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Bug (??) with Feature Control Frame

9 REPLIES 9
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Message 1 of 10
hallstevenson
794 Views, 9 Replies

Bug (??) with Feature Control Frame

As you can see from the attached screenshots, I've ran into an issue when using a feature control frame *with* a datum identifier. The datum ID is causing a gap in the dimension line that it attaches to. This occurs whether I attach the FCC to the dimension line or the relevant geometry.

My screenshots show how the gap "follows" the "-D-" ID. If I flip it inside though, it's okay. I'm not sure if an ANSI standard says where to locate FCCs but we always put ours on the outside.
9 REPLIES 9
Message 2 of 10
Anonymous
in reply to: hallstevenson

The ANSI standard doesn't say specifically where to attach, however all
the pictorial examples show the feature control frame attached at the
end with the geometric characteristic symbol (left side of the feature
control frame).

hallstevenson wrote:
> As you can see from the attached screenshots, I've ran into an issue when using a feature control frame *with* a datum identifier. The datum ID is causing a gap in the dimension line that it attaches to. This occurs whether I attach the FCC to the dimension line or the relevant geometry.
>
> My screenshots show how the gap "follows" the "-D-" ID. If I flip it inside though, it's okay. I'm not sure if an ANSI standard says where to locate FCCs but we always put ours on the outside.
>
>
> ------------------------------------------------------------------------
>

--
Hal Gwin
Mechanical Designer
Xenogen

R9 Pro SP2
XP Pro SP2
Dell Precision 650
Dual 2.66 GHz Xeon
3 GB DDR
Quadro4 900 XGL
nVidia 6.14.10.7718 w/registry update
Dell UltraSharp 19" LCD
Message 3 of 10

I just looked at the ANSI standard myself and all of the examples are as you say.... Could I argue that because it's a datum identifier it needs to be "attached" the geometry (or associated dim line) ??

Then again, there's clearly some problem with the datum ID that's creating the gap. Fix that.
Message 4 of 10
Anonymous
in reply to: hallstevenson

You datum identified is considered a "Former Practice", ASME Y14.5M-1994
[Revision of ANSI Y14.5M-1982(R1988)] Reaffirmed 1999. I use the
example shown in Fig 3-23, page 48, in the above referenced standard
without any problems like you are seeing. A jpg is attached, the datum
identifier can extend above or below the feature control frame.

hallstevenson wrote:
> I just looked at the ANSI standard myself and all of the examples are as you say.... Could I argue that because it's a datum identifier it needs to be "attached" the geometry (or associated dim line) ??
>
> Then again, there's clearly some problem with the datum ID that's creating the gap. Fix that.

--
Hal Gwin
Mechanical Designer
Xenogen

R9 Pro SP2
XP Pro SP2
Dell Precision 650
Dual 2.66 GHz Xeon
3 GB DDR
Quadro4 900 XGL
nVidia 6.14.10.7718 w/registry update
Dell UltraSharp 19" LCD
Message 5 of 10

Well that sucks.... 🙂 Then again, this can be a good time to implement the current ANSI standards. When someone questions it and says "this isn't how we do it", I can respond that it how ANSI says we should.

Even easier: Tell them that Inventor won't do it (properly ??) the old way.
Message 6 of 10
Anonymous
in reply to: hallstevenson

Thanks for pointing this out. The gap is caused by the FCF's overall
clipping box. Although you can not turn off the clipping action for this
FCF, here is a something to try to get the desired effects:

Create the FCF without the datum id and attach it to the outside of the
dimension extension line like you want. Now create a Datum Id symbol and
attach it to the bottom of the FCF. If the Datum Id leader is shown then
move the Datum Id box close to the FCF box. The leader will be removed and
the boxes will snap together.

Steven Trudeau
Inventor Software Developer
Autodesk, Inc.

wrote in message news:4957434@discussion.autodesk.com...
As you can see from the attached screenshots, I've ran into an issue when
using a feature control frame *with* a datum identifier. The datum ID is
causing a gap in the dimension line that it attaches to. This occurs whether
I attach the FCC to the dimension line or the relevant geometry.

My screenshots show how the gap "follows" the "-D-" ID. If I flip it inside
though, it's okay. I'm not sure if an ANSI standard says where to locate
FCCs but we always put ours on the outside.
Message 7 of 10

That did work but when it kept showing the datum leader, it was confusing and I thought I wouldn't be able to place it without a leader. Key thing is, IGNORE the leader and bump it into the FCF box like you say 'til you get the 'mate' type icon, then drop it.

On a similar note, and this may be due to out-of-date ANSI compliance on our part, don't datum IDs normally have a 'dash' on both sides of the letter ?? It's no big deal adding them in the text-entry dialog though.
Message 8 of 10
Anonymous
in reply to: hallstevenson

Perhaps a "Symbol Clipping" function added to FCF's (as Sketched Symbols
have) would be a viable solution that could be actively pursued.

QBZ


"Steve Trudeau (Autodesk)" wrote in message
news:4958907@discussion.autodesk.com...
Thanks for pointing this out. The gap is caused by the FCF's overall
clipping box. Although you can not turn off the clipping action for this
FCF, here is a something to try to get the desired effects:

Create the FCF without the datum id and attach it to the outside of the
dimension extension line like you want. Now create a Datum Id symbol and
attach it to the bottom of the FCF. If the Datum Id leader is shown then
move the Datum Id box close to the FCF box. The leader will be removed and
the boxes will snap together.

Steven Trudeau
Inventor Software Developer
Autodesk, Inc.
Message 9 of 10
Anonymous
in reply to: hallstevenson

Not any more, that went out with the 1988 revision I believe.

hallstevenson wrote:
>
> On a similar note, and this may be due to out-of-date ANSI compliance on our part, don't datum IDs normally have a 'dash' on both sides of the letter ?? It's no big deal adding them in the text-entry dialog though.

--
Hal Gwin
Mechanical Designer
Xenogen

R9 Pro SP2
XP Pro SP2
Dell Precision 650
Dual 2.66 GHz Xeon
3 GB DDR
Quadro4 900 XGL
nVidia 6.14.10.7718 w/registry update
Dell UltraSharp 19" LCD
Message 10 of 10
mark.trotter
in reply to: Anonymous

The dashes on either side of the Datum symbol are from the 1994 revision.  Current practice is to use the supplied Datum symbol identifier with the filled or non-filled traingle on the bottom.  Using the Datum symbol inside Inventors FCF pick box is not an acceptable ASME practice and should be avoided.  As far as using a Datum Feature symbol, we place ours on top or on the bottom of the FCF, or directly on the part itself.  It would be nice to be able to add it to the dimension but I believe this is also not an acceptable ASME practice.

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