Odd Behavior of Assembly Bench with Toroids

[graycad]

Greetings All-

Today I ran into what appears to be an Assembly bench problem of some kind. I don't understand the behavior and hope somebody can explain.

To illustrate, I've created a part with four concentric rings with the following attributes (see first image):

1) (smallest) This was created by clicking the toroid button in the Part Workbench.

2) (next largest) This ring was created by specifying a circular cross section, and then using the Sweep tool in Part Workbench to sweep that circle over a path specified by an arc. The result is an open ring.

3) This ring was also created using a Part Workbench sweep, although this time the sweep patch is a closed circle.

4) The the largest ring was likewise created using a Part Workbench sweep and is also closed. However, in this case the path, while closed, is actually prescribed by two arcs joined to form a circle.

Now comes the problem (see second image):

When create an assembly with the Assembly Workbench and try to import the part just described, two of the toroids vanish. #1 and #3. Why?

rings.jpg (51.76 KiB) Viewed 1070 times

rings-assy.jpg (39.12 KiB) Viewed 1070 times

My Freecad information is as follows:

OS: Linux Mint 18.2 Sonya
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.18.16093 (Git)
Build type: Release
Branch: releases/FreeCAD-0-18
Hash: 690774c0effe4fd7b8d2b5e2fb2b8c8d145e21ce
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/UnitedStates (en_US)

The assembly bench version is 3.16.

I would add, however, that the same behavior is observed on a different 64-bit Mint Linux machine running Assembly Bench version 4.0.

[graycad]

FYI- I just tried another experiment in which I created the toroid by revolving a circle. A toroid of that origin is successfully seen by the Assembly Workbench.

-Graycad

[vocx]

The assembly bench version is 3.16.

Please be very clear about what you are talking about. There is no "Assembly bench". There is no official assembly workbench in fact. There is an Assembly2 workbench, which is no longer developed. There is also a successor to that which is called A2plus, whose version number is 0.4.23.

Which are you using exactly?

[kbwbe]

... version is 3.16.

Hi Graycad,
your A2plus workbench is not up to date. The recent version is 0.4.23.
With this, your part can be imported.