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"HomeMadeSin" <I
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.-1@WebX.maYIadrTaRb">news:f129fe2.-1@WebX.maYIadrTaRb...
have a need to form what is known as a Francis vane impeller (double
curvature). Lucky me, huh? Anyway, I understand the loft method for generating
a shape from multiple planar sketches, but how on earth can you generate a 3D
sketch on a non-planar surface??? As far as I can tell, 3D sketch is only for
sweeps. A couple of good similar examples of what I'm trying to do would be
either a propeller for a airplane or a boat if you were trying to do the
lofting outward, STARTING (I repeat - STARTING) from the hub surface which for
both of these objects are curves....Thanks in advance.
Troy Zellers
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
"HomeMadeSin" <I
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.-1@WebX.maYIadrTaRb">news:f129fe2.-1@WebX.maYIadrTaRb...
have a need to form what is known as a Francis vane impeller (double
curvature). Lucky me, huh? Anyway, I understand the loft method for generating
a shape from multiple planar sketches, but how on earth can you generate a 3D
sketch on a non-planar surface??? As far as I can tell, 3D sketch is only for
sweeps. A couple of good similar examples of what I'm trying to do would be
either a propeller for a airplane or a boat if you were trying to do the
lofting outward, STARTING (I repeat - STARTING) from the hub surface which for
both of these objects are curves....Thanks in advance.
Troy Zellers
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
"HomeMadeSin" <Ok.
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.6@WebX.maYIadrTaRb">news:f129fe2.6@WebX.maYIadrTaRb...
I found the file and downloaded it. I agree it is a excellent treatment of
lofting, however, all of the sketches are planar. This is easy. I'm talking
about establishing a sketch ON A CURVED surface and using it as loft ...er
plane..
Any ideas?
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"HomeMadeSin" <Thanks
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.8@WebX.maYIadrTaRb">news:f129fe2.8@WebX.maYIadrTaRb...
Tom.
Frankly, this is one of my fears (that Inventor isn't set-up - yet - to do
this type of feature). I just couldn't face learning P/E. Besides, at another
pump manufacturer, the P/E guys didn't tackle this issue either - they "faked"
it for visual purposes, not actual dimensions.
I would try MDT.....something else to learn.
Troy
Zellers
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
"HomeMadeSin" <I
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.-1@WebX.maYIadrTaRb">news:f129fe2.-1@WebX.maYIadrTaRb...
have a need to form what is known as a Francis vane impeller (double
curvature). Lucky me, huh? Anyway, I understand the loft method for generating
a shape from multiple planar sketches, but how on earth can you generate a 3D
sketch on a non-planar surface??? As far as I can tell, 3D sketch is only for
sweeps. A couple of good similar examples of what I'm trying to do would be
either a propeller for a airplane or a boat if you were trying to do the
lofting outward, STARTING (I repeat - STARTING) from the hub surface which for
both of these objects are curves....Thanks in advance.
Troy Zellers
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
"HomeMadeSin" <Matt:
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.11@WebX.maYIadrTaRb">news:f129fe2.11@WebX.maYIadrTaRb...
I'm re-creating a part from a hand-drawn file dating back to 1967. I would
have to imagine that many face the same issues with converting old 2D to 3D
drawings.
At any rate, either old and redrawn or new design, it is necessary to
define the lower edge of the vane and the upper edge and loft between if no
intermediate sections are available (they aren't in my case). The problem is
the lower surface that applies to the lower edge or profile of the vane is
curved, so a planar sketch beneath the curved surface would allow me to
generate a vane, but it would be completely different than the actual piece.
It seems the correct way to do it (if programmed) is to create a 3D sketch
(actually 2) and loft between. Then the difference between the actual part and
the 3D model would be how the loft was done (computer versus pattern maker). I
could live with that. Unfortunately, the tools in IV don't seem to accomodate
3D sketches used for lofts or the creation of a 3D sketch via a 2D sketch
projected on a surface (not a planar surface). Until then, I'll have to do
what I am doing: sending the actual vane to a 3D scanner and input into 3D
file (the vendor uses Solidworks) and drop the "dumb" file into the overall
drawing. It is a work around that I hope is not permanent (rev.
7???)
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"HomeMadeSin" <Thanks
href="mailto:tzellers@mdminc.com">tzellers@mdminc.com> wrote in message
href="news:f129fe2.8@WebX.maYIadrTaRb">news:f129fe2.8@WebX.maYIadrTaRb...
Tom.
Frankly, this is one of my fears (that Inventor isn't set-up - yet - to do
this type of feature). I just couldn't face learning P/E. Besides, at another
pump manufacturer, the P/E guys didn't tackle this issue either - they "faked"
it for visual purposes, not actual dimensions.
I would try MDT.....something else to learn.
Troy
Zellers
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