Alignments over several stages

[[Fe...]]

Hello,

I am struggling with stages and the alignments of the parts over stages.

My experience is that if I create a new stage I need another alignments. This could be necessary.

But If I change between stages the parts are misaligned (of course because different actual part has different own alignment) and looks to me that I need to track/follow the proper alignment to the proper stages.

Am I right? Or I do some simple mistakes?

(I have reasonable experience with PolyWorks, but I do not remember such a problem. The alignments are connected to the specific stages and I do not needed to keep track what is going on with the alignments.)

(I know the real solution would be the scanning  the parts into the same coordinate system but I have no influence on that.)

By the way if you can suggest me a training resource I would be appreciate it. The ZEISS/GOM knowledge system is way too messy to me.

 

Thank you in advance

[[Aa...]]

What are you using for an initial alignment?

[[Be...]]

Hi,

according to Aaron it depends on your alignment: If you have created an initial alignment like the 'Prealignment' the software should try to calculate for this new stage the alignment again, individually from other stages. So, it's important that your initial alignment brings the data in each stage independently into the CAD coordinate system. In this alignment you should be able to construct some elements from nominal which can be used for better alignments (usually called 'Main alignment').

If you haven't used an initial alignment which could automatically be calculated the software asks you for each stage to redefine the so called interactive parameters. An example for this would be an alignment with three points where the points were clicked e.g. on the mesh.

Hope this helps?! Otherwise contact your local ZEISS partner for a recommendation which training could make sense.

Regards,

Bernd

 

[[Fe...]]

Sorry for late answer, but I have not too much chance to access a PRO version....

 

I have using initial alignment as 

Please sign in to view this quote.

I am using pre-alignment as initial alignment. (And works quite well on the first/inital stage)

I have tried to find an explanation or tutorial about stages but this area is poorly documented based on my experience.

Let's make step by step:

- I create a project, with cad, and the first scanned data. I make a initial alignment as pre-alignment. (Looks great maybe I want to refine later...))

- I try to add a second scanned part as stage. It is ok. The new stage has created, the new scanned surface has appeared into the workplace its original orientation.

- I try to  make an alignment on into the second stage, but gives me the error. I think because the first alignment blocks the second and vica versa. Why does even happen this? As I mentioned earlier I have no influence on the orientation of the scanning.  I think that scenario is really valid when I have different scan result with completely different orientation. Can I make alignment without connection between stages?

What I make wrong? 

Thank you for your advice in advance....

Ferenc

[[Aa...]]

Hi Ferenc,

The pre-alignment is capable of handling different orientations independently for each stage.  Perhaps the settings for the pre-alignment need to be changed?  In particular, the stage behavior mode setting hidden by the drop down arrow needs to be set to "Separate stage transformations".  If you take a screen shot of the Prealignment dialog window we could look it over here.  Screen shots of the scans are also helpful.