NX - big failure 13

[NikonF6]

a new plane is created, say 80 deg to x-y plane, and passing through x-axis (zero distance form x-axis).
A sketch is made in that new plane.
Later on the plane is rotated, say 20 deg, more from x-y plane, so it pass x-z plane.
The sketch flips without role, all other things connected to that sketch gone too, ...


Resultant vector = All works, months spent, has to be redone, business lost due to time, ...

This additional rotation should be very simple operation within any software, however NX canNOT do it.
No further comment needed.

 

[mmauldin]

It doesn't take much to recreate this problem, I was able to on the first try with a pretty simple sketch. In the attached file, changing Datum Plane (10) from 80 to 100 causes the sketch to invert and the resulting extrude to fail.

Any thoughts on how to prevent?

NX 7.5.3.3

 

[mmauldin]

I went back and re-associated the .800 dim in the sketch to the Y-Z plane, rather than to the Z axis. This seems to fix the issue. Maybe avoiding attaching a perpendicular dimensions to a datum axis will help.

 

[PrintScaffold]

I went back and re-associated the .800 dim in the sketch to the Y-Z plane, rather than to the Z axis. This seems to fix the issue. Maybe avoiding attaching a perpendicular dimensions to a datum axis will help.

You practically answered your own question. Not creating outside reference when you don't really need one helps greatly. Personally, when I create a sketch, the first thing I do is make sure that Selection Scope is set to "Within active sketch only". This became a habit, and I really have very few problems with sketches.

http://www.cadroad.com

 

[PrintScaffold]

1. Flipping sketch shall not be a part of professional and high-end program. I expect from a such program to free me from software problems and my concentration should be on the engineering problems.
2. I am not professional internet guy with thousands of posts and hours, I am neither so familiar for the procedure to get a picture on this forum. I am looking to spend smallest possible amount of time on internet. as and I am looking for a bit of good help if can find.
3. I am very selective on accepting advices, especially when I sniff that a young is around. Their advices I do not need no matter good or bad.
4. Thank you for your advice about the coordinate system, it might works for me (it did not flip the sketch).

It was actually me who gave you the advice about CSYS.

Sketch flipping is not a part of NX per se. It is wrong use of NX that might give you that effect. But it is the case with ANY software - if you don't know how to use it, you will get errors every time. As you might have noticed, when used properly, NX is well capable of giving you the correct answer.

http://www.cadroad.com

 

[ewh]

I am very selective on accepting advices, especially when I sniff that a young is around. Their advices I do not need no matter good or bad.

Your loss. A fresh perspective on more efficient methods to use the software should always be appreciated. A young user may not have the drafting or design experience that you do, but may learn how to best use the tools given better than someone who is stuck in methods that have always worked for them in the past.

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV

 

[looslib]

“None so blind as those that will not see.”
Matthew Henry (1662-1714)


"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli

 

[cowski]

But if will end-up, that way, with so many coordinate systems covering each other.

Note that if the datum csys is only used for the sketch, you can make it "internal" to the sketch. This will remove it from view and the feature tree until you need to edit it or use the "make datums external" command.

www.nxjournaling.com

 

[man2007]

We always used "2 Line method" to create any sketch.
Create 2 lines (basically x and y axes) that are perpendicular to each other, position them and fully constrain them, and then constrain your sketch w.r.t. these 2 lines. With this, we can avoid referring more than two references for a sketch.
As someone pointed out, there are always better ways to use software while designing your product, it is just a matter of adapting such better methods.

And if we are dealing with angles or lengths that flip on either side of a reference/line, we are likely to end up in mess. In such cases, we should create a Dummy reference that will allow "change of angle/length" in Only One Direction! For example, if we need a line that changes to either 70 and 100 degrees, then refer a line at 60 degrees instead of a line at 90 degrees.

 

[PrintScaffold]

The moral of the story is...

perform frequent tests on your model!

http://www.cadroad.com