Loft problem

[Anonymous]

I have posted a example in IVCF with the same subject line.

This is just a example of the problem, the actual file I am working on
has this loft too far up the browser tree to be able to delete it and
recreate it.

Open the file and edit 3d sketch 1 and 2 and add a 6" radius to each
joint. This should make the loft fail. How can I go about fixing the
loft now. Is there any way to redefine the features of the loft? I am
not finding any method to remove anything in the Sections box.

--
Kent Keller
http://www.MyMcad.com/KWiK/Mcad.htm

Assistant Moderator
Autodesk Discussion Forum Moderator Program

[Anonymous]

It appears there is something about lofts I don't understand. I am
finding that if I add the bends to the 3d sketch and then try to loft it
won't do it. Anybody know why that is?

Also I am having a lot of trouble with a projected line from a 3d sketch
constantly turning pink, and loosing all my constraints to it. Is this
a common problem with 3d sketches?

--
Kent Keller
http://www.MyMcad.com/KWiK/Mcad.htm

Assistant Moderator
Autodesk Discussion Forum Moderator Program

"Kent Keller" wrote in message
news:D40594E7ABE9B11C0EF8E652EC5BCDFE@in.WebX.maYIadrTaRb...
> I have posted a example in IVCF with the same subject line.

[Anonymous]

Hi, Kent.

As for re-defining the sections... you can pick the sections in the dialog
and hit . (That's intuitive, isn't it?)

There's something I don't understand about the 3D sketches after adding the
fillets. They (the combination of intersection curves and fillets) are not
being treated as continuous curves. I think this would qualify as a bug
unless there's a procedure that I'm not aware of to rectify the condition.
Just seems to be a problem with database management.

Is it possible that you could get what you want by filleting the lofted
surface instead of the 3D sketches?

Can't help with the pink stuff. Inventor should ship with "Pink Stuff
Happens" buttons. Might just try re-booting, as I don't think there's any
rhyme or reason to some of it. I can't say it's an extremely common problem,
but seen often enough.

================


"Kent Keller" wrote in message
news:B22FC6C78AB7E7EBBC1273FE83DE1633@in.WebX.maYIadrTaRb...
> It appears there is something about lofts I don't understand. I am
> finding that if I add the bends to the 3d sketch and then try to loft it
> won't do it. Anybody know why that is?
>
> Also I am having a lot of trouble with a projected line from a 3d sketch
> constantly turning pink, and loosing all my constraints to it. Is this
> a common problem with 3d sketches?
>
> --
> Kent Keller
> http://www.MyMcad.com/KWiK/Mcad.htm
>
> Assistant Moderator
> Autodesk Discussion Forum Moderator Program
>
> "Kent Keller" wrote in message
> news:D40594E7ABE9B11C0EF8E652EC5BCDFE@in.WebX.maYIadrTaRb...
> > I have posted a example in IVCF with the same subject line.
>
>

[Anonymous]

Thanks Jeff, good to see you here. 8^)

I have gotten so used to context menu's that I didn't even think of
using the keyboard. 8^) Nothing like consistency throughout

Unfortunately it isn't really the loft I need to fillets on, it is the
3d paths. The loft is just to create some 3d paths for diagonal
supports between the first two 3d paths. Thought I had this figured
out, but now I am beginning to question the approach I am using.

Any time I edit this 3d path the projected line turns pink. I was able
to do some relational dimensions in this case to get around the need for
the projected line, but other places I don't think that will work. This
file has been closed and opened a number of times so that doesn't help
any.

I just came across another interesting issue. If I have two same size
tubes 90º to each other and extrude the second tube to the first it does
it without problems if I use solids, but if I use surfaces it fails
every time.

Oh well what fun would it be if everything worked like it is supposed
to. 8^/

Thanks for the pointers and help.

--
Kent Keller
http://www.MyMcad.com/KWiK/Mcad.htm

Assistant Moderator
Autodesk Discussion Forum Moderator Program

"Jeff Howard" wrote in message
news:60FDF6622BD19CD97193A55AAF30A79C@in.WebX.maYIadrTaRb...
> Hi, Kent.
>
> As for re-defining the sections... you can pick the sections in the
dialog
> and hit . (That's intuitive, isn't it?)
>
> There's something I don't understand about the 3D sketches after
adding the
> fillets. They (the combination of intersection curves and fillets)
are not
> being treated as continuous curves. I think this would qualify as a
bug
> unless there's a procedure that I'm not aware of to rectify the
condition.
> Just seems to be a problem with database management.
>
> Is it possible that you could get what you want by filleting the
lofted
> surface instead of the 3D sketches?
>
> Can't help with the pink stuff. Inventor should ship with "Pink Stuff
> Happens" buttons. Might just try re-booting, as I don't think there's
any
> rhyme or reason to some of it. I can't say it's an extremely common
problem,
> but seen often enough.

[xavierl]

with the two tubes a 90 deg to each other. extrude the profile and use 'to next' and select 'terminator' and click on other pipe and it works. from little trial and lots of error it seems with solids the 'to next ' is default selected but not with surfaces.
regards
frans x liebenberg

[Anonymous]

"Kent Keller" wrote in message
news:D3C158F8C6BBB948DC2F1502E12497A5@in.WebX.maYIadrTaRb...
> ................
> Unfortunately it isn't really the loft I need to fillets on, it is the
> 3d paths. The loft is just to create some 3d paths for diagonal
> supports between the first two 3d paths. Thought I had this figured
> out, but now I am beginning to question the approach I am using.

After the lofted surf is filleted the edge can be used for the sweep path? If
it won't accept the edge for a path maybe you can create new 3D sketches and
"Include Geometry" the edges.
-----------------------------------

> Any time I edit this 3d path the projected line turns pink. I was able
> to do some relational dimensions in this case to get around the need for
> the projected line, but other places I don't think that will work. This
> file has been closed and opened a number of times so that doesn't help
> any.

This may have something to do with the same database management problems that
I think are the reason for the "discontinuous sements" after filleting the
intersection curves. I've never attempted to manipulate intersection curves
(add fillets, etc.), so don't have much to offer. It seems it isn't a good
idea, at least at present.
-------------------------------------

> I just came across another interesting issue. If I have two same size
> tubes 90º to each other and extrude the second tube to the first it does
> it without problems if I use solids, but if I use surfaces it fails
> every time.

Yeah, this has always been a problem for Autodesk. A couple of releases back
it would fail even with solids (the intersecting tube would have to be some
minute amount smaller to get it to work). Why surfaces and solids react
differently is a mystery, as it all involves finding surface intersections to
establish trim lines. Possibly the surface normals (for non-solid faces)
contribute to the difference. I haven't played with it much, but it sounds
like Frans has got a handle on it.
---------------------------------------

> Oh well what fun would it be if everything worked like it is supposed
> to. 8^/

So true!
--------------------------------------

Have a good one.
===================================

[xavierl]

see iv cf.
I put 2 new 3d sketch lines in with bends of 2 and 3 inches rad. it lofted ok as surface.
did you put bends on each original sketch? all I can think of is that the resultant 3d intersection curve becomes something with a lot of definition points and the loft guide lines get confused or start twisting.(lofts seem to want to have the same number of definition points on each curve, unless you force the lines with automatic mapping unchecked in transition in loft dialog box.)
regards
frans x liebenberg

[Anonymous]

Thanks Frans
I don't understand what is different that it works on the 3d lines that
you made. Every time I tried before it would only select one of the 3d
lines when trying to do the loft. Try moving the EOP marker up to just
under 3D Sketch2 and then edit 3D sketch 1 and 2 adding 2 6" radius
corners to each. Now try to loft between those 2..... I still can't
get it to do it there.

At any rate I think I am going to have to take another approach to this
part of it.

As for the intersection of the 90º tubes, you are right, .... "To Next"
works, but if you use "To" and it works as a solid one would expect it
should work as a surface also.

Thanks Frans and Jeff.

--
Kent Keller
http://www.MyMcad.com/KWiK/Mcad.htm

Assistant Moderator
Autodesk Discussion Forum Moderator Program

"fxlxd" wrote in message
news:f185f71.5@WebX.maYIadrTaRb...
> see iv cf.
> I put 2 new 3d sketch lines in with bends of 2 and 3 inches rad. it
lofted ok as surface.
> did you put bends on each original sketch? all I can think of is that
the resultant 3d intersection curve becomes something with a lot of
definition points and the loft guide lines get confused or start
twisting.(lofts seem to want to have the same number of definition
points on each curve, unless you force the lines with automatic mapping
unchecked in transition in loft dialog box.)
> regards
> frans x liebenberg

[Anonymous]

Kent,

just so you know I have logged this in our database

(for adsk staff looking, this is CR ID 518195)

--
Best Regards
Richard Rankin
Autodesk Manufacturing Solutions (Support)