Sweep (Part WB) problem

[JussyAD]

But I don't get ANY problems doing the sweep in the Part Design WB. Seamless every time regardless of radius length (be it 0.1, 0.2 etc)....so is it really my hardware or the Part WB tool? Although you got better results than me. I really think there is a bug. Maybe we can bring this to the attention of the developers?

[JussyAD]

I don't want to give up on this great software but I need an explanation and a solution. My graphics card can display the sweep nicely in PartD WB so why is Part WB giving trouble? Attaching the sketch to helix does nothing
I just want everything to work like it should.
Do I need to go to v0.18 or v0.17?

[chrisb]

The developers are aware of this. Since years. The problems come from the third party geometric kernel. FreeCAD could indeed use the same kernel functions in Part and PartDesign, however, your case is an exception of the more frequent case that such sweeps work better in Part workbench, while the PartDesign sweep has more functions.
I guess it is something between the geometric kernel and OpenGL, the latter being dependent from your hardware.

[chrisb]

I opened your file and it looks here the same as in your screenshot.

OS: macOS 10.16
Word size of FreeCAD: 64-bit
Version: 0.20.24720 (Git)
Build type: Release
Branch: master
Hash: 8b0c58d1b45017ad42bf0fa8f827f1cf22a398e7
Python version: 3.9.2
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.1
Locale: C/Default (C)

[jmaustpc]

so is it really my hardware or the Part WB tool?

No, I am suggesting that it is a mixture of the software and an optional setting in the software.

The first examples seemed to just be a visualisation issue that could be fixed by increasing the detail of the visualisation but the last seems to me to be a bug.

Regarding your last file, I tried changing various things but couldn't get the sweep to form a correct solid if the was less than about 0.39mm.

I have created a modified version of your last file to demonstrate the matter. Here is the file...

Sweep_fails_if_profile_is_less_than_0_39.FCStd

(21.47 KiB) Downloaded 16 times

and a screenshot

Screenshot_20210423_101845.png (181.8 KiB) Viewed 558 times

I don't know what is going wrong, but I think this is okay to be written up as a bug.

Jim

OS: Ubuntu 20.04.2 LTS (KDE/plasma)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19. stable PPA
Build type: Release
Branch: unknown
Hash: 9e3b630bbfb6807e93eeffb655e6c20f218644fc
Python version: 3.8.5
Qt version: 5.12.8
Coin version: 4.0.0
OCC version: 7.5.1
Locale: English/Australia (en_AU)

[UR_]

Do I need to go to v0.18 or v0.17?

Not really!

Just correct your helix settings to prevent subdivisions.

Example:

Screenshot 008.png (6.91 KiB) Viewed 541 times

Screenshot 009.png (53.9 KiB) Viewed 541 times

file:

NoDisaster.FCStd

(50.86 KiB) Downloaded 13 times

version:
OS: Windows 10 (10.0)
Word size of FreeCAD: 64-bit
Version: 0.20.24720 (Git)
Build type: Release
Branch: master
Hash: 8b0c58d1b45017ad42bf0fa8f827f1cf22a398e7
Python version: 3.8.8
Qt version: 5.12.9
Coin version: 4.0.0
OCC version: 7.5.1
Locale: German/Germany (de_DE)

[JussyAD]

something between the geometric kernel and OpenGL, the latter being dependent from your hardware.

Makes sense! Thank you for explaining.

~~~~~~~~~~

I don't know what is going wrong, but I think this is okay to be written up as a bug

I am glad to see you got the exact same result there with the incomplete sweep of the solid helix. Definitely should not be happening. Thank you for confirming and your input.

~~~~~~~~~~

Just correct your helix settings to prevent subdivisions

I would but I don't even see the option to edit the segment length. How did you get to that dialogue box? In my combo view I only have Pitch, Height, Radius and Angle.
If this is the solution please show me how you got that field...

[UR_]

If this is the solution please show me how you got that field...

update FreeCAD to at least 0.20.24395

24395
Part primitives: add SegmentLength property to helix and spiral


git commit 97543396c5cf91af3a7911382aa78318765af983


https://github.com/FreeCAD/FreeCAD-Bund ... kly-builds

[JussyAD]

update FreeCAD to at least 0.20.24395

thank you for letting me know but from what I can see the latest update was yesterday and it is 0.19.2 (https://github.com/FreeCAD/FreeCAD/releases/tag/0.19.2).
please send me the link to that version.

[UR_]

weekly builds can be found here:

https://github.com/FreeCAD/FreeCAD-Bund ... kly-builds