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rory_hawkins1-Visitor
1-Visitor
April 11, 2022
Question

Repeated reference pattern issue

  • April 11, 2022
  • 1 reply
  • 3125 views

I'm having an issue with performing repeated patterns on a quilt.  Unfortunately I can't share much due to confidentiality so will have to do my best to describe.

 

I'm starting with a 'base/origin' quilt on which I perform a number of patterned merges.  Usually I model another quilt which is to be merged, copy that quilt, pattern the copy, merge the first copy with the base quilt (ensuring the base quilt is selected first), select that merge feature and select pattern which would automatically detect the previous pattern and do a reference pattern of the merge.

 

However on this particular model this works once but when I try and do it a second time, the pattern feature button is either greyed out or the pattern instances are overlaid in a single point (seems to vary when I've fiddled around to get around the problem). If I create a copy of the base/original quilt and merge with this instead, the second reference pattern works fine (as do subsequent patterns but a copy of the base/original quilt is required each time) but there are fairly major disadvantages to not being able to carry a single quilt/feature reference through the design process.

 

From what I've managed to find by googling there seems to historically have been some issues/bugs with reference patterning. My general understanding is Creo sometimes struggles with which previous pattern to reference if there are multiples.
Is anyone able to clarify this for me? Is there a reliable way of making it clear/isolating which pattern is to be referenced? Any help would be greatly appreciated.

1 reply

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
April 11, 2022

While your verbal description is readable, it is difficult to root cause the problem without a sample data set for evaluation. Can you create a simplified set of model(s) that demonstrate the problem and post them?

 

Are geometry patterns possibly the right tool to implement what you are trying to do? That is something to explore. The other issue that may be relevant here is that when you merge quilts the internal feature IDs may be getting updated and that can cause reference problems. Does your base quilt have multiple patches within it? You should be able to use the global reference viewer to gain insight into the references before and after your attempt to pattern to see what is happening.

R
rory_hawkins1-VisitorAuthor
1-Visitor
April 12, 2022

The attached is analogous to my part.  For some reason I can't do a reference pattern on the last merge feature (F24).  Nothing terribly complicated.  Can't understand why.  Thanks for your help.

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
April 12, 2022

If you are not aware of how Creo splits circles in half and the ramifications of this, I would encourage you to research this. It will cause problems on parts with cylindrical geometry and since you are modeling surfaces in the example the cylinder split can cause reference problems with features that cross over the split or straddle the split.

 

Your feature #17 straddles the split of the cylinder in your posted model. I suspect this is probably the issue but I am not positive.

 

I do not have a specific root cause for why you can not create the reference pattern as you wish. It would take a while for me to dig through the references so I just modified the model to get the desired pattern members generated and then created a reference pattern after that on the opposite side of the cylinder to show it can be made more robust with geometry patterns.

 

Do not take the use of the last axis pattern as best practice for an axis pattern, I added it to demonstrate you can create a reference pattern from the opposite cuts.

 

Creo 7 model enclosed for reference. Note the structure in the model tree and the use of a group as the pattern leader for your horizontal cuts in the cylinder. If this approach does not enable you to create the pattern you need, I will need some more information.

 

tbraxton_1-1649797621897.png

 

 

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