Part Design error in boolean operation (fuse)

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stern85F
Posts: 2
Joined: Mon May 29, 2023 7:51 am

Part Design error in boolean operation (fuse)

Post by stern85F »

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.2.29603 (Git)
Build type: Release
Branch: releases/FreeCAD-0-20
Hash: 930dd9a76203a3260b1e6256c70c1c3cad8c5cb8
Python 3.8.10, Qt 5.15.2, Coin 4.0.1, Vtk 8.2.0, OCC 7.6.3
Locale: Italian/Italy (it_IT)

The problem is described in the following images

In Part Design, trying the boolean fusion operation between the two bodies, separated from each other, of the figure
1.png
1.png (117.02 KiB) Viewed 518 times


I have as a result of the fusion the only active body.
2.png
2.png (107.69 KiB) Viewed 518 times


I think the explanation is in the following documentation:
https://wiki.freecad.org/PartDesign_Bod ... uous_solid
where it is written that “A PartDesign Body is intended to model a single contiguous solid. The meaning of "contiguous" is an element made in one piece, with no moving parts, or disconnected solids.”

However in the following tutorial:
https://www.youtube.com/watch?v=Y9l1zYnMj4g
we see how the fusion between the two bodies produces a body with both solids separated
3.png
3.png (486.91 KiB) Viewed 518 times
4-5.png
4-5.png (368.02 KiB) Viewed 518 times



Am I doing something wrong?
Attachments
Prova 3 FEM.zip
(20.54 KiB) Downloaded 6 times
GeneFC
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Re: Part Design error in boolean operation (fuse)

Post by GeneFC »

stern85F wrote: Mon May 29, 2023 10:55 am Am I doing something wrong?
Yes, you are watching a 5 or 6 year-old video. I believe the "fusion" was done in something other than Part Design, perhaps Part WB. (The video is pretty blurred.)

You cannot have two separate solids in a single Part Design body.

Gene
stern85F
Posts: 2
Joined: Mon May 29, 2023 7:51 am

Re: Part Design error in boolean operation (fuse)

Post by stern85F »

Thanks for the reply.
I also thought the same way, ie that he did the fusion in Part WB, but I captured the frame before pressing the [Boolen Fusion] button and it turns out to be in Part Desig WB. See following image.
6.png
6.png (411.28 KiB) Viewed 439 times
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Shalmeneser
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Re: Part Design error in boolean operation (fuse)

Post by Shalmeneser »

Please do not zip a FCStd file, it's already a zip file (you can open it to see different files).
Attachments
Prova 3 FEM.FCStd
your file unzipped
(23.04 KiB) Downloaded 5 times
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Shalmeneser
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Re: Part Design error in boolean operation (fuse)

Post by Shalmeneser »

GeneFC wrote: Mon May 29, 2023 12:53 pm I believe the "fusion" was done in something other than Part Design, perhaps Part WB.
I think he has buttons/features from Part wb inside PartDesign wb :
* he has three boolean operation icons in the menu (and twice the same)
* PD wb has only one icon
* PART wb has the button with blue and white part : Part_Cut
* the PD boolean operation doesn't work like that, but PART fuse does.

So this button is from Part wb. 8-)
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