View source for FreeCAD/C3/Fixing-the-Wire-is-not-Closed-Error/English

'''Title of the script: Fixing the Wire is not Closed Error in FreeCAD'''

'''Author: '''Chitra Balaji.

'''Keywords:''' FreeCAD, Missing coincidence, Validate Sketch tool, Pad tool, Overlapping lines, video tutorial.


{|border=1
|- 
|| '''Visual Cue'''
|| '''Narration'''
|-
|| '''Slide 1'''

'''Title Slide'''
|| Welcome to this Spoken Tutorial on''' Fixing the Wire is not Closed Error '''in''' FreeCAD'''.
|- 
|| '''Slide 2'''

'''Learning Objectives'''
|| In this tutorial, we will learn to:
* Understand the wire is not closed error in''' FreeCAD'''.
* Identify gaps or overlapping lines in a sketch using the '''Validate sketch''' tool.
* Fix the error and pad the sketch.
|- 
|| '''Slide 3'''

'''System Requirements'''
|| To record this tutorial, I am using:
* '''Windows 11''' and
* '''FreeCAD version 1.0.0'''
|- 
|| '''Slide 4'''

'''Prerequisite'''
|| To follow this tutorial, 
* Learners should have basic knowledge of the '''FreeCAD''' interface.
|- 
|| Right click on the Freecad app image, Select Run.
|| Let’s open the '''FreeCAD''' interface.
|- 
|| Click on '''File '''menu select the new option

Go to '''File''' and click '''New'''.
|| Let us open a new file.
|- 
|| Switch to Part Design Workbench.

Click on the Create sketch tool 

Under the Tasks panel, Select attachment as XY-plane and click OK.

|| Let us select '''Part Design''' Workbench.Then click the''' Create Sketch '''tool.

Under the '''Tasks''' panel, '''Select attachment''' as '''XY-plane''' and click '''OK'''.
|- 
|| Rectangle tool highlighted in Sketcher.

Select one corner and drag the mouse

Press Esc key to deselect the Rectangle tool.

Or Right-click on the interface.

Highlight the red corner points.
|| In the sketch, select the''' Rectangle''' tool.

Draw a rectangle.

Press '''Esc''' key to deselect the '''Rectangle''' tool.

Let's trigger the wire is not closed error by deleting one coincidence constraint.
|- 
|| '''Constraints '''panel shows the constraint coincidences selected. 

(Constraints 1, Constraints 2, Constraints 3 etc,.)

Press the Delete key on the Keyboard.

Highlight the corner points
|| Select one Coincidence constraint from the left panel.

Press the '''Delete '''key on the keyboard.

Notice that the rectangle’s corner point turns from red to white colour.

Now the lines connecting the endpoint are free to move.
|- 
|| Zoom in the corners of the rectangle using the mouse wheel.

Highlight the lines

Press the endpoint of the line and Move the line

Zoom the sketch using mouse

Click on the endpoint where the white dot appears and move little.
|| Zoom in to see the endpoints of the lines.

Click on one of the endpoints.

Move it slightly so that the endpoints no longer meet.
|-
|| Click the close button on the left panel 

Pad tool seen in part design pad 

Pad tool highlighted

Click ok

Error message is displayed

Click ok on the message

Click the Cancel button on the left side to cancel the padding.
|| Close the sketch.

Click the '''Pad''' tool.

Pad parameters box opens. 

Click '''OK'''.

'''Input error''' message, '''Wire is not closed ''' appears and the sketch is not padded.

Click '''OK''' in the pop-up message.

Click the '''Cancel '''button in the left panel to cancel the padding.
|-
|| Click the '''model tab''' under the model tree.

Click the sketch

Click on the '''Validate Sketch Tool '''on the '''tool bar.'''

'''Sketcher validation''' dialog box opens.

Click '''Highlight Troublesome Vertices'''

Point to the highlighted disconnected endpoints.

Zoom the sketch using mouse
|| To fix this error, select the''' sketch''' in the '''Model '''tree.

Click on the '''Validate Sketch Tool '''on the tool bar.

'''Sketcher validation''' dialog box opens in the left panel.

Click '''Highlight Troublesome Vertices.'''

This will highlight the disconnected endpoints.

This tool helps to check for gaps, overlaps, and other geometry errors.
|-
|| Click on Missing Coincidences and click find

Tolerance box is highlighted

Select the value in the dropdown box

Click on the Find button.

Click Fix Button.

Click ok

Highlight the fix button

Zoom to see the endpoints
|| Under''' Missing coincidences, '''

Select the tolerance value as 0.01.

Tolerance defines how close two vertices must be to count as coincident.

Click on the '''Find''' button.

If the '''Fix''' button is active, click on it to reconnect the endpoints.

Then Click '''OK.'''

In some cases, the fix button is not active as shown.

This is because the distance between the two points should be less than the tolerance value for the '''Fix''' tool to work.

In that case fixing the endpoints has to be done manually.
|-
|| Click '''Highlight Troublesome Vertices.'''

Show the highlighted points.

Go to sketch

Click the '''Coincidence''' constraint icon from the toolbar.
|| Click '''Highlight Troublesome Vertices.'''

This will highlight the disconnected endpoints.

Note the highlighted points.

Click on Close

Go to sketch

select the two points that need to be joined.

Click the '''Coincidence''' constraint icon from the toolbar.

Note that the points are connected.

Click on Close 
|-
|| Click the Pad tool from the tool bar.

Click OK button
|| Now lets select the '''Pad''' tool.

Click the OK button.

We can see the sketch is padded now.
|-
|| Another common 'wire is not closed' error is caused by overlapping lines. 

Lets do that in assignment
|-
|| '''Slide 5'''

'''Summary'''

In this tutorial, we have learnt to:
* Understand the '''Wire is not closed '''error in FreeCAD.
* Identify gaps or overlapping lines in a sketch using the '''Validate sketch''' tool
* Fix the error and pad the sketch.
|| With this, we come to the end of this tutorial.

Let us summarize.
|-
|| '''Slide 6'''

'''Assignment'''

In Sketcher, draw a rectangle.

Add a line over one rectangle edge.

Close the sketch and try padding.

If an error occurs, reopen the sketch.

Use Validate Sketch tool to find overlaps.

Delete the extra line and close sketch.

Check if padding works.
|| As an assignment, please do the following:
|-
|| '''Slide 7'''

'''Thank you '''
|| Thank you for joining.
|-
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