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Jay.Shah3-Newcomer
3-Newcomer
May 6, 2024
Question

Relations with constrained dimensions

  • May 6, 2024
  • 2 replies
  • 1935 views

I have a sketch of a quadrilateral between 2 parts in my assembly and the dimensions of this quadrilateral are derived from the spacing between the parts (by putting constraint "Point on Entity"). Now, I want to establish relations for placement of another part with the dimensions of this quadrilateral. However, when I enter into the relations dialogue box and click on the sketch, the dimensions corresponding to the lengths of the quadrilateral do not show up. I understand that this is happening because it was not a defined length, but rather a derived length. But is there a way to access such dimensions in the relations dialogue box?

2 replies

tbraxton
22-Sapphire II
tbraxton22-Sapphire II
22-Sapphire II
May 6, 2024

If I understand your verbal description correctly, you can use a reference dimension defined in your quadrilateral sketch in both part and assembly relations. 

 

Using Driven and Reference Dimensions in Relations (ptc.com)

 

If this is not a solution to your problem, then please post a screen shot of the sketch with constraints and dims shown and describe the modeling dependencies relevant to design intent.

J
Jay.Shah3-NewcomerAuthor
3-Newcomer
May 6, 2024

Thank you for your reply. This is exactly what I was referring to, but somehow I am not able to access that driven dimension in the relations box. I have attached a screenshot here in which the distance of a plane (d82:1) is supposed to be driven by the long length of the quadrilateral shown in the figure. That particular length does not appear when I click on that sketch or the extrude when defining the relation.

P
19-Tanzanite
pausob19-Tanzanite
19-Tanzanite
May 6, 2024

hmm, from your screenshot, it does make me wonder if the dimension would become visible if you first spun the view into an orientation where you could see all 4 edges of the quadrilateral, then clicked on the sketch or the extrude feature.

Because it seems you are viewing the quadrilateral sketch from the side - so a single line is showing (instead of expected 4)

I think Creo for some reason hides those dimensions that are in the plane orthogonal to the viewing direction.

A
anursinghCommunity Manager
Community Moderator
May 13, 2024

Hi @Jay.Shah,

 

I wanted to follow up with you on your post to see if your question has been answered. 
If so, please mark the appropriate reply as the Accepted Solution. 
Of course, if you have more to share on your issue, please let the Community know so that we can continue to help you. 

 

Thanks,
Anurag

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