5 Replies Latest reply on Jul 11, 2016 6:54 PM by David Durston

Constrain sketch to a changing surface?

Timothy Gadzella Jul 11, 2016 1:35 PM

I'm relatively new to the program, but here's the basics: I've got a simple assembly with two posts at angles. I need to drop a hole through the top surface of each post, but I need to be able to change the angle of the post. I'm changing it by altering the parent sketch in the part - I was hoping the sketch would stay constrained to the surface in the assembly, but it looks like it's deleting the face and making a new one so the constraints all crash.

Is there another way I should be going about changing the post to avoid this problem?

Re: Constrain sketch to a changing surface?

Jose Lalic Jul 11, 2016 2:55 PM (in response to Timothy Gadzella)

Would you be able to post your file here?
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Re: Constrain sketch to a changing surface?

Glenn Schroeder Jul 11, 2016 3:08 PM (in response to Timothy Gadzella)

I'm not sure I'm following you either. Do you want the angle of the holes to remain constant relative to the assembly as the posts positions change?

As Jose said, it would probably help if you can Pack and Go the assembly to a zip folder and post it here. Or at least a screenshot. (See Forum Posting for directions on posting files and screenshots.)
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Re: Constrain sketch to a changing surface?

Tom dunn Jul 11, 2016 3:44 PM (in response to Timothy Gadzella)

i instead of changing the angle of the posts on the part level can you add a mate (angular mate) at the assembly level that controls the angle of the posts?
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Re: Constrain sketch to a changing surface?

Timothy Gadzella Jul 11, 2016 4:38 PM (in response to Timothy Gadzella)
Hi guys,
Tom (^) is actually pretty close to what I'm asking, but I actually need to put a mitre on the end of each post.
Because of the IP status, I can't post the full assembly but I did isolate the parts I'm struggling with. Unfortunately it means that the concentric constraint is also doing something weird...
Anyways, if you guys can help me with the angle-changing thing I can work out the rest.

Post_assembly.zip 367.2 KB
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Re: Constrain sketch to a changing surface?

David Durston Jul 11, 2016 6:54 PM (in response to Timothy Gadzella)

Timothy,

I deleted the vertical relation from within 'Sketch2' (part of 'Cut-Extrude1'). This allowed the sketch to find a solution.
I could then edit the sketch that created the post and the hole stayed in the post and concentric to the hole in the plate.

David
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