Calling out Knurling on a drawing
Calling out Knurling on a drawing
(OP)
Ok so I did some research on this and talked to several people, and nobody really seems to know how to do this properly. Does anybody have experience as to how to do this CORRECTLY.
Thanks
Bergey
Thanks
Bergey





RE: Calling out Knurling on a drawing
RE: Calling out Knurling on a drawing
Knurling is specified in terms of type, pitch and diameter before and after knurling. Where control is not required, the diameter after knurling is omitted. Where only a portion of a feature required knurling, axial dimensioning is provided.
ANSI/ASME B94.6 is the inch-knurling standard.
On an actual drawing this translates to a note or call out along the lines of either:
PITCH .8 RAISED DIAMOND KNURL
OR
96 DP RAISED DIAMON KNURL ALL AROUND
The former gives the actual pitch, the second is how many ‘peaks’ around the diameter (DP = diametral pitch per ASME Y14.38-1999).
Only the former is explicitly given in 14.5, I think the latter may be in B94.6, it was about a year ago I looked into it so I can’t recall for sure.
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
If not then it could be different, e.g. if you're in another country.
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
RE: Calling out Knurling on a drawing
I'm actually working at one of the places that (at least historically) dont like to follow the standards. We're gradually changing that but it's not always pain free.
I just referenced the standard as the OP asked for 'CORRECTLY', I figured that, assuming the OP is in the US, the ASME standards are as good a definition of correctly as anything else.
Back in the last place I worked in UK we would often just put a callout saying COURSE KNURL or FINE KNURL but arguably that doesn't well define it.
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
Thanks for the help.
Bergey
RE: Calling out Knurling on a drawing
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
RE: Calling out Knurling on a drawing
While there are differences the ASME & ISO standards are generally getting closer to each other. Y14.5M applies to both metric & inch.
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
RE: Calling out Knurling on a drawing
However, you can get fined for selling food such as potatoes by the pound or material by the yard etc.
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
Don
RE: Calling out Knurling on a drawing
Matt
CAD Engineer/ECN Analyst
Silicon Valley, CA
sw.fcsuper.com
Co-moderator of Solidworks Yahoo! Group
RE: Calling out Knurling on a drawing
Matt
CAD Engineer/ECN Analyst
Silicon Valley, CA
sw.fcsuper.com
Co-moderator of Solidworks Yahoo! Group
RE: Calling out Knurling on a drawing
1) Links electrical and mechanical response
2) Has connection to the periodic table
3) Correctly separates force and mass into 2 entities
is very overrated. I hope we in the USA continue to perpetuate the lunacy of pound-force and pound-mass in perpetuity.
Regards,
Cory
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RE: Calling out Knurling on a drawing
I could really care less whether they change over to Metric or not, since it makes absolutely no difference to me whatever.
And incidentally, the English unit for mass is the slug. Pounds are a unit of force. Using lbm for mass is strictly bush league.
Don
RE: Calling out Knurling on a drawing
I am aware of the mythical slug, as used in USA universities. I have never seen a document in industry use or refer to the slug. What is the conversion between the slug and the international prototype of the kilogram housed at BIPM?
While some segments of society/industry can avoid SI, it is necessary if you are to combine all segments. That is the beauty - I can switch from vehicle dynamics, stress calculations, and electrochemistry without changing unit systems. It really is the only game in town for those that touch multiple areas.
Regards,
Cory
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RE: Calling out Knurling on a drawing
You'd be better off worrying about getting projects done and out the door than fussing about minutiae like the international standard for the kilogram.
Get back to work, kid!
Don
RE: Calling out Knurling on a drawing
Sadly in the UK only metric is taught now. In fact the latest generation of teachers have no knowledge of imperial measurements, so Lord help the students.
However I fear we are drifting rather OT....
"I love deadlines. I love the whooshing noise they make as they go past." Douglas Adams
RE: Calling out Knurling on a drawing
Two seconds may cover the conversion from millimeters to inches, but not everything is so simple. A vehicle crash simulation requires a self-consistent set of units to perform accurately - you can't just convert pounds and inches as you see fit. You can back calculate the kilogram to slug relationship, but only by knowing the Earth's gravitational constant (which is measured and reported in SI).
Try a corrosion or electroplating equation that requires Avogadro's number. There isn't a slug-friendly version of that lying around.
SI wasn't dreamed up as a way to pit the USA against the rest of the world. As a matter of fact, Americans at NIST are among the most influential in furthering SI for the betterment of society.
Based on your reported age, I would say that we are contemporaries rather than separated by a significant age difference.
Regards,
Cory
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RE: Calling out Knurling on a drawing
For complex calculations metric is probably more useful/easier.
I put my hand up and admit that I prefer to do complex calculations in metric as that is what I was taught in at school.
As for mixed units/conversions, I couldnt' help but think of NASA too.
When it comes to straight measurements tough, I guess I'd agree metric is overrated. I'm 5'10", can't remember what that is in metric.
KENAT, probably the least qualified checker you'll ever meet...
RE: Calling out Knurling on a drawing
I'm not trying to say that the world should convert to the English system; I'm saying that I don't give a damn. I can calculate with Avogadro's number or use the acceleration of gravity (32.2 ft/s^2!), or kilowatts, or pascals, etc. perfectly well because, as I mentioned, I'm fluent in both systems.
The snafu at NASA was ostensibly caused by scientists who were not unit-bilingual...you know, like Europeans.
Don