IEC 27-1.)
RE: RPM or Rev/Min?
If you have any potential language/culture barriers then CoryPads suggestion may have more merit. You could always have a foot note explaining it.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: RPM or Rev/Min?
My audience is truly international, but we impose (US) English on them.
The question arose because during an overhaul of some software I'm responsible for, the US reviewer asked me to change all "rev/min" labels to "RPM".
- Steve
RE: RPM or Rev/Min?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: RPM or Rev/Min?
M
--
Dr Michael F Platten
RE: RPM or Rev/Min?
It is one of those things like the 3 on an analog watch - you see it every day but don't really remember what it says.
RE: RPM or Rev/Min?
- Steve
RE: RPM or Rev/Min?
It says 1/min, which is accepted within SI, so that it needn't be translated for every language in the world.
RE: RPM or Rev/Min?
I do often see tr/min and U/min in my work though.
- Steve
RE: RPM or Rev/Min?
Benta.
RE: RPM or Rev/Min?
Rafiq Bulsara
http://www.srengineersct.com
RE: RPM or Rev/Min?
I realize that revolutions are not real units of measure, but neither are radians, or degrees for that matter. I would take RPM over that, any time.
RE: RPM or Rev/Min?
RE: RPM or Rev/Min?
David
RE: RPM or Rev/Min?
RE: RPM or Rev/Min?
Benta,
tr/min = turns/min?
RE: RPM or Rev/Min?
- Steve
RE: RPM or Rev/Min?
..."Rev/min" could easily apply to Microsoft and their revision history.
Thank you -- my best loll in a long while. The second l stands for "loudly."
...or it could be revisions/min in the kingdom of design engineering. Or as I like to refer to these so-called revisions as, "revelations."
cheers
RE: RPM or Rev/Min?
RE: RPM or Rev/Min?
RE: RPM or Rev/Min?
In North America and South Asia, r/min user would have more explaining to do than rpm.
Rafiq Bulsara
http://www.srengineersct.com
RE: RPM or Rev/Min?
I have to take issue with that. These are all "real", they all have a perfectly logical definition. However, only radians are dimensionless, which you will find out very quickly if you are solving equations using angles. (Yep, just finished finals, and yep, had to be careful with that one.) Of course, I hate it when a pre-derived formula calls for an angle and only gives the correct value when you input degrees without explicitly telling you to do so.
For this same reason, the 1/rev placard on my tachometer drives me nuts. Its not that I don't know what they're implying, it that what they're implying is not what they're actually saying.
RE: RPM or Rev/Min?
rmw
RE: RPM or Rev/Min?
RE: RPM or Rev/Min?
RE: RPM or Rev/Min?
rmw
RE: RPM or Rev/Min?
I thought it was miles-pen-hour because that is how the instructor pronounced it at least 70 times during a class in driving a 1-1/2 ton ruck for the army in basic training.
Permit me to digress? A once upon a time co-worker used to complain that his mother would insist that he wash his hands with hot soap and water. (Surely?) she must have said, "hot soapy water." Some quirk of the mind made me think of this from reading Busa's plural minutes comment.
RE: RPM or Rev/Min?
Or to very precies it should be multipled by 6.28 and read radians/second?
Or, the plot should read hz/2*pi /sec?
Personally, rpm on a plot, and rev/min in a computation would work for me.
RE: RPM or Rev/Min?
Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion
&
RE: RPM or Rev/Min?
Rod
RE: RPM or Rev/Min?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: RPM or Rev/Min?
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: RPM or Rev/Min?
Somewhere in the dim past, I was taught that it was courteous to write out in full, capitalized, the first use of an acronym.
The correct initialization or acronym treatment of Revolutions Per Minute is RPM. It may be abbreviated as rpm, and SI is SI.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: RPM or Rev/Min?
A few years ago a new magazine about PDA's was published. I bought a copy to learn but to no avail because they used abbreviations and/or acronyms galore without writng out in full the descriptive words symbolised by the letters after each first use of these "modern" symbolisms. It was pretty much unintelligible for anyone not on the cutting edge of Personal Digital Assistant devices.
An acronym is an abbreviation but an abbreviation is not always an acronym. For example, RPM is not an acronym.
ac•ro•nym [ak-ruh-nim] Show IPA
–noun
1.
a word formed from the initial letters or groups of letters of words in a set phrase or series of words, as Wac from Women's Army Corps, OPEC from Organization of Petroleum Exporting Countries, or loran from long-range navigation.
2.
an acrostic.
a•cros•tic [uh-kraw-stik, uh-kros-tik] Show IPA
–noun
1.
a series of lines or verses in which the first, last, or other particular letters when taken in order spell out a word, phrase, etc.
RE: RPM or Rev/Min?
- Steve
RE: RPM or Rev/Min?
Cheers,
gr2vessels
RE: RPM or Rev/Min?