Mid-curve between 2 other curves

[gchampoux]

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[mprabakar]

IF YOU CAN TRY TO FIX THE MIDPOINTS IN THE SHETCKING MODE OF THOSE
INDIVIDUAL CURVES AND SPLIT THEM INTO TWO IN THEIR SKETCH(HOPE YOU CAN
REDEFINE AND DO THIS NOW), THEN YOU CAN USE THE COMPOSITE CURVE OPTION
AND GET THE NEW CURVE WHICH YOU WOULD LIKE TO HAVE IN-BETWEEN THE
MIDPOINTS OF THE EARLIER CURVES.

HOPE THIS HELPS , IF I AM MIS-GUIDING ,PLS LET ME KNOW THE EXACT NEED.

REGARDS
PRABAKAR M

[jeff4136]

> I have a part with 2 curve features (complex splines).
> I need to create a new curve that is the mean/middle of the other 2.

[nbroc01]

Jeff,

You can define the mean of your curve with a point. Create a point on
curve with a length ratio of 0.5.

Regards,
-Nate

[jeff4136]

> You can define the mean of your curve with a point. Create a point on
curve with a length ratio of 0.5.

Regards,
-Nate

>>>>>>>>>>>

Thanks, Nate. The problem is (?) that there seems to be no "isocurve
extraction" function in Pro/E Foundation / Pro/Surface. ( ISDX?).

There is a "Make Isoline" function accessable via Heal Geometry / Manual,
but (1) doesn't do any good for native stuff and (2) I have yet to figure
out how to get it to do anything other than display where the curve / edge
would be created. If anyone can shed some light on how to get it to
actually create a curve or split the surface it would be helpful for
imported data, anyway.

Many thanks.....

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

[ptc-3962496]

Are your two reference curves planar?
(I don't have a plan at this point, but that might make a difference)

[brianadkins]

A mid curve can be accomplished with a variable section sweep surface
that uses both curves as trajectories. Just place the small ribbon
surface at the midpoint of the two curves in sketcher mode and that
ribbon surface will be swept along the midpoint of the two curves (with
respect to a specified pivot direction).

-Brian

[sip]

I don't know if I understand your original problem, you have 2 complex
curves running more or less side-by-side in your model, and you want to
make a curve that runs between them as an average, is that right? ( I'm
imagining something like a DNA spiral) How accurate do you need this to be?

What my thoughts were on this:
Create on-curve dtm points on both curves (the same ratios, you can link
them with relations) however many you need to make the curve run relatively
smooth and true between the curves.
Now you have two sets of dtm points across from each other on the curves.
Next, you can make point-to-point curves between each set of points. Now
you can make on-curve points at half ratio on each of these curves. now you
can run a curve by points, and pick each of these halfway points. That
should give you a curve that runs roughly between the two curves.
Let me know if I haven't understood correctly.

Sip Hofstede
Drafting Technician
Lehman Trikes, Inc.
(780) 349-3738
sip@lehman3.com
www.lehmantrikes.com

[brianadkins]

That is also how I interpreted the original question...

Attached is image of a VSS solution... Ribbon VSS surface running
between the two curves

-Brian

[BrentDrysdale]

The answers I have seen are very much like would try myself. I hope
they are of use to original poster (Sorry, identity lost as message
already deleted).

There is a small philosophical question however in why it is not
possible to directly create a datum curve using the full set of
construction techniques for surface, for example the VSS surface that
Brian Adkins shows. Over the years I have had to make extra features
like this then make a datum curve afterwards using the surface or use an
edge of the surface to create other geometry. I guess my point is that
it would be nice to keep datum curves as references for geometry
construction purposes instead of having to use surfaces. If nothing
else it is would be more tidy for layer control.

Off hand the extra functionality in Datum curve that would be useful are:

* Variable Section Sweep (recognising that you would only be
sweeping a point)
* Helical Sweep (recognising that you would only be sweeping a point)



Adkins Brian M wrote:

>
>
>That is also how I interpreted the original question...
>
>Attached is image of a VSS solution... Ribbon VSS surface running
>between the two curves
>
>-Brian
>
>
>

--

Regards, Brent Drysdale

Mechanical Designer

Tait Electronics Ltd

New Zealand

Ph. +64 3 358 1093