Welcome to the Onshape forum! Ask questions and join in the discussions about everything Onshape.
First time visiting? Here are some places to start:- Looking for a certain topic? Check out the categories filter or use Search (upper right).
- Need support? Ask a question to our Community Support category.
- Please submit support tickets for bugs but you can request improvements in the Product Feedback category.
- Be respectful, on topic and if you see a problem, Flag it.
If you would like to contact our Community Manager personally, feel free to send a private message or an email.
Options
Constraints are not stable.
lloyd_snell
Member Posts: 23 PRO
in Drawings
I am always redoing constraints between a casting part model and the related machining part file. I bet I have replaced the same constraints a hundred times. Enough so, I am looking for answers. For instance, I have a revolved surface and the edges of the surface are constrained to a face of the casting. Everytime I add a feature, or change a feature in the model, not even related to the define constraint it is lost. Example two, when adding drilled and tapped holes in the machining model you place points and constrain them to arc and circle that are raised bosses. By simply adding a fillet to the boss in the model the reference is broken. Change, remove the radius the reference is lost.
Parametric relationships are explosive and easily disrupted it seems. What am I missing? Reference, definitely not as stable as Creo, but Creo has a 25 yr head start.
Parametric relationships are explosive and easily disrupted it seems. What am I missing? Reference, definitely not as stable as Creo, but Creo has a 25 yr head start.
Tagged:
0
Comments
In any parametric modeller, if you remove a reference like adding a fillet to an edge, the edge no longer exists so your hole locations will no longer have a reference. This is the same behaviour in Creo, SolidWorks, etc. If you add the fillet after the hole everything is fine as the hole locations would have been resolved before the edge disappears.
If you can share more detail related to "revolved surface and the edges of the surface are constrained to a face of the casting. Everytime I add a feature, or change a feature in the model, not even related to the define constraint it is lost", I can help to explain why.
Thanks.