3D spline

I went in on contract, and did the training course in my own time. I
thought it was fair, as they paid for the course.

 

Sorry, man, I've been through this whole thread three times, don't see 'blue
spline' anywhere (not enough pot, maybe). WTF were you quoting (name, date,
subject, interstial 4 dimensional origin)? Maybe something I blocked!?!

David Janes

 

I get it tyhat you need only a single trajectory for a 'VSS', but then why
is THIS a VSS if you can't vary the section? On, yes, you may not vary the
section with a single trajectory. That was what the second and third
trajectories were for, to vary the section along those trajectories.

What are you referencing with this angle? Sorry, we're talking about an
elipse. When sketched, it goes n/s or e/w, along the orientation lines
(dashed vertical/horizontal) of the sketch plane. I've tried centerlines and
other modifying references for an elipse. Nothing changes its orientation.

Tranpar can control only what's controllable; the ellipse shape (or rather,
orientation) is not controllable. If you think so, please demonstrate.

I do not lack the flicker, merely the wattage to reveal the detail.

David Janes

 

-------------------------------------------------

 

but then why is THIS a VSS if you

Is there a good reason to not use VSS if you want a constant
section? It is "the" sweep function with dashboard interface
(at least up to WF2, WF3?), dirt simple to set up, etc.

http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=32459&PN=2
The (pictured) volute portion is a VSS using a single arc as
trajectory, driving the section (four curves) with trajpar.
(I ~think~ the entire shape could have been done as a
single VSS, a circle traj and evalgraph(s), but that wasn't
the object of the game.)

True. The sketcher ellipse is (?) a special case,
but there's a way to get the shape...

_ Start a VSS, selecting a single trajectory.
Let's use a circle.
_ Create a pair of perpendicular centerlines coincident to
origin point, at some angular displacement relative the
X and Y sketcher references.
_ On those centerlines, place four points to define Rx, Ry
(plus and minus, symmetric about the origin).
_ Connect the four points with four conic arcs.
_ Constrain each conic arc tangent direction perpendicular
to the centerlines.
_ Tools -> Relations:
__ The dim controlling centerline angle = 0 + trajpar * 360.
__ Rho for each conic arc = sqrt(2)-1, OK.
_ Complete the feature.

You've got a torid with rotating elliptical section. The only
difference between that and using a sketcher ellipse will be
two additional seam (two sided) edges on the Y axis. (It takes
less time to do than to describe.)

I believe there are a lot of VSS tutorials floating about.
http://www.mcadcentral.com/articles/anmviewer.asp?a=13&z=2
is the only one that I could remember the location.
Web search for
pro/e "variable section sweep" | vss tutorial
turns of a lot of hits.

 

Thanks, I guess I didn't actually go through the WHOLE thread (why wouldn't
I have thought to look at the first post?) three times.

 

http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=31822&PN=1&TPN=1