Sheet Metal Workbench

Here's the place for discussion related to coding in FreeCAD, C++ or Python. Design, interfaces and structures.
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shaise
Posts: 158
Joined: Thu Jun 11, 2015 8:11 am

Re: Sheet Metal Workbench

Postby shaise » Thu Mar 09, 2017 5:16 pm

Ahh understood!
you are talking about a single face split into two parts, causing a "double" bend.
The way to fix it is to select OpenSCAD work bench, make sure the part is selected, and click the "refine" button. this should fuse the 2 faces making it one, and you can continue bending as usual.
As a side note, if you have symmetric bends, such as the 2 sides of the U you can select the 2 faces you want to have a bend, and add both bends at once. (instead of bending one side then the other)
Statik
Posts: 6
Joined: Fri Jun 03, 2016 5:31 pm

Re: Sheet Metal Workbench

Postby Statik » Thu Mar 09, 2017 6:04 pm

Yes, that's exactly what I was referring to. Thanks!
For reference, I learned Solid Works two years ago as part of my Engineering course and I designed a multitool as part of the course. I built the following part but used fillets to mimic bends as we didn't learn the sheetmetal folding portion. Since I run Linux as my daily driver, I wanted to recreate the part in freecad so that I could unfold the model and have it cut.
Handle - Handle.pdf
(55.9 KiB) Downloaded 20 times

It is rather complicated so I'm learning how to make it work in Freecad

Statik
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shaise
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Re: Sheet Metal Workbench

Postby shaise » Thu Mar 09, 2017 6:10 pm

Nice!
Good luck, and share a photo when you finish.
Statik
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Joined: Fri Jun 03, 2016 5:31 pm

Re: Sheet Metal Workbench

Postby Statik » Thu Mar 09, 2017 6:51 pm

Sheet Metal apparently doesn't like me making cuts to bends. :(
It is such a complicated shape. I wish there was a way to create the outline and then add fold lines. Then I could tweak the parameters until the final product looked correct.
Attachments
Handle_3.fcstd
(191.83 KiB) Downloaded 9 times
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shaise
Posts: 158
Joined: Thu Jun 11, 2015 8:11 am

Re: Sheet Metal Workbench

Postby shaise » Thu Mar 09, 2017 8:19 pm

Statik wrote:Sheet Metal apparently doesn't like me making cuts to bends. :(

if you are talking about cutting Extrude006 from Bend009, it worked for me.
bendcut.png
bendcut.png (54.4 KiB) Viewed 145 times

Regardless of that, I see that each time you want to cut, you create a sketch, extrude it, then use "Boolean cut" to cut it.
A simpler way is to go to part design workbench, select a face and press the sketch button to map a sketch to it. now make the sketch as before, and when finished just press the pocket button, and it will cut through the body.
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NormandC
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Location: Québec, Canada

Re: Sheet Metal Workbench

Postby NormandC » Fri Mar 10, 2017 2:35 am

Statik wrote:Sheet Metal apparently doesn't like me making cuts to bends. :(

Quite possibly because of this:

FC_Statik_Handle_3_01.png
FC_Statik_Handle_3_01.png (20.71 KiB) Viewed 133 times


Coplanar faces and face tangency between objects used in a Boolean operation is almost always a bad idea. To reduce risk of Boolean failures, take care to ensure the solid cutting the other does not share coplanar faces. In other words, make it extend so you don't see these intersection edges on the end and bottom face of Extrude006.

Nonetheless the cut works here too, and I'm very surprised!

But know that such a cut will make the part impossible to unfold. To ensure a part can be unfolded, the edges along the sheet metal should always be normal to the upper and lower faces of the sheet.

Here's how it should look like:
FC_Statik_Handle_3_02.png
FC_Statik_Handle_3_02.png (20.71 KiB) Viewed 133 times

But this is rather out of the purview of this topic... (FYI I extruded a surface, cut it with a solid similar to your Extrude006 then used Part Offset on the result with "fill offset" option checked to create a 1mm plate. The Flatten tool is not sophisticated enough to unfold this)

OS: Ubuntu 16.04.2 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6707 (Git)
Build type: None
Branch: releases/FreeCAD-0-16
Hash: 5465bc47c95db45e0be85dc0e2872419efadce0f
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17
Attachments
Handle_3_normandc1.fcstd
(301.23 KiB) Downloaded 3 times