start alignment not working properly

[[Ni...]]

HI,

I have a question about base alignment and start alignment. There is this part that works perfectly fine when running it with the base alignment as shown. Doesn't scan the circles twice. No "air scanning" messages.



But if i do a start alignment with the same features just points instead of planes and 180° degree strategy instead of 360° for circles, the program doesnt run properly. It scans the circles two times due to "air scanning"
The measured points look like it was not making contact with the part.

The reason why i am using a 3d line for the planar rotation is to compensate for any parts that may be slightly skewed.

I would like to have a start alignment because its quicker to probe the part with Z down.
The base alignment uses X+ and X- for both circles which makes it longer.

The sensor is a passive XXT.


Thank You,
Nixon Uruchima

[[Ma...]]

Are you sure that 3d line have same nominal in Z as cylinder in BA?
Next step would be ensuring if 3d line is calculated correctly ( check nominal and actual radius of circles if you are using them for 3d line )

[[Ni...]]

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Its very possible on the actual program i am also using a 3d line. Sorry i am trying to recreate the alignment from memory.
But the 3d line and the cylinder are made up of the same circles at the same height on Z and same location on X.

[[Ha...]]

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Did you use the recall feature points option for the 3D line? If so, that would skew the feature's axis as it's trying to fit it to the actuals. The recall option is most appropriate here as it will use the centers of the circles to establish the 3D line's axis. Link to a KB article below with examples showing how the options affect 3d lines.

https://portal.zeiss.com/knowledge-base?id=1182601

[[Mi...]]

Those who are not resident in North America have unfortunately not access to the knowledge-base-portal (why?)
but some information can also be found under
https://carl-zeiss-industrial-metrology ... =145200876

I don't know if this is the same article, since the abovementioned restriction to North America residents.
Maybe someone who has access to both can confirm?

[[Ni...]]

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I always use recall for 3d lines.

[[Ma...]]

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I think Joseph meant to not use recall measured points.
Recalling from features is ok.

[[Ni...]]

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Sorry I meant that I did not use recall measured points. I used recall.
I was trying to say that I already did what he said to do.

[[Ni...]]

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Sorry I meant that I did not use recall measured points. I used recall.
I was trying to say that I already did what he said to do.

[[Cl...]]

I'd swap Cylnder1 and Plane3. The cylinder offers more wheelbase for a more stable alignment.