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Calling out Knurling on a drawing 3

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Bergey

Bergey

Nuclear
Jul 17, 2007
4
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
 
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Well I am not sure if this is correct, but my last company had a policy on how to do this. We would draw the shaft at it's base size and place a note with a leader stating what knurl was to be applied. If I were you, I would talk to whoever is going to do the knurl for you, and see how they would like it called out.
 
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ASME Y14.5M-1994 1.8.17 & Fig 1-46 gives the basics:

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...
 
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Just realized, the above assumes you're working to the ASME standards.

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...
 
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I have found many companies here in the US that don't like to and will not follow the ASME standards. They are even QS and TS certified. They prefer to follow their own methods so they get the best results. Well that and many times they are vastly under-educated and don't understand most standars... :)
 
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sbozy, that's why I put e.g. not i.e.

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...
 
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Well actually I'm in Canada, and typically if the part were to be made in house I would just put course, or fine knurl, however we will be outsourcing this, and there is a good chance that the company making it will not be the same as the one who originally made it. I would venture to say that simply putting fine knurl will greatly reduce the chances of getting what we actually want.

Thanks for the help.

Bergey
 
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Afraid I know nothing about Canadian Drawing standards. I'm pretty sure I've seen at least one Canadian poster that uses the ASME specs but what would I know.

KENAT, probably the least qualified checker you'll ever meet...
 
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Sorry ASME is what I was looking for. Unfortunately our industry is still greatly driven and influenced by the US. Maybe, just maybe sometime this century they will follow the rest of the world, and switch to metric, and metric standards? Novel idea I know, but maybe. ;-)
 
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Rest of the world? UK was still a mix while I was working there.

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...
 
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I believe officially the UK is now completely metric (could be wrong), but I think they are still in the transition of for everyday use. That takes a long time to get over, basically 1.5-2 generations I'm guessing.
 
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Officially they are, but back in 2004 they were certainly still a mix in the Engineering world and I doubt it's changed since.

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...
 
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Yeah, having a system of units that:

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

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
 
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Yada-yada. I'm 43 and started learning the Metric System when I was in the fifth grade (1974). Both systems were also taught extensively when I went to college (UMR). I'm utterly "bilingual" when it comes to units, as are virtually all American engineers. I've been using both with ease for 21 years in industry.

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
 
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Don,

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

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
 
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Changing unit systems = big deal! What's that take...two seconds? So it's "beeooteeeful"...how is this helping me? Give me a problem in any units; I don't care; bring it on! I can do it in my sleep. Units are the absolute least of my worries.

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
 
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Is that what NASA said?
;-)

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
 
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