How to subtract this loft to another?

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AstroUnicorn
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Joined: Wed Mar 10, 2021 10:52 pm

How to subtract this loft to another?

Post by AstroUnicorn »

I'm a beginner with FreeCAD (0.19, Fedora). After some research and video tutorials I managed to design my part, expect one last step.
I created 2 lofts, to represent the outside and the inside of what I call the tunnel.
I now need to subtract the inside shape to the outside shape to create a big whole.
I tried to use the cut or the boolean buttons, sometimes after converting my lofts to solids, but this always ends up with something not expected.
I attached my project file. Here is a view of what I want after playing with the visibility but I can't achieve the same in an exported STL file.
Attachments
project.FCStd
(74.57 KiB) Downloaded 13 times
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Shalmeneser
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Re: How to subtract this loft to another?

Post by Shalmeneser »

Lofts : Solid=true

Code: Select all

 ├ Cut (Cut)
 │  ├ TunnelOutside (Loft)
 │  │  ├ Face (Face)
 │  │  └ Face001 (Face)
 │  └ TunnelInside (Loft)
 │     ├ Face002 (Face)
 │     └ Face003 (Face)
Why do you need bodies and parts ?
Attachments
project_SHALM.FCStd
(79.39 KiB) Downloaded 18 times
Capture du 2022-01-21 23-57-52.png
Capture du 2022-01-21 23-57-52.png (44.55 KiB) Viewed 1317 times
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Shalmeneser
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Re: How to subtract this loft to another?

Post by Shalmeneser »

Code: Select all

 └ Body (Body)
    ├ Pad (Pad)
    │  └ Sketch (Sketch)
    ├ AdditiveLoft (AdditiveLoft)
    │  ├ Sketch (Sketch)
    │  └ Sketch001 (Sketch)
    └ Pad001 (Pad)
       └ Sketch002 (Sketch)
Attachments
Capture du 2022-01-22 00-10-28.png
Capture du 2022-01-22 00-10-28.png (29.41 KiB) Viewed 1309 times
project_SHALM2.FCStd
(54.33 KiB) Downloaded 18 times
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Shalmeneser
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Re: How to subtract this loft to another?

Post by Shalmeneser »

:idea:
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project_SHALM3.FCStd
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AstroUnicorn
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Joined: Wed Mar 10, 2021 10:52 pm

Re: How to subtract this loft to another?

Post by AstroUnicorn »

Many thanks Shalmeneser.
I know I shouldn't use multiple bodies but at my level that's the way I found to do more complex shapes.
Can you tell me what you did to my original file to get this result? (your first file)
I will take the time to have a deep look of your other files to understand how I should have done that.
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Shalmeneser
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Re: How to subtract this loft to another?

Post by Shalmeneser »

A loft in Part can be just a face or a solid.
Part create different solids and you need to fuse / cut / intersect them to get the resulting solid.

But 2 bodies and 1 part object do not give 1 object. You need to fuse them all. (Or select them all before export)
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