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Guest
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 Posted:
Thu Dec 08, 2005 9:10 pm Post subject:
creating a point at the center of an area |
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I can use the properties to locate the center of area, but how do I
creat a point in that location.
For example: create a point in the center of area of a triangle.
Thank you
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Dale Dunn
Guest
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| Posted:
Fri Dec 09, 2005 1:10 am Post subject:
Re: creating a point at the center of an area |
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| Quote: | Also, my company often asks for section modulii which solidworks
doesn't compute (I have to use ProE to calculate this, and I hear about
it from the ProE guys). I'd love to have this integrated also.
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Get the section into DWGEditor. Use the REGION command to make a region of
the entities that define the section. (A region is like a 2d solid. No, not
a surface!) Then use the MASSPROP command to get all sorts of info on the
section.
I thought I remembered seeing a tool for this in SW somewhere, but I can't
find it now. |
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Dan S.
Guest
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| Posted:
Fri Dec 09, 2005 1:10 am Post subject:
Re: creating a point at the center of an area |
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I use the section data to locate the point. Take a section, write down
the coordinates, and then create a sketch using thoses coordinates.
This will work until you change the geometry and the center moves. I'd
love another way, and maybe there is one.
Also, my company often asks for section modulii which solidworks
doesn't compute (I have to use ProE to calculate this, and I hear about
it from the ProE guys). I'd love to have this integrated also.
Dan Sommerfeld
Industrial Designer
ITW Dahti Technologies
Randle.Domico@gmail.com wrote:
| Quote: | I can use the properties to locate the center of area, but how do I
creat a point in that location.
For example: create a point in the center of area of a triangle.
Thank you |
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Wayne Tiffany
Guest
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| Posted:
Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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Aren't you guys sort of missing the point? The OP said that he could read
the coordinates by using the Tools/Section Properties tool. But then how
does he put a point there? Manually typing those numbers into a 3D sketch
is a way that would work. But, I would think that those numbers would be
available to the API, so I think what he wants is a macro just like the one
we have for putting a 3D point at the CG. There are 2 macros that do that -
one that puts a new point every time you run it, and the other that updates
the one existing point. Both are static in that they don't automatically
update. So, someone with some time could take the CG macro and rewrite it
to a Center of Area macro. I don't have the time right now - any takers up
to the challenge?
WT
"Dale Dunn" <daledunnSCRATCH@jamestool.com> wrote in message
news:Xns9726C4AFA84ECdaledunnatjamestoolc@65.24.3.139...
| Quote: |
Also, my company often asks for section modulii which solidworks
doesn't compute (I have to use ProE to calculate this, and I hear about
it from the ProE guys). I'd love to have this integrated also.
Get the section into DWGEditor. Use the REGION command to make a region of
the entities that define the section. (A region is like a 2d solid. No,
not
a surface!) Then use the MASSPROP command to get all sorts of info on the
section.
I thought I remembered seeing a tool for this in SW somewhere, but I can't
find it now. |
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Dale Dunn
Guest
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| Posted:
Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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"Wayne Tiffany" <wayne.tiffanyRMVJUNK@asi.com> wrote in
news:1134136893.1670cfa903cceb21db8e0dc23f78f6cc@roc.usenetexchange.com:
| Quote: | Aren't you guys sort of missing the point? The OP said that he could
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You're right. I did miss the point. Section modulus is just I/y, so it can
easily be calculated by hand if you know where the neutral axis is. Of
course, that may not be trivial... Come to think of it, the MASSPROP
command won't give it either because the bend direction isn't specified.
This needs a macro, I suppose.
I don't have time for either macro. How often does this center of area need
to be dealt with? Often enough to be worth the trouble? Otherwise I
recommend what Dan suggested, but using copy & paste with Notepad, instead
of writing things down.
On the other hand, ModelDocExtension::GetSectionProperties2 looks like a
very straightforward method. Perhaps it wouldn't be too hard to modify the
CG macro, if the OP can't find any volunteers, this might be a good
opportunity to get his feet wet with macros. Modifying an existing macro is
easier than starting from scratch. |
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George
Guest
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Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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You can add a "Reference Point" to the "Center of Face" on any shape
surface...
Insert/Reference Geometry/Point
This is the same tool used for inserting a plane or an axis. See
Reference Geometry.
This is not to be confused with...
Tools/Sketch Entities/Point |
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Jeff
Guest
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| Posted:
Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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if you are looking for a way to generate a point at the center of mass,
which is what it kinda sounds like, there was a post about a week ago
that had a macro that would generate a point at the center... hope
that helps...
Jeff |
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Dale Dunn
Guest
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| Posted:
Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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| Good one. It's easy to forget about reference points. |
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Wayne Tiffany
Guest
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| Posted:
Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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Ahhh, touche. I don't believe I have ever used that one, but I think it
hits the nail in the head here as the best solution without a macro. If you
add the point and then modify the shape of the face, then the point will not
move on its own. However, if you then edit the definition of that reference
point, it will update properly. You can use that point to attach lines,
etc. (Don't forget to turn on the viewing of points.)
That's why I like this group - thanks.
WT
"George" <greilly@zoll.com> wrote in message
news:1134143590.581278.176580@g49g2000cwa.googlegroups.com...
| Quote: | You can add a "Reference Point" to the "Center of Face" on any shape
surface...
Insert/Reference Geometry/Point
This is the same tool used for inserting a plane or an axis. See
Reference Geometry.
This is not to be confused with...
Tools/Sketch Entities/Point
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George
Guest
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| Posted:
Fri Dec 09, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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FYI - I sketched a triangle and extruded it. I then inserted the
reference point. Click on the point and record the coordinates. If you
then go back to the triangle sketch and drag one of the vertexes and
leave the sketch the reference point has moved to the new centroid of
the area. (SW2006SP2)
~G |
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George
Guest
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| Posted:
Fri Dec 09, 2005 9:10 pm Post subject:
Re: creating a point at the center of an area |
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Wayne, I tried your method too and all updated, even the point. It is
now in a different location. Strange ... it works both ways for me and
I cannot recreate your scenerio.
I contribute this to Bermuda Triangle Surface rather than Boolean
Triangle Surface.... goof luck!!
Its snowing like crazy here so I think I am going to cut out.
Have a nice weekend.
~G |
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Wayne Tiffany
Guest
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| Posted:
Fri Dec 09, 2005 9:10 pm Post subject:
Re: creating a point at the center of an area |
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Now that is interesting. The way I tested it was by changing the shape by
double-clicking to show a dimension, change the dim, then rebuild. The
model and the face updated, but the point did not. But if you go into the
sketch to make the change, the point will update when you come out. You
don't have to rebuild to come out, just close the sketch. So, two different
methods - I wonder if SW knows about this??
WT
"George" <greilly@zoll.com> wrote in message
news:1134147076.459912.220080@g43g2000cwa.googlegroups.com...
| Quote: | FYI - I sketched a triangle and extruded it. I then inserted the
reference point. Click on the point and record the coordinates. If you
then go back to the triangle sketch and drag one of the vertexes and
leave the sketch the reference point has moved to the new centroid of
the area. (SW2006SP2)
~G
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chub
Guest
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| Posted:
Sat Dec 10, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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I have yet to find a way to create a point at COB in drawing mode.
If I do the "Tools/Sketch Entities/Point" command in PART mode the
point it works good, but will not show in DRAWING mode.
hmm......
any ideas??? |
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chub
Guest
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| Posted:
Sat Dec 10, 2005 5:10 pm Post subject:
Re: creating a point at the center of an area |
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Thank you all for he helpful information.
The "Tools/Sketch Entities/Point" command work great for faces.
What I have been trying to find is a way to creat a point in the COG of
a chained 2d object witout going into DWG editor. It would be nice to
be able to create the point while in sketch mode but the above command
will work for what I need.
I use this to determine the center of effort in relation to the center
of lateral resistence in sailboat design.
Thanks,
Randle |
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Dale Dunn
Guest
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| Posted:
Sat Dec 10, 2005 9:10 pm Post subject:
Re: creating a point at the center of an area |
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I just noticed that you can import these into the drawing using Import
Model Items. |
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