Designing model locomotive kits using Assembly and other workbenches

Discussion about the development of the Assembly workbench.
kcleung
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Designing model locomotive kits using Assembly and other workbenches

Postby kcleung » Tue May 04, 2021 11:09 am

Say if I were to design a part, which comprises of:

* solids that are made by CNC, 3D printing or casting;
* sheetmetal processed by lasercutting, waterjet cutting or photo etching followed by folding; and
* soldering and/or welding of the above parts together to form the finished part

then an assembly of parts by loose, transitional or interference fit.

For solids, obviously I will start with Parts and PartDesign workbenches.

However, for sheetmetal where I design the needed parts, then place the parts onto a sheet for lasercutting or photoetching to get optimal placements, and to simulate folding of the cut parts before assembly, what are the best tools?

Also, in the case of photoetching, one of the common way to easily get folding right is to half-etch along the line to be folded, if the edge radius is so small that it is close to the thickness of the sheetmetal. Then when the part is folded, it tends to fold along that line.

So what is the best workflow to design such an assembly? If we can do this well, then FreeCAD can be a great tool to design kits for model locomotives :)
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jpg87
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Re: Designing model locomotive kits using Assembly and other workbenches

Postby jpg87 » Fri May 07, 2021 10:03 am

kcleung wrote:
Tue May 04, 2021 11:09 am
...
Uh, a lot of things in your post!
No one has dared to answer yet, so I try.
kcleung wrote:
Tue May 04, 2021 11:09 am
For solids, obviously I will start with Parts and PartDesign workbenches.
This is as good as I would, with a preference for PartDesign (very personal).
kcleung wrote:
Tue May 04, 2021 11:09 am
sheetmetal ...
There is Sheetmetal WB, which I have not yet had the opportunity to test.
https://wiki.freecadweb.org/SheetMetal_Workbench

Regarding the assembly WB, there are 3. It is up to you to choose the one that best suits your expectations.
https://wiki.freecadweb.org/A2plus_Workbench
https://wiki.freecadweb.org/Assembly3_Workbench
https://wiki.freecadweb.org/Assembly4_Workbench

Very personal opinion again, I really like working with Assembly 3 WB.
My website : http://help-freecad-jpg87.fr updated 2021/04/23
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bambuko
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Location: UK, England, North Devon

Re: Designing model locomotive kits using Assembly and other workbenches

Postby bambuko » Fri May 07, 2021 11:38 am

kcleung wrote:
Tue May 04, 2021 11:09 am
...
* sheetmetal processed by lasercutting, waterjet cutting or photo etching...
Your design workflow should start by talking to the suppliers (I am assuming you will outsource)
Here an example:
https://www.ppdltd.com/artwork-guide.html

There is a lot more to model photo etch than simply sheetmetal WB in FreeCAD ;)