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Mirror feature acting strange in combination with unbending

Jeroen
1-Newbie

Mirror feature acting strange in combination with unbending

Yet another questing concerning my parametric saddle... (for pressure vessels)

I can now unbend the saddle plate without a problem (IF I create the unbend feature BEFORE I start altering parameters, see other topic).

I can now create markings on the saddle plate that keep their position when unbending (see other topic, thank you Antonius!)

Because I need many markings on the saddle plate (the RED plate in the screenshots below), I tried to draw the lines (=projection of a sketch in the surface of the plate) on 1 side of the saddle plate, group all these projections, and then mirror this group.

I drew the lines on the left side of the screenshot, the mirror feature mirrors the lines to the right side.

It seemed everything went fine in the beginning.

Example for a cylindrical shell: (screenshot of the flat state pasted on top of the drawing)

Cylinder.png

Example for a conical shell: (screenshot of the flat state pasted on top of the drawing)

NormCone.png

Example for an eccentric conical shell: (screenshot of the flat state pasted on top of the drawing)

EccCone.png

As you can see, the mirror feature for the cylindrical and conical shell works like a charm.

The mirror feature for the eccentric cone is not correct.

Would this be a bug in Creo, or do I use this feature in the wrong way?


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8 REPLIES 8
Dale_Rosema
22-Sapphire I
(To:Jeroen)

From a lot of things that I have seen with mirror, you are better off creating separate parts. If you update the original, the mirror does not always update correctly.

TomD.inPDX
17-Peridot
(To:Jeroen)

Was this using the save-as mirror? Regardless if it is independent or not? Saved-as individually (parts rather than assembly)? Please explain how the part was mirrored.

Regardless, this is certainly one for the developers to look at.

Hi,

It isn't a mirrored copy of a part. That we have done for the green ribs. Until now we didn't had any problems concerning that part.

This is a mirror of a feature in a part. This is the tree, not from the complete set of lines. There are up to 72 lines in total needed. It would be very convenient to have to draw 'only' 36 lines, and then mirror them. Especially because every projection needs 2 datumplanes and 2 datumpoints and a sketch to create.

Tree.png

TomD.inPDX
17-Peridot
(To:Jeroen)

Okay, I thought the problem was with the geometry. I might suggest that the mirror is working perfectly and that something is slightly askew with your projection method.

As I noted before when making the saddle; datums seem to be dynamic between the bent and unbent stated. Datums created in the flat state "move" in the folder state. I suspect something like this is happening to your part.

Is there a clever way in which you can pattern your projections instead creating each one?

I've tried several things to use a pattern, but I think it's not possible. There are too many steps to take for each projection.

The projection itself would be much easier if I coul just project the centerline to the surface, but there I get the error that the distance between the sketch and the surface is way to big.

But to get back to the mirror-issue. I tried several things in the mean time, and I did notice something.

- for the cylinder, the mirror is 'easy': it is straight.

- for the cone, the mirror follows the cruvature of the unbent part without a problem.

- for the eccentric cone, the mirror seems to do the right thing, but to the wrong direction.

The flat state of the eccentric cone will always be an U-like shape. But the lines make a ~-like shape. I'll post a close-up in the morning.

TomD.inPDX
17-Peridot
(To:Jeroen)

There is a lot going on in the background with sheetmetal. You might just send this to CS anyway just to have them look at it.

Dale is right that mirror seems to have a lot of bugs but nothing will be fixed if they don't investigate. Your application is very logical and should function normally or someone needs to explain why not.

As promised the screenshot:

EccCone_side.png

It seems the mirror follows the correct curve, but in the wrong direction.

How do I send this to CS to be investigated?

TomD.inPDX
17-Peridot
(To:Jeroen)

Just fill out a form here:

https://www.ptc.com/appserver/cs/case/case_logger.jsp

You will need an SCN #, Service Contract Number which your administrator should be able to provide.

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