Offset from lofted surface ?
IDAssociates Inc.
Jerry Steiger
"IDAssociates Inc." <ida...@att.net> wrote in message
news:quzR7.219367$3d2.10...@bgtnsc06-news.ops.worldnet.att.net...
Are you sure the cut is going the right direction? That sounds like the
error message I get when I cut the wrong way.
Try offsetting a surface 2 mm from the lofted surface. If it doesn't work,
that may be the problem and may give you a clue on how to fix things. If it
does, try cutting to that offset surface as a workaround.
Jerry Steiger
At Work Computers
EDWARD EATON
two types of face/surface geometry SoldiWorks can employ to make models.
There are two types of faces/surfaces in SolidWorks - Analytical and
Algorithmic.
Analytical surfaces/faces are circles, planes, cones, spheres, revolves.
Though only a small portion may show, the surface/face has a mathematical
definition that extends well past its border.
For instance, on a globe, even if only a patch the size of Colorado is
incorporated into a model, SW knows that the face is part of a larger sphere
and will accept 'up to surface' cuts over Europe and Asia because it can
extrapolate what the end conditions would look like because it knows that
Colorado is 'just a tiny part of a much bigger sphere'.
Algorithmic surfaces/faces are nurbs based entities that are defined by a
patchwork of control curves. Lofts generally result in nurbs surfaces,
unless SW identifies that an analtyical face can be created (for instance,
if you loft between two rectangles whose sides are parellel to each other,
SW will create planar faces instead of nurbs faces)
If you (were insane and) modelled a detailed topographical map of Colorado,
it would be a nurbs surface that would exist only up to the border of
Colorado. Even though there is a lot of detail to that surface, there is
absolutely no indication of what happens even a short distance past the
border. Are there even higher mountains, are there deep canyons, or are
there wide open planes? There is no way to know from looking at the surface
of only Colorado.
Boy I hope this metaphor isn't too lame. Because it is the best way I can
think of to explain the important distinction
Because this is what happens with SW on extrusions up to or offset from a
surface. If you are extruding up to/offset from an analytical surface, you
can overlap as much as you want and SoldiWorks will figure out what is
supposed to be there. But, if you extrude up to a lofted surface, SW can't
know how the surface is supposed to continue, and it tells you 'hey,pal -
the extrusion is too oversized for the surface you want to end it at. I
have no idea what should happen int he undefined areas!'.
The workaorunds
1) be sure the border of your extrusion is completely contained within the
extents of the face/surface you are extruding up to (and, remember, if it is
a thin feature you have to account for the thickness - everyhting must fall
within the border or it will fail)
2) make a copy of the face/surface, manually extend it so it passes the
border of your extrusion, and extrude up to/offset from the extruded
surface.
Hope this helps
"IDAssociates Inc." <ida...@att.net> wrote in message
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Adam Reif
> Boy I hope this metaphor isn't too lame. Because it is the best way I can
> think of to explain the important distinction
I'm LOVIN' that metaphor!
> it tells you 'hey,pal - the extrusion is too oversized for the surface you
> want to end it at. I have no idea what should happen in the undefined
areas!'
If work gets too slow, you could always be a SWX error text writor/editor ;)
Adam.
EDWARD EATON
Regards
-Ed
"Adam Reif" <1adam12...@inforum.net> wrote in message
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