Length section curve

[Luca_Carraro]

I'm a mechanical design,

I need to measure a lenght of section curve.

Actually I work with PROE WF4 or CREO8

Why with a singolar measure, exact with geometrical calculate, is different of a measure with

section curve.

On example 2667.4601versus 3984.22.

Many thanks for the answer.

[pausob]

It is not clear what you are trying to do and your example images are identical.  So please explain again.

[Luca_Carraro]

Sorry, in the hurry,

there is two images with different mode to measure length.

[pausob]

Well, the basic answer is that either method should yield the same number.

e.g., I tried this in Creo4 and I get the same answer in both "modes":

So, from the information you provided, I am not sure what clue to give you about where things have gone strange.

And your pictures still don't quite make sense to me - in that you seem to have 2x the edges selected in the one-to-one example vs the one where the curve from cross section is measured; yet that analysis yields a smaller number?

[Luca_Carraro]

Hi,

made a  simplest part tested with Creo8.

The measure is made by directly selecting the feature from the tree.

[Luca_Carraro]

Hi,

part made with CREO4

[pausob]

So it seems Creo4 works as expected, but Creo8 gives you strange results?

I don't have Creo8, so I can't offer any further help.  You should reach out to PTC for technical support.

Sounds like a bug.

PS. still baffled as to why your "section" curves are "doubled up" like that;  typically I think of a section as a slice using a single plane.

Must be something specific to your designs?

[mf2001_98 · Accepted solution]

You have a feature with overlapping lines in your model.

Please check feature N° 18 named "EXTR_PASSATE" and delete all 3 overlapping lines in the sketch.

After that the measured length will be correct.

[Luca_Carraro]

Hi, mf2001_98,

thank you so much for your wit in finding the error. 

For "PAUSOB"

I need this to find the milling perimeter by simulating a constant Z path with a depth of pass of 4mm.

So I thought of making an "S" shaperd surface and intersecting the piece.

With a measurement feature that selects all the curve taking only a feature of intersec.

I obtain the perimeter and therefore the milling time.

Many thanks for your time, greeting Luca.

[pausob]

Ah, I see.  Interesting application of the modeling tools.  I suppose in the Creo8 model, instead of "S" curve, you inadvertently sketched a "figure 8" curve?

[Luca_Carraro]

Hi,

it is a series of "S" and inadvertently some lines have overlapped.

If I had enabled sketch diagnostics I would been notified.

Pratically I get some steps for the plates to be milled in contouring.

With this part I would like to have an estimate of the workings.

Many thanks for your time. Greetings Luca.