Fully constrained sketch, wire not closed ? [solved]

Post here for help on using FreeCAD's graphical user interface (GUI).
Forum rules
and Helpful information
IMPORTANT: Please click here and read this first, before asking for help

Also, be nice to others! Read the FreeCAD code of conduct!
Post Reply
User avatar
FredCailloux
Posts: 52
Joined: Wed Jul 14, 2021 7:37 pm
Location: Canada

Fully constrained sketch, wire not closed ? [solved]

Post by FredCailloux »

I have this, not so complicated, sketch from which I get an error when trying to PAD .

The sketch is fully constrained and yet FreeCAD complain that the "Wire is not closed".
Questions:
1- Is it possible to have a fully constrained sketch with un-closed wires ?
2- How can I find where the problem is ?
Attachments
WireNotClosedSKT.png
WireNotClosedSKT.png (14.16 KiB) Viewed 1532 times
WireNotClosed.png
WireNotClosed.png (21.5 KiB) Viewed 1532 times
Last edited by FredCailloux on Mon Jan 30, 2023 5:39 pm, edited 2 times in total.
Great results only comes with great understanding. Great memory is just an illusion.
User avatar
NewJoker
Veteran
Posts: 3016
Joined: Sun Oct 11, 2020 7:49 pm

Re: Fully constrained sketch, wire not closed ?

Post by NewJoker »

Try using the Sketcher ValidateSketch tool. Can you share the file ?
drmacro
Veteran
Posts: 8864
Joined: Sun Mar 02, 2014 4:35 pm

Re: Fully constrained sketch, wire not closed ?

Post by drmacro »

There is a bit of misconception about the state "fully constrained". It really means all DOF's have a constraint applied and there are no redundant, over constraints, etc. situations. It does not imply the shape won't change or that it is considered closed.

To be considered closed all coincident vertexes must be marked coincident. Physical proximity does not imply coincident. And grid snap does not add coincident constraints.

You can deactivate a few geometric or dimensional constraints and wiggle the edges until you find the vertexes that aren't coincident.

You can also close the sketch and use the Validate sketch tool to find them.

You can also begin using polyline, trim, etc tools that automatically add coincident constraints to avoid the issue.
Star Trek II: The Wrath of Khan: Spock: "...His pattern indicates two-dimensional thinking."
chrisb
Veteran
Posts: 53919
Joined: Tue Mar 17, 2015 9:14 am

Re: Fully constrained sketch, wire not closed ?

Post by chrisb »

From what we have seen in the past, it is well possible that you have additional elements doubling the visible ones.
A Sketcher Lecture with in-depth information is available in English, auf Deutsch, en français, en español.
User avatar
Shalmeneser
Veteran
Posts: 9474
Joined: Wed Dec 23, 2020 12:04 am
Location: Fr

Re: Fully constrained sketch, wire not closed ?

Post by Shalmeneser »

A solution : do multiple but simple sketches instead of just complex one.
User avatar
papyblaise
Veteran
Posts: 7866
Joined: Thu Jun 13, 2019 4:28 pm
Location: France

Re: Fully constrained sketch, wire not closed ?

Post by papyblaise »

it's still a crystal ball enigma: without a file how do you want us to do
User avatar
Shalmeneser
Veteran
Posts: 9474
Joined: Wed Dec 23, 2020 12:04 am
Location: Fr

Re: Fully constrained sketch, wire not closed ?

Post by Shalmeneser »

:idea:
Attachments
WireTapping_SHALM.FCStd
(60.97 KiB) Downloaded 24 times
Annotation 2023-01-30 121153.jpg
Annotation 2023-01-30 121153.jpg (28.56 KiB) Viewed 1231 times
Annotation 2023-01-30 121225.jpg
Annotation 2023-01-30 121225.jpg (34.32 KiB) Viewed 1231 times
User avatar
FredCailloux
Posts: 52
Joined: Wed Jul 14, 2021 7:37 pm
Location: Canada

Re: Fully constrained sketch, wire not closed ? (solved)

Post by FredCailloux »

Shalmeneser wrote: Mon Jan 30, 2023 11:14 am:idea:
Thanks for this tutorial. Very helpful.
It shows me a much more intuitive method of doing things... step by step with simpler sketches.
I will change my method for now on. Much appreciated.
Great results only comes with great understanding. Great memory is just an illusion.
User avatar
Shalmeneser
Veteran
Posts: 9474
Joined: Wed Dec 23, 2020 12:04 am
Location: Fr

Re: Fully constrained sketch, wire not closed ? [solved]

Post by Shalmeneser »

Simple sketches are less prone to TNP when refered.
Post Reply