Inventor General Discussion

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*Caldwell, Larry
Message 11 of 14 (28 Views)

Re:

02-19-2003 10:09 PM in reply to: *Case, Mark
Lucked out this time, already know about boundaries, just forgot because I
don't have any close pins probably. If that's what he's talking about,
something similar to that might come in handy. I was thinking he wanted
projected reference lines to ... what ... change their size to make a closed
loop I guess, but then they wouldn't be reference lines any more. I can see
where window picking the rectangle to create a boundary of the enclosed area
would be useful in several areas. See ... AutoCAD mentality ain't bad all
the time I guess.
~Larry

"Kent Keller" wrote in message
news:2DC17513A3C4C2CBDCDD98AAC28D8774@in.WebX.maYIadrTaRb...
> I may be misunderstanding all this myself, but ... I think what Mark may
be
> looking for is a equivalent of the vanilla "Boundry" command.
>
> If you aren't familiar, put a clothespin on your nose and open AutoCAD.
> Draw two overlapping circles and then type in -boundary and select in
the
> area shared by the two circles. Now type in Move and do a crossing
window
> of that area... you should have ahold of a shape the same as the shared
> area.
>
> In derived sketch modeling I could see the value in a tool like this.
>
> Oh... yeah... wait 15 minutes and then remove the clothespin
>
> --
> Kent Keller
> Member of the Autodesk Discussion Forum Moderator Program
>
> http://www.MyMcad.com/KWiK/Mcad.htm
>
> "Larry Caldwell" wrote in message I'm not sure
> > what the "iPoly" would do that can't already be done the way IV is set
up
> at
> > present. Do I understand what you are saying correctly?
>
>
*Case, Mark
Message 12 of 14 (28 Views)

Re:

02-20-2003 04:51 AM in reply to: *Case, Mark
OK Larry :smileywink: Now were talking. Thanks for the nudge and the color(er..odor)
Kent.

Often, the profile I am trying to extrude is based on several segments
projected from several different features, that are then spliced together
with a few arcs and/or lines to form a closed area. Unfortunately the
reference(projected) lines are often longer that what is needed for the new
profile, hence the need to add 'extra' geometry on top to allow a profile to
be detected -or- for the profile detection to work like bPoly does.

I have an example of exactly what I'm talking about, but it's based on the
Feb. modeling challenge, so I won't post it until tomorrow. I don't want
taint challenge by posting my version before the deadline...

Mark

"Larry Caldwell" wrote in message
news:4A89A7D81B270C3B0B32C84698E4DB7D@in.WebX.maYIadrTaRb...
> Lucked out this time, already know about boundaries, just forgot because I
> don't have any close pins probably. If that's what he's talking about,
> something similar to that might come in handy. I was thinking he wanted
> projected reference lines to ... what ... change their size to make a
closed
> loop I guess, but then they wouldn't be reference lines any more. I can
see
> where window picking the rectangle to create a boundary of the enclosed
area
> would be useful in several areas. See ... AutoCAD mentality ain't bad all
> the time I guess.
> ~Larry
>
*Caldwell, Larry
Message 13 of 14 (28 Views)

Re:

02-20-2003 05:18 AM in reply to: *Case, Mark
Oooh ... which reminds me Peer told me to get off my duff on that so I guess
I better get to it.

I can see what you're suggesting, and it sounds like it might be worth while
in certain circumstances, although I'm not sure how much time it would
really save if we were counting seconds. I can see a profile coming out fine
if the projected geometry is too long, but what would happen if the
projected geometry is too short, and would the projected profile be
reference or normal? The way it is now, normal geometry doesn't
automatically constrain itself to the origin, so if the geometry is normal
then it would still need to be dimensioned to the origin; if it's reference,
then we're back to the same problem as before unless the enclosed profile is
the exact shape you want and wouldn't require any modifications.
~Larry


"Mark Case" wrote in message
news:5677F76BA9C528D6722E10F30F93537F@in.WebX.maYIadrTaRb...
> OK Larry :smileywink: Now were talking. Thanks for the nudge and the color(er..odor)
> Kent.
>
> Often, the profile I am trying to extrude is based on several segments
> projected from several different features, that are then spliced together
> with a few arcs and/or lines to form a closed area. Unfortunately the
> reference(projected) lines are often longer that what is needed for the
new
> profile, hence the need to add 'extra' geometry on top to allow a profile
to
> be detected -or- for the profile detection to work like bPoly does.
>
> I have an example of exactly what I'm talking about, but it's based on the
> Feb. modeling challenge, so I won't post it until tomorrow. I don't want
> taint challenge by posting my version before the deadline...
>
> Mark
>
> "Larry Caldwell" wrote in message
> news:4A89A7D81B270C3B0B32C84698E4DB7D@in.WebX.maYIadrTaRb...
> > Lucked out this time, already know about boundaries, just forgot because
I
> > don't have any close pins probably. If that's what he's talking about,
> > something similar to that might come in handy. I was thinking he wanted
> > projected reference lines to ... what ... change their size to make a
> closed
> > loop I guess, but then they wouldn't be reference lines any more. I can
> see
> > where window picking the rectangle to create a boundary of the enclosed
> area
> > would be useful in several areas. See ... AutoCAD mentality ain't bad
all
> > the time I guess.
> > ~Larry
> >
>
>
>
*Case, Mark
Message 14 of 14 (28 Views)

Re:

02-21-2003 08:27 AM in reply to: *Case, Mark
OK, it's posted in CF

To illlustrate my point, I created a single shared sketch to define the web
with the "T" shaped cross section and the open area in the center of the
part.

I posted threee *.ipts in three different states:

1) beforeprojections.ipt -- Contains all of the sketch geometry that
cannot be projected from existing features.

2) geometryprojected.ipt -- This version is what I would expect IV to
recognize a profile from. I projected in all of the geometry that is at
least partly coincident with the boundary and added three lines to fill in
the gaps to form a completely constrained, closed, area bounded by lines and
arcs. Someone afflicted with AE(AutoCAD Envy) would expect this to be
sufficient to define a profile for extrusion. I'll admit life would've been
a bit easier if I'd modeled the holes in the cylindrical features and
projected their edges into this sketch.

NOTE: AE is a less chronic condition than IC (Inventor Cheerleader.) I am
afflicted with both.

3) withextrageometry.ipt -- This version has about 10 extra lines drawn in
and (automatically) constrained to the underlying reference geometry, so
that the outer profile is recognized by the extrude command.

I can see from looking at this month's winner that ONE way to avoid this
situation is to put everthing possible in to a single sketch and then the
projected geometry isn't required(for this part anyway.) Nice job Jayson!

Mark
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