AdditivePipe along ParametricCurve failing

[Miq58]

Hi,

I am attempting to model a flattened sinoid spring, using the Parametric_Curve_FP macro to generate the spine. Alas, the AdditivePipe always will fail with this error:

2022-01-25 15_06_20-Window.png (13.76 KiB) Viewed 848 times

What am I doing wrong here?

My Freecad version is

Code: Select all

OS: Windows 10 Version 2009
Word size of FreeCAD: 64-bit
Version: 0.20.25645 (Git)
Build type: Release
Branch: master
Hash: 37d9757399b4c2ec30318eb88d7cd7c508246345
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: German/Germany (de_DE)

[domad]

....

Hello, greetings to the community!

Convert the Parametric curve to Sketch (Wb Draft) and transfer it inside the body.
The profile has too large a thickness, this generates intersections in the sweep phase, you can use a thickness of 0.3 mm (keeping 2 mm of height).
Otherwise you have to change the path.

[Miq58]

....

Hello, greetings to the community!

Convert the Parametric curve to Sketch (Wb Draft) and transfer it inside the body.
The profile has too large a thickness, this generates intersections in the sweep phase, you can use a thickness of 0.3 mm (keeping 2 mm of height).
Otherwise you have to change the path.

Thanks a lot, I see the problem. Is there a way to generate an AdditivePipe with a constant width, ignoring the overlaps? I will need a certain constant width to keep the spring element stable - 0.3mm is much too narrow to stand any force.
I tried the method to convert it to a sketch, but I am getting a fenced structure only, no solid, as I had intended:

2022-01-25 16_29_28-Window.png (155.68 KiB) Viewed 785 times

[Miq58]

Wait... Got it better now with a reduced sweeping sketch size. The resulting STL file is HUGE, >57MB. The Cura slicer is able to reduce it again to below 500kB.

Thanks again, I think I can proceed with that now!

[GeneFC]

Since the cross section appears to be rectangular you could create a full cycle in sketcher and then pad it to the desired thickness. Then do a Linear Array on the single cycle as many times as wanted.

The sketch will not present any limits on the shape.

Gene

[Miq58]

Since the cross section appears to be rectangular you could create a full cycle in sketcher and then pad it to the desired thickness. Then do a Linear Array on the single cycle as many times as wanted.

The sketch will not present any limits on the shape.

Gene

That sounds promising - I will give it a try. Thanks!

[domad]

.......

Hello, greetings to the community!

A somewhat different attempt based on what @GeneFC said.
It can certainly be improved and it is possible to model it to very precise dimensions for any simulations of stresses with the "FEM" Wb.

[Miq58]

Excellent! This again is worth a try!