Controlling Out of Plane angular variation on a 'wedge'
Controlling Out of Plane angular variation on a 'wedge'
(OP)
One I've been noodling for a while and the answer hasn't come to me - though I admit I need to spend more time actually looking at the standard.
However, if someone could point me the right direction I'd appreciate it.

Trying to control the top angled surface, control of angle is more important than overall location.
Specifically looking to add control on the 'out of plane' angle. Something like any 'line element' in that orientation should be parallel to datum A within .001.
Seems profile of a line could do this, but how to express it. Does putting it in the existing FCF work or seems that may be confusing.
Thoughts?
Thanks.
However, if someone could point me the right direction I'd appreciate it.

Trying to control the top angled surface, control of angle is more important than overall location.
Specifically looking to add control on the 'out of plane' angle. Something like any 'line element' in that orientation should be parallel to datum A within .001.
Seems profile of a line could do this, but how to express it. Does putting it in the existing FCF work or seems that may be confusing.
Thoughts?
Thanks.
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What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?





RE: Controlling Out of Plane angular variation on a 'wedge'
RE: Controlling Out of Plane angular variation on a 'wedge'
I had the standard open at the page before!
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Controlling Out of Plane angular variation on a 'wedge'
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Controlling Out of Plane angular variation on a 'wedge'
Your file's link is: http://files.engineering.com/getfile.aspx?folder=4...
2JL
Ps how do you add you pict directly inside the post?
RE: Controlling Out of Plane angular variation on a 'wedge'
Your proposed datum B is not parallel to the line elements I'm trying to control so no, it's not correct.
You could potentially add a second line to the FCF with perpendicularity to your proposed datum B if that better reflects part function but in my case it doesn't.
There are 2 image related buttons on the ribbon bar at the top of where you type to post, one is to insert an image from somewhere online, the other is to upload an image and then insert it. You can also code it using TGML.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Controlling Out of Plane angular variation on a 'wedge'
RE: Controlling Out of Plane angular variation on a 'wedge'
Could you explain the practical application of "each element" in that parallelism control? Does it apply to the edges of the face(s)? Does it apply to any linear measurement (parallel to the datums referenced) taken on that flat surface? Is it simply "best practice" as to how many 'lines' you inspect?
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NX8.0, Solidworks 2014, AutoCAD, Enovia V5
RE: Controlling Out of Plane angular variation on a 'wedge'
Figure 6-16 is pretty clear in the -1994 version with several lines of description below it, but the text of 6.5.5 is fairly brief.
As to how to inspect it - not my problem as I'm the designer not QA.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Controlling Out of Plane angular variation on a 'wedge'
I am trying to see it as "Straightness with datum" (if you can think of Parallelism/Perpendicularity/Angularity as "Flatness with datum")
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: Controlling Out of Plane angular variation on a 'wedge'
I was just wondering if the angularity would be checked only at the verteces. This would allow for the middle of that face to sink (or dome upward) anywhere within the .010 profile tolerance zone. That would not be in line with your intent, I don't think. So I was thinking I may be confused on 'each element'... BUT I do believe your INTENT is quite clear - I think any "reasonable" person would see it and know "what to do".
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NX8.0, Solidworks 2014, AutoCAD, Enovia V5
RE: Controlling Out of Plane angular variation on a 'wedge'
Regarding your post from 15 Sep 15 22:29, yes, this is how it could be done, but...
2JL's idea to have one of side faces as datum feature B is not incorrect, even though datum B derived from that feature would not be nominally parallel, but perpendicular to the line elements. The role of a secondary datum feature reference in that kind of callouts is to constrain rotational degrees of freedom of the line elements.
There is no example in the '94 standard, but in the '09 version you may take a look at fig. 6-4 to see what I mean.