Another broken face error

[mbollinger]

Hello Forum,

Like many others who have posted on this topic, I am a new user. I am trying to pocket the logo of my agency on some 3D printed parts we're designing. I am struggling with the dreaded broken face error. I've gone through many posts on this same topic in the forum and I *think* my part is closed and am baffled as to why I am still getting this error. I've gone through the sketch validation and fixed any issues there as well. I've dragged each segment around and they seem to be connected.

My end goal of this part of the project would be to copy a functioning sketch onto the body of the other parts I'm designing. Hopefully that's doable but need to work through this error first.

This logo is made up of mostly b-spline segments except for the line segments I added manually to try to get it to not be broken. Is there an issue with b-spline segments not connecting with each other?

What am I missing? Thanks for any help.

Version info:
OS: Windows 10 Version 1909
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/United States (en_US)

[GeneFC]

I have no idea why you used so many bsplines instead of simple arcs, but in any case here is where the problem lies. The sketch validator identified those points. I dragged the two points to show where the error lies.

Solution is left as an exercise for the student.

Capture.JPG (57.47 KiB) Viewed 927 times

Gene

[mbollinger]

Thank you for your help, Gene.

I would never had designed that with so many b-splines... The logo was an attempt at importing an SVG using the workflow described here: https://www.youtube.com/watch?v=BvEud4PDCRU

I went through the "O" issues that you defined above and deleted the line. I also went in and manually replaced the b-splines with arcs since you kind of hinted at that. I made sure that each of the start and ends of the arcs/lines line up. Again, it passes the sketch validation on my end, but will not Pad or Pocket with the error "Failed to validate broken face".

I've attached the project again with the arc/bspline replacements and the passed validation. Any ideas at this point?
Thanks,
Mike

[Shalmeneser]

Sketcher_ValidateSketch

[Shalmeneser]

Try to suppress some forms. If you suppress the text, it's ok.

(the problem is : line inside line inside line : illegal (hole in O))

You should work in 3 separate sketches with bird and text.

[TheMarkster]

Delete BSplines 83 and 80:

Snip macro screenshot-80fdd5.png (133.65 KiB) Viewed 829 times

But even after doing this Part Design will struggle with this sketch, perhaps because of the nested wires. (At least it struggles on my computer. I had to force close after trying to do the pocket.) Drag the sketch out of the body and go to Part workbench. Extrude the sketch, then cut it from the Body. Select the Body in the tree view, then the extrude, and do the boolean cut in Part workbench.

Snip macro screenshot-d45ed3.png (88.38 KiB) Viewed 829 times

You should also detach the sketch from xy_plane001 since it's no longer inside the body to avoid out of scope warnings.

[chrisb]

Again, it passes the sketch validation on my end, but will not Pad or Pocket with the error "Failed to validate broken face".

ValidateSketch doesn't do anything on its own. You should use the buttons for missing coincidences, possibly with increased tolerance and you should "Highlight troublesome vertices" which shows you two unconnected ends:

SnipScreenshot-ab2ad4.png (13.84 KiB) Viewed 780 times

But even if you fix this, it will not pad, because you can have only one level of nesting. So you will have to split the sketch in two, one with the wavy shape for a pocket, and one with the letters for again a pad.

[chrisb]

This is what I proposed above:

SnipScreenshot-2eeca9.png (29.87 KiB) Viewed 771 times

[GeneFC]

But even if you fix this, it will not pad, because you can have only one level of nesting. So you will have to split the sketch in two, one with the wavy shape for a pocket, and one with the letters for again a pad.

I missed that.

If you delete the upper portion of the circle the (repaired) letters work fine.

Gene