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dsondenaa1-Visitor
1-Visitor
December 10, 2019
Question

Datum Target Points in Merged Model

  • December 10, 2019
  • 6 replies
  • 5163 views

I'm working in CREO 4 and I have a casting model with datum target points defined in it and then I have an external merge setup for the machining model. I need to reference the datum target points from the casting model to establish my machining datums but I can't find out how to get these target points and datums to show.

 

Please help.

6 replies

S
SpinyNorman5-Regular Member
5-Regular Member
December 10, 2019

Assuming you have "point display" checked, when you regenerate the merge part the datum points should display.

Also check if the points are associated with a hidden layer.

D
dsondenaa1-VisitorAuthor
1-Visitor
December 10, 2019

That works to show the points but is there anyway to carry over the datum annotation feature and datums or do I have to recreate them in the machining model?

S
SpinyNorman5-Regular Member
5-Regular Member
December 10, 2019

Now I see what you want; as far as I can tell, yes you have to recreate them in the machining model

G
GaryLinscheid15-Moonstone
15-Moonstone
December 10, 2019

Have you tried making it an Inheritance instead of a merge?

D
dsondenaa1-VisitorAuthor
1-Visitor
December 10, 2019

I tried this but couldn't get it to work either.

 

I'm also not sure of the difference between the 2.

KenFarley
KenFarley21-Topaz II
21-Topaz II
December 10, 2019

If you bring in the casting model as a workpiece in the manufacturing assembly, doesn't it bring in the datum points you need, too?

D
dsondenaa1-VisitorAuthor
1-Visitor
December 10, 2019

The points carry over but the datum target annotations do not.

tbraxton
tbraxton22-Sapphire II
22-Sapphire II
December 10, 2019

Are the datum targets annotation features? If they are features then you should be able to use an inheritance feature to pass them from the source to the target model. I have not confirmed this (for annotation features) but inheritance allows for feature level control when passing to the target model. Annotation features did not exist when the inheritance was first implemented so they may not behave as other feature classes in this context.

 

One of the use cases for inheritance was specifically for cast/machined designs so it is useful for that. I have some data on the implementation of inheritance vs. merge functionality, I will post that when I dig it up.

 

 

Patriot_1776
Patriot_177622-Sapphire II
22-Sapphire II
December 18, 2019

I've seen a lot of problems in using layers with the use of Inheritance/Merge top-down methods.  I stopped using that technique for that reason.  What I do now is make a family table of cast generic, with machined instances.

 

I think you'll find that the points issue is layer-based.

 

Best of luck!

tbraxton
tbraxton22-Sapphire II
22-Sapphire II
December 19, 2019

This issue logged in PTC support database. Workaround is re-creating the Datum Tag in the inherited part.

 

Inherited Datum Feature Symbol cannot be selected as a Geometrical Tolerance datum reference with Creo 4.0  

 

Summary is:

 

  • Reported to R&D as SPR 7967632
  • Works to product specification for Creo Parametric
  • A change in functionality is being considered for a future release by Product Management but no timeline can be committed to at this time

 

P
Pettersson15-Moonstone
15-Moonstone
December 20, 2019

Copy Geometry can copy annotations from one model to another, so using that instead of, or in addition to, merge might be an idea. Unfortunately, playing around here I can only get the datum tag to follow, not the target markers. I'm on Creo 3 at the moment, though, and Creo 4 has revamped the way MBD works, so it might work on Creo 4. Or you could probably do it by using symbols instead of the "proper" datum target markers.

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