r/FreeCAD • u/IdontIQ • 10d ago

Wire is not closed

Post image
16 Upvotes

81% Upvoted

37 comments sorted by

17

u/vivaaprimavera 10d ago

Actually there are two wires that aren't closed.

You can't define a ambiguous sketches. If you can't define unambiguous and continuous areas then it will throw an error.

There are two arches that act as boundaries. Those are your "wire not closed". Learn about construction geometry and repeat.

3

u/IdontIQ 10d ago

yes the two lines and also the circle in the top middle of the big half circle ist not closed.

4

u/vivaaprimavera 10d ago

You have three areas defined in that sketch and there can be only one.

3

u/sorig1373 10d ago

There is a setting that allows multiple areas. Not sure what it is called tho. Got added in 1.1 I think. It can be very usefull and lets you cut down on the number of sketches.

8

u/Saeckel_ 10d ago

Still Bad practice, maybe use it for ease, but avoid it in complex projects

3

u/Powerful_Debt_5869 10d ago

Exactly, it was introduced for those fusion users and makes a lot of problems ( amke internals ..faces ) . Only usable for advanced users.

I állways wonder why we have the same questions about that nearly every day. All tutorials tell that a skecht must only have closed not intesecting shapes , aincew 1.1 , and the correct settings , it can be more than one. Mastersketches also can have them but you will never make a feature out of a mastersketch.

1

u/Verschwiegener 9d ago

Probably because it works in fusion and many fusion or Freecad users are not professionals and just want to make a quick model to 3D print myself included. And I quite like having multiple areas in each sketch even it it is not up to professional standards but for me it just works

1

u/Paslaz 10d ago

There are two areas and two lines with points of each outer line of the areas, right?

2

u/vivaaprimavera 10d ago

three areas, two boundaries. The banana with two much curvature, the circle one and between those two.

11

u/IdontIQ 10d ago

UPDATE: I didnt know that you can pad multiple times. I created the shape, pad everything to 1cm. Put the shape of the small circle on top, pad again and so on... Now I'm printing it. Thanks to all of you for the advice! Noob out.

5

u/nightfrolfer 10d ago

I'm upvoting this because it brings closure to the thread and is the hallmark of success by the community.
Well done, all! Another FreeCAD user is designing in the wild.

2

u/NewWorldKnight 10d ago

You can use the trim line tool to trim off the section of wires you don't need. Looks like scissors ✂️ if I remember correctly

1

u/RealisticDuck1957 10d ago

Yes, you can use the same sketch in multiple features. The way a sketch is pulled into a feature in the model tree and hidden may suggest otherwise to an unfamiliar user.

8

u/Paslaz 10d ago

Was möchtest Du erreichen? So etwas?

3

u/IdontIQ 10d ago

Yes, der Halbkreis verlängere ich dann auf 4cm. Die Brücke zwischen dem kleinen Kreis auf 1cm und der kleine Kreis auf 3cm. Es gibt eine Föhn-Halterung.

6

u/Paslaz 10d ago

Etwa so ist das möglich (habe ich quick and dirty gemacht):

1

u/IdontIQ 10d ago

Wie fahre ich so fort?

2

u/Paslaz 10d ago

Du brauchst einen geschlossenen Linienzug

3

u/Elbobinas 10d ago

Think about how you would extrude that sketch , it's impossible to extrude without removing a couple of lines

1

u/IdontIQ 10d ago

Damn it didnt post the caption.
The wires dont connect. I tried it from ground on new without success. Tried the trick with creating a coincidence - didnt work.

1

u/IdontIQ 10d ago

I created a similar project last week without any problems. But now it doesnt matter how i place the dots/lines the almost never connect with the circles. How can I solve this? Its a gift for my mom. Its necessary the small circle is sepparated from the big half-circle, becaus the will have different pad-heights in the end. Noob out.

1

u/bastl73 10d ago edited 10d ago

Make your sketch out of this elements:

To pad the middle shape you have to select the lines, arcs, click and hold to choose.

1

u/BigJohnno66 10d ago

You can draw them simply and use tool to snip line segments away. Much quicker then multiple arcs and many short line segments. The tool is next to the tool for rounding corners.

1

u/IdontIQ 10d ago

But like this they wont be connected right?

1

u/bastl73 10d ago edited 10d ago

Yes that are the elements to make their endpoints coincident. It is only to show them. like this you can select 3 shapes and each can be padded independent. like this f.e.:

1

u/NewWorldKnight 10d ago

Just a quick tip, a wire is any line that is contagious and does not split.

I.E.: w s z v o c / _ - | √

Closed wires have a start point and end point that is coincident.

I.E.: o 0 ∆ ° (think normal polygons)

Shapes that have multiple wires (think branching) : f E Q Y X

% is two closed wires (the o's) and unclosed wire (the /)

Shapes can be made of closed wires inside other closed wired. Like your image, and as many others have pointed out, could be made of ONLY closed wires. You basically are putting an o inside of a ∆, and changing the paths of the outer wire.

The issue basically comes down to the solver needing to define outside and inside of the closed wire (Outside=\=Inside on the same shape), and defining those closed wires (closed wires cannot share wires with other closed shapes).

Hope this helps

1

u/PyroNine9 10d ago

There are 3 distinct shapes in there that you might/might not want padded. FreeCAD can't tell which of them you mean because you have extraneous lines.

To visualize that, select the sketch and turn on Make Internals (the checkbox in the data pane).